Medicine:Hereditary haemochromatosis

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Haemochromatosis type 1
Other namesHFE hereditary haemochromatosis[1] HFE-related hereditary haemochromatosis[2]
Hemochromatosis liver iron prussian blue.jpg
Iron accumulation demonstrated by Prussian blue staining in a patient with homozygous genetic haemochromatosis (microscopy, 10x magnified): Parts of normal pink tissue are scarcely present.
Differential diagnosisHaemochromatosis type 2, 3, 4, and 5. Secondary haemochromatosis. Aceruloplasminemia. Atransferrinemia

Hereditary haemochromatosis type 1 (HFE-related Hemochromatosis)[3] is a genetic disorder characterized by excessive intestinal absorption of dietary iron, resulting in a pathological increase in total body iron stores.[4] Humans, like most animals, have no mechanism to regulate excess iron, simply losing a limited amount through various means like sweating or menstruating[5][6][7]

Excess iron accumulates in tissues and organs, disrupting their normal function. The most susceptible organs include the liver, heart, pancreas, skin, joints, gonads, thyroid and pituitary gland; patients can present with cirrhosis, polyarthropathy, hypogonadism, heart failure, or diabetes.[8]


There are five types of hereditary hemochromatosis: type 1, 2 (2A, 2B), 3, 4[9] and 5,[10] all caused by mutated genes. Hereditary hemochromatosis type 1 is the most frequent, and unique related to the HFE gene. It is most common among those of Northern European ancestry, in particular those of Celtic descent.[11]

The disease follows an autosomal recessive pattern of inheritance, meaning that an individual must inherit two copies of the mutated gene involved in each cell to develop the condition.[12] In most cases, when a person has this autosomal recessive condition, their parents act as carriers. Carriers possess one copy of the mutated gene but do not manifest any signs or symptoms associated with the disease, and are referred to as carriers. The unaffected carrier parents play an integral role in transmitting one copy of the mutated gene to their child, who ultimately develops the disease. However, carriers may experience iron overload themselves at a later stage if certain factors come into play. Still, in most cases, they remain asymptomatic throughout their lives unless other genetic or environmental factors contribute to excessive iron accumulation within their bodies.[12]

Signs and symptoms

Haemochromatosis is protean in its manifestations, i.e., often presenting with signs or symptoms suggestive of other diagnoses that affect specific organ systems. Many of the signs and symptoms below are uncommon, and most patients with the hereditary form of haemochromatosis do not show any overt signs of disease nor do they have premature morbidity, if they are diagnosed early, but, more often than not, the condition is diagnosed only at autopsy.[13]

Presently, the classic triad of cirrhosis, bronze skin, and diabetes is less common because of earlier diagnosis.[14]

The more common clinical manifestations include:[8][14][15][16]

Less common findings including:

In the hereditary hemochromatosis (HH or HHC), males are usually diagnosed after their forties and fifties, and women some decades later, during menopause. The severity of clinical disease varies considerably. Some evidence suggests that hereditary haemochromatosis patients affected with other liver ailments such as hepatitis or alcoholic liver disease have worse liver disease than those with either condition alone. Also, juvenile form of primary haemochromatosis (Hemochromatosis type 2) present in childhood with the same consequences of iron overload.[citation needed]

End-organ damage

Iron is stored in the liver, pancreas and heart. Long-term effects of haemochromatosis on these organs can be serious, even fatal when untreated.[22]

Since the liver is a primary storage area for iron and naturally accumulates excess iron over time, it is likely to be damaged by iron overload. Toxins may accumulate in the blood and eventually affect mental functioning due to increased risk of hepatic encephalopathy. Together, they can increase the risk of liver cancer to one in three persons.

If excess iron in the heart interferes with its ability to circulate enough blood, a number of problems can occur, including (potentially fatal) congestive heart failure. The condition may be reversible when haemochromatosis is treated and excess iron stores are reduced. Arrhythmia or abnormal heart rhythm can cause heart palpitations, chest pain, and light-headedness, and is occasionally life-threatening. This condition can often be reversed with treatment.[citation needed]

The pancreas, which also stores iron, is very important in the body's mechanisms for sugar metabolism. Diabetes affects the way the body uses blood sugar (glucose), and diabetes is, in turn, the leading cause of new blindness in adults and may be involved in kidney failure.[citation needed]

Haemochromatosis may lead to cirrhosis and its complications, including bleeding from dilated veins in the esophagus (esophageal varices) and stomach (gastric varices) and severe fluid retention in the abdomen (ascites). Severity of periodontal disease is associated with high transferrin saturation in haemochromatosis patients.[23][24]

Genetics

The regulation of dietary iron absorption is complex and understanding is incomplete. One of the better-characterized genes responsible for hereditary haemochromatosis is HFE[25] on chromosome 6, which codes for a transmembrane protein involved in the induction of hepcidin expression upon high iron load. The HFE gene has three often observed genetic variants:[26][27]

  • rs1799945, c.187C>G, p.His63Asp (H63D);
  • rs1800562, c.845G>A, p. Cys282Tyr (C282Y);
  • rs1800730, c.193A>T, p.Ser65Cys (S65C).

The worldwide prevalence rates for H63D, C282Y and S65C (minor allele frequencies) are 10%, 3% and 1% respectively.[28][29][30]

The C282Y allele is a transition point mutation from guanine to adenine at nucleotide 845 in HFE, resulting in a missense mutation that replaces the cysteine residue at position 282 with a tyrosine amino acid.[31] Heterozygotes for either allele can manifest clinical iron overload, if they have two of any alleles. This makes them compound heterozygous for haemochromatosis and puts them greatly at risk of storing excess iron in the body.[32][33][34][35] Homozygosity for the C282Y genetic variant is the most common genotype responsible for clinical iron accumulation, though heterozygosity for C282Y/H63D variants, so-called compound heterozygotes, results in clinically evident iron overload.[36] Considerable debate exists regarding the penetrance—the probability of clinical expression of the trait given the genotype— for clinical disease in homozygotes.[37] Most males homozygous for HFE C282Y show at least one manifestation of iron-storage disease by middle age.[38] Individuals with the relevant genetic variants may never develop iron overload. Phenotypic expression is present in 70% of C282Y homozygotes with less than 10% going on to experience severe iron overload and organ damage.[39]

The H63D variant is just a gene polymorphism, and if there are no other changes, it may not have clinical significance.[40][41][42] In a 2014 study, H63D homozygosity was associated with an elevated mean ferritin level, but only 6.7% had documented iron overload at follow-up.[43] As about the people with one copy of the H63D alteration (heterozygous carriers), this genotype is very unlikely to cause a clinical presentation, there is no predictable risk of iron overload.[44] Besides that, two 2020 studies revealed that the frequency of homozygous or heterozygous H63D variant is significantly higher in elite endurance athletes comparing to ethnically matched controls, and is associated with high V̇O2max in male athletes.[45][46]

See also: HFE H63D gene mutation

Each patient with the susceptible genotype accumulates iron at different rates depending on iron intake, the exact nature of the genetic variant, and the presence of other insults to the liver, such as alcohol and viral disease. As such, the degree to which the liver and other organs are affected is highly variable and is dependent on these factors and co-morbidities, as well as age at which they are studied for manifestations of disease.[47] Penetrance differs between populations.

Disease-causing genetic variants of the HFE gene account for 90% of the cases of non-transfusion iron overload.

This gene is closely linked to the HLA-A3 locus.[citation needed]

Pathophysiology

The normal distribution of body iron stores

Since the regulation of iron metabolism is still poorly understood, a clear model of how haemochromatosis operates is still not available. A working model describes the defect in the HFE gene, where a mutation puts the intestinal absorption of iron into overdrive. Normally, HFE facilitates the binding of transferrin, which is iron's carrier protein in the blood. Transferrin levels are typically elevated at times of iron depletion (low ferritin stimulates the release of transferrin from the liver). When transferrin is high, HFE works to increase the intestinal release of iron into the blood. When HFE is mutated, the intestines perpetually interpret a strong transferrin signal as if the body were deficient in iron. This leads to maximal iron absorption from ingested foods and iron overload in the tissues. However, HFE is only part of the story, since many patients with mutated HFE do not manifest clinical iron overload, and some patients with iron overload have a normal HFE genotype. A possible explanation is the fact that HFE normally plays a role in the production of hepcidin in the liver, a function that is impaired in HFE mutations.[48]

People with abnormal iron regulatory genes do not reduce their absorption of iron in response to increased iron levels in the body. Thus, the iron stores of the body increase. As they increase, the iron which is initially stored as ferritin is deposited in organs as haemosiderin and this is toxic to tissue, probably at least partially by inducing oxidative stress.[49] Iron is a pro-oxidant. Thus, haemochromatosis shares common symptomology (e.g., cirrhosis and dyskinetic symptoms) with other "pro-oxidant" diseases such as Wilson's disease, chronic manganese poisoning, and hyperuricaemic syndrome in Dalmatian dogs. The latter also experience "bronzing".[citation needed]

Diagnosis

The diagnosis of haemochromatosis is often made following the incidental finding on routine blood screening of elevated serum liver enzymes or elevation of the transferrin saturation or elevated serum ferritin. Arthropathy with stiff joints, diabetes, or fatigue, may be the presenting complaint.[50]

Blood tests

Serum ferritin and fasting transferrin saturation are commonly used as screening for haemochromatosis. Transferrin binds iron and is responsible for iron transport in the blood.[51] Measuring ferritin provides a crude measure of iron stores in the body. Fasting transferrin saturation values in excess of 45%, and the serum ferritin more than 250 ug/L in males and 200 ug/L in females are recognized as a threshold for further evaluation of haemochromatosis.[52] Other source says that the normal values for males are 12-300 ng/mL and for female, 12-150 ng/mL.[53] Fasting transferrin saturation is a better test to detect HH.[14][54] Transferrin saturation greater than 62% is suggestive of homozygosity for mutations in the HFE gene.[55]

Ferritin, a protein synthesized by the liver, is the primary form of iron storage within cells and tissues. Measuring ferritin provides a crude estimate of whole-body iron stores, though is raised in many conditions, particularly inflammatory conditions. Examples of causes for raised serum ferritin include but are not limited to: infection, chronic alcohol consumption (mainly >20g/day), liver disease, cancer, porphyria, Hemophagocytic lymphohistiocytosis, hyperthyroidism, obesity, metabolic syndrome, diabetes, several blood transfusions, too many iron supplements, aceruloplasminemia, atransferrinemia, hyperferritinemia cataract syndrome and others. Proinflammatory states account for up to 90% of raised ferritin.[56][57][4] Serum ferritin in excess of 1000 ng/mL of blood is almost always attributable to haemochromatosis.[citation needed]

Other blood tests routinely performed include blood count, renal function, liver enzymes, electrolytes, and glucose (and/or an oral glucose tolerance test).[citation needed]

Liver biopsy

Liver biopsies involve taking a sample of tissue from the liver, using a thin needle. The amount of iron in the sample is then quantified and compared to normal, and evidence of liver damage, especially cirrhosis, is measured microscopically. Formerly, this was the only way to confirm a diagnosis of haemochromatosis, but measures of transferrin and ferritin along with a history are considered adequate in determining the presence of the malady. Risks of biopsy include bruising, bleeding, and infection. Now, when a history and measures of transferrin or ferritin point to haemochromatosis, whether a liver biopsy is still necessary to quantify the amount of accumulated iron is debatable.[50]

MRI

MRI-based testing is a noninvasive and accurate alternative to measure liver iron concentrations.[58]

Other imaging

Clinically, the disease may be silent, but characteristic radiological features may point to the diagnosis. The increased iron stores in the organs involved, especially in the liver and pancreas, result in characteristic findings on unenhanced CT and a decreased signal intensity in MRI scans. Haemochromatosis arthropathy includes degenerative osteoarthritis and chondrocalcinosis. The distribution of the arthropathy is distinctive, but not unique, frequently affecting the second and third metacarpophalangeal joints of the hand.[59] The arthropathy can, therefore, be an early clue as to the diagnosis of haemochromatosis.[citation needed]

Functional testing

Based on the history, a physician might consider specific tests to monitor organ dysfunction, such as an echocardiogram for heart failure, or blood glucose monitoring for patients with haemochromatosis diabetes.[citation needed]

Stages

The American Association for the Study of Liver Diseases suggests the following three stages for the condition (identified by the European Association for the Study of Liver Diseases):[39]

  1. Genetic susceptibility but no iron overload. Individuals who have the genetic disorder only.
  2. Iron overload but no organ or tissue damage.
  3. Organ or tissue damage as a result of iron deposition.

Individuals at each stage do not necessarily progress on to the next stage, and end stage disease is more common in males.

Differential diagnosis

Other causes of excess iron accumulation exist, which have to be considered before haemochromatosis type 1 is diagnosed.

Screening

Standard diagnostic measures for haemochromatosis, transferrin saturation and ferritin tests, are not a part of routine medical testing. Screening for haemochromatosis is recommended if the patient has a parent, child, or sibling with the disease.[61]

Routine screening of the general population for hereditary haemochromatosis is generally not done. Mass genetic screening has been evaluated by the U.S. Preventive Services Task Force, among other groups, which recommended against genetic screening of the general population for hereditary haemochromatosis because the likelihood of discovering an undiagnosed patient with clinically relevant iron overload is less than one in 1,000. Although strong evidence shows that treatment of iron overload can save lives in patients with transfusional iron overload, no clinical study has shown that for asymptomatic carriers of hereditary haemochromatosis treatment with venesection (phlebotomy) provides any clinical benefit.[62][63] Recently, patients are suggested to be screened for iron overload using serum ferritin as a marker. If serum ferritin exceeds 1000 ng/mL, iron overload is very likely the cause.

Treatment

Phlebotomy

Early diagnosis is vital, as the late effects of iron accumulation can be wholly prevented by periodic phlebotomies (by venesection) comparable in volume to blood donations.[64][65]

Phlebotomy (or bloodletting) is usually done at a weekly or each two weeks interval until ferritin levels are 50 μg/L or less. To prevent iron reaccumulation, subsequent phlebotomies are normally carried out about once every three to four months for males, and twice a year for females to keep the serum ferritin between 50 and 100 ug/L[66]

Iron chelation therapy

Where venesection is not possible, long-term administration of an iron chelator as Deferoxamine (or Desferrioxamine), Deferasirox and Deferiprone is useful. Deferoxamine is an iron-chelating compound, and excretion induced by deferoxamine is enhanced by administration of vitamin C. It cannot be used during pregnancy or breast-feeding due to risk of defects in the child.[citation needed]

Organ damage

Diet

Diet can be a powerful but understudied tool in prevention of iron overload. Especially in the Western world where many foods are fortified and animal protein is relatively convenient and inexpensive, it is very common for people to eat more than the Recommended Dietary Allowance of iron even in a single meal. For example, one serving of several popular cereals has more than two times the RDA of iron for a man or non menstruating woman. Menstruating women have roughly twice the iron requirements of a man or non menstruating woman due to monthly loss of blood.

  • Limiting intake of alcoholic beverages, high iron fortified foods such as certain cereals and supplements, vitamin C (increases iron absorption in the gut), red meat (high in iron), and potential causes of food poisoning (shellfish, raw seafood)[67]
  • Increasing intake of substances that inhibit iron absorption, such as high-tannin tea, calcium, and foods containing oxalic and phytic acids (such as collard greens, which must be consumed at the same time as the iron-containing foods to be effective)[citation needed]

Chelating polymers

A novel experimental approach to the hereditary haemochromatosis treatment is the maintenance therapy with polymeric chelators.[68][69][70] These polymers or particles have a negligible or null systemic biological availability and they are designed to form stable complexes with Fe2+ and Fe3+ in the GIT and thus limiting the uptake of these ions and their long-term accumulation. Although this method has only a limited efficacy, unlike small-molecular chelators, such an approach has virtually no side effects in sub-chronic studies.[70] Interestingly, the simultaneous chelation of Fe2+ and Fe3+ increases the treatment efficacy.[70]

Prognosis

Persons with symptomatic haemochromatosis have somewhat reduced life expectancy compared to the general population, mainly due to excess mortality from cirrhosis and liver cancer. Patients who were treated with phlebotomy lived longer than those who were not.[71][72] Patients without liver disease or diabetes had similar survival rate to the general population.

Epidemiology

Haemochromatosis is one of the most common heritable genetic conditions in people of Northern Europe, with a prevalence of 1:200.[73] The disease has a variable penetration, and about one in 10 people of this demographic carry a mutation in one of the genes regulating iron metabolism.[74] In the U.S., the frequency of the C282Y and H63D mutations is 5.4% and 13.5%, respectively. Whereas, the worldwide frequency of the C282Y and H63D mutations is about 1.9% and 8.1%, respectively, so mutation in H63D allele are more than C282Y allele.[73] The prevalence of mutations in iron-metabolism genes varies in different populations. A study of 3,011 unrelated white Australians found that 14% were heterozygous carriers of an HFE mutation, 0.5% were homozygous for an HFE mutation, and only 0.25% of the study population had clinically relevant iron overload. Most patients who are homozygous for HFE mutations do not manifest clinically relevant haemochromatosis (see Genetics above).[47] Other populations have a lower prevalence of both the genetic mutation and the clinical disease. It is the most frequent genetic disease in the U.S. with a prevalence of 1:300 in the non-Hispanic white population,[8][75] It is 2-3 times more common in males.[9]

Genetics studies suggest the original haemochromatosis mutation arose in a single person, possibly of Celtic ethnicity, who lived 60–70 generations ago.[76] At that time, when dietary iron may have been scarcer than today, the presence of the mutant allele may have provided an evolutionary advantage by maintaining higher iron levels in the blood.[citation needed]

The distribution of the C282Y variant was noted in various countries. Non-HFE associated hemochromatosis, as Haemochromatosis type 2, Haemochromatosis type 3, Haemochromatosis type 4 and Haemochromatosis type 5,[10] were discovered in Mediterranean countries. On the other side, Northern European ancestry is closely linked to hereditary hemochromatosis disease (HFE). In one study, over 93% of Irish patients with HFE C282Y mutation were homozygotic. The G320V mutation in the HJV gene, which produces hemojuvelin protein, is widely distributed in central Europe and Greece.[73]

Terminology

The term "haemochromatosis" is used by different sources in many different ways.

It is often used to imply an association with the HFE gene. For many years, HFE was the only known gene associated with haemochromatosis, and the term "hereditary haemochromatosis" was used to describe haemochromatosis type 1. However, many different genetic associations with this condition are now known. The older the text, or the more general the audience, the more likely that HFE is implied. "Haemochromatosis" has also been used in contexts where a genetic cause for iron accumulation had not been known. In some cases, however, a condition that was thought to be due to diet or environment was later linked to a genetic polymorphism, as in African iron overload.[citation needed]

History

In 1847, Virchow described a golden brown granular pigment that was soluble in sulfuric acid and produced red ash on ignition.[77] The disease was first described in 1865 by Armand Trousseau in a report on diabetes in patients presenting with a bronze pigmentation of their skin.[78] Two years later, Perls developed the first practical method for the analysis of iron in tissue. Despite Trousseau not associating diabetes with iron accumulation, the recognition that infiltration of the pancreas with iron might disrupt endocrine function resulting in diabetes was made by Friedrich Daniel von Recklinghausen in 1890.[79][80] In 1935, English gerontologist Joseph Sheldon described the cases of haemochromatosis. He established this as the name of the disorder and his detailed monograph. Despite lacking the modern molecular techniques accessible today, he came to accurate conclusions that describe haemochromatosis disease as an inborn error of metabolism where this inherited disorder can increase the absorption of iron and thus cause tissue damage due to iron deposition. Moreover, he rejected theories that alcohol, drug, and other factors contribute to the disorder.[81][82][83]

The clinical case series from 1935 to 1955 indicated that haemochromatosis was more common than had been acknowledged.[77] During the 1960s, MacDonald, a pathologist at Boston City Hospital, diverted attention away from the true cause of haemochromatosis. He believed that haemochromatosis was a nutritional condition because he observed many drunken patients of Irish ancestry.[84] During this period of time, other investigators reported additional evidence suggesting that a genetic factor could play a central role in the absorption of iron in people with haemochromatosis. However, alcohol consumption is known to increase the risk of liver injury in haemochromatosis. This finding is consistent with the concept that excess iron metabolism is a primary cause of haemochromatosis disease.[82]

Finally, in 1976, Marcel Simon and his collaborators confirmed that haemochromatosis is an autosomal recessive disorder that has a link to the human leukocyte antigen (HLA) region of the genome. It took 20 years for researchers at Mercator Genetics to effectively identify and clone the haemochromatosis genes using a positional cloning approach.[85]

In 1996, Feder et al. identified HFE, which is a major histocompatibility complex (MHC) gene. They found that 83% of patients have homozygosity for a missense mutation (C282Y) in the HFE gene.[31][82][83] Finally, several groups reported their findings in a series of patients with haemmochromatosis where they discovered the existence of the C282Y mutation in about 85-90% of the cases. The discovery has led to improved clinical medicine and liver disease evaluation.[82]

References

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  2. ↑ "Changing aspects of HFE-related hereditary haemochromatosis and endeavours to early diagnosis". Neth J Med 65 (11): 419–24. December 2007. PMID 18079564. http://www.zuidencomm.nl/njm/getarticle.php?v=65&i=11&p=419. 
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  7. ↑ Ofojekwu, Mary-Jane N.; Nnanna, Ogbonnaya U.; Okolie, Charles E.; Odewumi, Lolade A.; Isiguzoro, Ikechukwu O. U.; Lugos, Moses. D. (2013). "Hemoglobin and Serum Iron Concentrations in Menstruating Nulliparous Women in Jos, Nigeria". Laboratory Medicine 44 (2): 121–124. doi:10.1309/LMM7A0F0QBXEYSSI. 
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  12. ↑ 12.0 12.1 Reference, Genetics Home. "Hereditary hemochromatosis". https://ghr.nlm.nih.gov/condition/hereditary-hemochromatosis. 
  13. ↑ Hemochromatosis-Diagnosis National Digestive Diseases Information Clearinghouse, National Institutes of Health, U.S. Department of Health and Human Services
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  15. ↑ Hemochromatosis National Digestive Diseases Information Clearinghouse, National Institutes of Health, U.S. Department of Health and Human Services
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  17. ↑ 17.0 17.1 "Idiopathic hemochromatosis (IHC): dementia and ataxia as presenting signs". Neurology 33 (11): 1479–83. 1983. doi:10.1212/WNL.33.11.1479. PMID 6685241. 
  18. ↑ "Concurrent hereditary haemochromatosis and idiopathic Parkinson's disease: a case report series". J Neurol Neurosurg Psychiatry 75 (4): 631–3. 2004. doi:10.1136/jnnp.2003.027441. PMID 15026513. 
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  20. ↑ "Hemochromatosis and Vibrio vulnificus Wound Infections". J. Clin. Gastroenterol. 43 (9): 890–893. April 2009. doi:10.1097/MCG.0b013e31819069c1. PMID 19349902. 
  21. ↑ "Serum transferrin saturation increase is associated with decrease of antibacterial activity of serum in patients with HFE-related genetic hemochromatosis". Am. J. Gastroenterol. 103 (10): 2502–8. October 2008. doi:10.1111/j.1572-0241.2008.02036.x. PMID 18684194. 
  22. ↑ "Hemochromatosis: Complications". Mayo Foundation for Medical Education and Research (MFMER). http://www.mayoclinic.com/health/hemochromatosis/DS00455/DSECTION=6. 
  23. ↑ Meuric, Vincent; Lainé, Fabrice; Boyer, Emile; Le Gall-David, Sandrine; Oger, Emmanuel; Bourgeois, Denis; Bouchard, Philippe; Bardou-Jacquet, Edouard et al. (September 2017). "Periodontal status and serum biomarker levels in HFE haemochromatosis patients. A case-series study". Journal of Clinical Periodontology 44 (9): 892–897. doi:10.1111/jcpe.12760. PMID 28586532. https://hal-univ-rennes1.archives-ouvertes.fr/hal-01614700/file/Meuric%20et%20al.%20-%20Periodontal%20status%20and%20serum%20biomarker%20levels%20in%20H.pdf. 
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  27. ↑ "HGVS Recommendations for the Description of Sequence Variants: 2016 Update". Human Mutation 37 (6): 564–9. June 2016. doi:10.1002/humu.22981. PMID 26931183. 
  28. ↑ "Reference SNP (rs) Report rs1799945 Allele Frequency". National Center for Biotechnology Information. https://www.ncbi.nlm.nih.gov/snp/rs1799945#frequency_tab. 
  29. ↑ "Reference SNP (rs) Report rs1800562 Allele Frequency". National Center for Biotechnology Information. https://www.ncbi.nlm.nih.gov/snp/rs1800562#frequency_tab. 
  30. ↑ "Reference SNP (rs) Report rs1800730 Allele Frequency". National Center for Biotechnology Information. https://www.ncbi.nlm.nih.gov/snp/rs1800730#frequency_tab. 
  31. ↑ 31.0 31.1 "A novel MHC class I-like gene is mutated in patients with hereditary haemochromatosis". Nature Genetics 13 (4): 399–408. 1996. doi:10.1038/ng0896-399. PMID 8696333. 
  32. ↑ "Effects of C282Y, H63D, and S65C HFE gene mutations, diet, and life-style factors on iron status in a general Mediterranean population from Tarragona, Spain". Ann Hematol 89 (8): 767–73. August 2010. doi:10.1007/s00277-010-0901-9. PMID 20107990. 
  33. ↑ "Prevalence of H63D, S65C, and C282Y hereditary hemochromatosis gene variants in Madeira Island (Portugal)". Ann Hematol 90 (1): 29–32. January 2011. doi:10.1007/s00277-010-1034-x. PMID 20714725. 
  34. ↑ "[The comparison of three molecular genetic techniques for identifying major mutations in gene HFE related to development of inherent hemochromatosis.]" (in Russian). Klin Lab Diagn 61 (5): 316–320. 2016. doi:10.18821/0869-2084-2016-61-5-316-320. PMID 31529915. 
  35. ↑ "Role of HFE gene mutations on developing iron overload in beta-thalassaemia carriers in Egypt". East Mediterr Health J 17 (6): 546–51. June 2011. doi:10.26719/2011.17.6.546. PMID 21796974. 
  36. ↑ "Iron overload disorders". Hepatol Commun 6 (8): 1842–1854. June 2022. doi:10.1002/hep4.2012. PMID 35699322. 
  37. ↑ "Where genotype is not predictive of phenotype: towards an understanding of the molecular basis of reduced penetrance in human inherited disease". Hum Genet 132 (10): 1077–130. October 2013. doi:10.1007/s00439-013-1331-2. PMID 23820649. 
  38. ↑ David A. Warrell; Edward J. Benz Jr.; Timothy M. Cox; John D. Firth (2003). Oxford Textbook of Medicine. 1. Oxford University Press. p. 92. ISBN 978-0-19-262922-7. https://books.google.com/books?id=_s65U1n9Lf8C&q=C282Y+homozygous&pg=RA1-PA92. "Most patients with the disease develop symptoms at, or above, the age of 40 years. [...] Most middle-aged male C282Y homozygous appear to express at least one clinical manifestation of iron-storage disease." 
  39. ↑ 39.0 39.1 Bacon, Bruce R.; Adams, Paul C.; Kowdley, Kris V.; Powell, Lawrie W.; Tavill, Anthony S. (July 2011). "Diagnosis and management of hemochromatosis: 2011 Practice Guideline by the American Association for the Study of Liver Diseases". Hepatology 54 (1): 328–343. doi:10.1002/hep.24330. PMID 21452290. 
  40. ↑ "HFE genotype in patients with hemochromatosis and other liver diseases". Annals of Internal Medicine 130 (12): 953–62. June 1999. doi:10.7326/0003-4819-130-12-199906150-00002. PMID 10383365. 
  41. ↑ "A population-based study of the biochemical and clinical expression of the H63D hemochromatosis mutation". Gastroenterology 122 (3): 646–51. March 2002. doi:10.1016/s0016-5085(02)80116-0. PMID 11874997. 
  42. ↑ "HFE mutations, iron deficiency and overload in 10,500 blood donors". British Journal of Haematology 114 (2): 474–84. August 2001. doi:10.1046/j.1365-2141.2001.02949.x. PMID 11529872. 
  43. ↑ "Iron overload is rare in patients homozygous for the H63D mutation". Canadian Journal of Gastroenterology & Hepatology 28 (4): 198–202. April 2014. doi:10.1155/2014/468521. PMID 24729993. 
  44. ↑ "Heterozygous for p.H63D". http://live.nhsggc.org.uk/about-us/professional-support-sites/west-of-scotland-genetic-services/clinical-genetics/haemochromatosis/heterozygous-for-ph63d/. 
  45. ↑ "The association of HFE gene H63D polymorphism with endurance athlete status and aerobic capacity: novel findings and a meta-analysis". European Journal of Applied Physiology 120 (3): 665–673. March 2020. doi:10.1007/s00421-020-04306-8. PMID 31970519. 
  46. ↑ "HFE Genotype and Endurance Performance in Competitive Male Athletes". Medicine and Science in Sports and Exercise 53 (7): 1385–1390. December 2020. doi:10.1249/MSS.0000000000002595. PMID 33433155. 
  47. ↑ 47.0 47.1 "A population-based study of the clinical expression of the hemochromatosis gene". N Engl J Med 341 (10): 718–24. 1999. doi:10.1056/NEJM199909023411002. PMID 10471457. http://researchrepository.murdoch.edu.au/id/eprint/18788/1/population_based_study.pdf. 
  48. ↑ "Hfe acts in hepatocytes to prevent hemochromatosis". Cell Metab. 7 (2): 173–8. 2008. doi:10.1016/j.cmet.2007.11.014. PMID 18249176. 
  49. ↑ "Oxidative stress in asymptomatic subjects with hereditary hemochromatosis". Am J Hematol 82 (3): 249–50. 2007. doi:10.1002/ajh.20743. PMID 16955456. 
  50. ↑ 50.0 50.1 "Hemochromatosis: Tests and diagnosis". Mayo Foundation for Medical Education and Research (MFMER). http://www.mayoclinic.com/health/hemochromatosis/DS00455/DSECTION=tests-and-diagnosis. 
  51. ↑ "Iron Transport and Cellular Uptake: Transferrin/Iron Physiology". http://sickle.bwh.harvard.edu/iron_transport.html. 
  52. ↑ "Hereditary Hemochromatosis - Hematology and Oncology". https://www.merckmanuals.com/professional/hematology-and-oncology/iron-overload/hereditary-hemochromatosis?query=hemochromatosis. 
  53. ↑ MedlinePlus Encyclopedia Ferritin Test
  54. ↑ "Hemochromatosis and iron-overload screening in a racially diverse population". The New England Journal of Medicine 352 (17): 1769–1778. 28 April 2005. doi:10.1056/nejmoa041534. PMID 15858186. http://www.escholarship.org/uc/item/4pt636cn. 
  55. ↑ "Hereditary hemochromatosis. Analysis of laboratory expression of the disease by genotype in 18 pedigrees". American Journal of Clinical Pathology 78 (2): 196–207. August 1982. doi:10.1093/ajcp/78.2.196. PMID 7102818. 
  56. ↑ "Ferritin test - Mayo Clinic". https://mayoclinic.org/test-procedures/ferritin-test/about/pac-20384928. 
  57. ↑ https://webmd.com/a-to-z-guides/ferritin-blood-test. Reviewed 21 May 2021.
  58. ↑ St Pierre; Clark, PR; Chua-Anusorn, W; Fleming, AJ; Jeffrey, GP; Olynyk, JK; Pootrakul, P; Robins, E et al. (2005). "Non-invasive measurement and imaging of liver iron concentrations using proton magnetic resonance". Blood 105 (2): 855–61. doi:10.1182/blood-2004-01-0177. PMID 15256427. 
  59. ↑ Hirsch, J. H.; Killien, F. C.; Troupin, R. H. (March 1976). "The arthropathy of hemochromatosis". Radiology 118 (3): 591–596. doi:10.1148/118.3.591. ISSN 0033-8419. PMID 175396. 
  60. ↑ "Iron overload in Africans and African-Americans and a common mutation in the SCL40A1 (ferroportin 1) gene". Blood Cells Mol Dis 31 (3): 299–304. 2003. doi:10.1016/S1079-9796(03)00164-5. PMID 14636642. 
  61. ↑ "Summaries for patients. Screening for hereditary hemochromatosis: recommendations from the American College of Physicians". Ann. Intern. Med. 143 (7): I-46. 2005. doi:10.7326/0003-4819-143-7-200510040-00004. PMID 16204158. http://www.annals.org/cgi/content/full/143/7/I-46. 
  62. ↑ U.S. Preventive Services Task Force (2006). "Screening for haemochromatosis: recommendation statement". Ann. Intern. Med. 145 (3): 204–8. doi:10.7326/0003-4819-145-3-200608010-00008. PMID 16880462. 
  63. ↑ Screening for Hemochromatosis U.S. Preventive Services Task Force (2006). Summary of Screening Recommendations and Supporting Documents. Retrieved 18 March 2007
  64. ↑ "Hemochromatosis: Treatments and drugs". Mayo Foundation for Medical Education and Research (MFMER). http://www.mayoclinic.com/health/hemochromatosis/DS00455/DSECTION=7. 
  65. ↑ European Association For The Study Of The Liver. (2010). "EASL clinical practice guidelines for HFE hemochromatosis". Journal of Hepatology 53 (1): 3–22. doi:10.1016/j.jhep.2010.03.001. PMID 20471131. http://www.journal-of-hepatology.eu/article/S0168-8278%2810%2900197-2/abstract?cc=y=. 
  66. ↑ Kowdley, KV; Bennett, RL; Motulsky, AG; Pagon, RA; Adam, MP; Ardinger, HH; Wallace, SE; Amemiya, A et al. (1993). "HFE Hemochromatosis". HFE-Associated Hereditary Hemochromatosis. University of Washington, Seattle. https://www.ncbi.nlm.nih.gov/books/NBK1440/. Retrieved 25 May 2015. 
  67. ↑ Plaut, David; McLellan, William (2009). "Hereditary hemochromatosis". Journal of Continuing Education Topics & Issues 11 (1). http://www.freepatentsonline.com/article/Journal-Continuing-Education-Topics-Issues/193344102.html. Retrieved 11 October 2016. 
  68. ↑ Polomoscanik, Steven C.; Cannon, C. Pat; Neenan, Thomas X.; Holmes-Farley, S. Randall; Mandeville, W. Harry; Dhal, Pradeep K. (November 2005). "Hydroxamic Acid-Containing Hydrogels for Nonabsorbed Iron Chelation Therapy: Synthesis, Characterization, and Biological Evaluation". Biomacromolecules 6 (6): 2946–2953. doi:10.1021/bm050036p. PMID 16283713. 
  69. ↑ Qian, Jian; Sullivan, Bradley P.; Peterson, Samuel J.; Berkland, Cory (18 April 2017). "Nonabsorbable Iron Binding Polymers Prevent Dietary Iron Absorption for the Treatment of Iron Overload". ACS Macro Letters 6 (4): 350–353. doi:10.1021/acsmacrolett.6b00945. PMID 35610854. 
  70. ↑ 70.0 70.1 70.2 Groborz, Ondřej; Poláková, Lenka; Kolouchová, Kristýna; Švec, Pavel; Loukotová, Lenka; Miriyala, Vijay Madhav; Francová, Pavla; Kučka, Jan et al. (December 2020). "Chelating Polymers for Hereditary Hemochromatosis Treatment". Macromolecular Bioscience 20 (12): 2000254. doi:10.1002/mabi.202000254. PMID 32954629. 
  71. ↑ Niederau, Claus; Fischer, Rudolf; Sonnenberg, Amnon; Stremmel, Wolfgang; Trampisch, Hans J.; Strohmeyer, Georg (14 November 1985). "Survival and Causes of Death in Cirrhotic and in Noncirrhotic Patients with Primary Hemochromatosis". New England Journal of Medicine 313 (20): 1256–1262. doi:10.1056/NEJM198511143132004. PMID 4058506. 
  72. ↑ Bokhoven, M. A. v.; Deursen, C. T. B. M. v.; Swinkels, D. W. (19 January 2011). "Diagnosis and management of hereditary haemochromatosis". BMJ 342 (jan19 2): c7251. doi:10.1136/bmj.c7251. PMID 21248018. https://cris.maastrichtuniversity.nl/en/publications/6cfcc947-9f81-44ec-8bc4-a8f18a5c32ed. 
  73. ↑ 73.0 73.1 73.2 Hemochromatosis. 14 June 2021. https://emedicine.medscape.com/article/177216-overview#a6. 
  74. ↑ "Non-classical hereditary hemochromatosis in Portugal: novel mutations identified in iron metabolism-related genes". Ann. Hematol. 88 (3): 229–34. March 2009. doi:10.1007/s00277-008-0572-y. PMID 18762941. https://hal.archives-ouvertes.fr/hal-00477968/file/PEER_stage2_10.1007%252Fs00277-008-0572-y.pdf. 
  75. ↑ McLaren, Gordon D.; Gordeuk, Victor R. (January 2009). "Hereditary hemochromatosis: insights from the Hemochromatosis and Iron Overload Screening (HEIRS) Study". Hematology 2009 (1): 195–206. doi:10.1182/asheducation-2009.1.195. PMID 20008199. 
  76. ↑ Lucotte, Gérard (1998-10-31). "Celtic Origin of the C282Y Mutation of Hemochromatosis". Blood Cells, Molecules, and Diseases 24 (20): 433–438. doi:10.1006/bcmd.1998.0212. ISSN 1079-9796. PMID 9851897. http://www.scripps.edu/bcmd/pdfarea/issue_20_98/lucotte.pdf. Retrieved 7 January 2014. 
  77. ↑ 77.0 77.1 (in en) Hemochromatosis: Genetics, Pathophysiology, Diagnosis and Treatment. Cambridge University Press. 2000. ISBN 978-0-521-59380-9. https://books.google.com/books?id=kE6mmwm5d8UC&pg=PA3. 
  78. ↑ "Glycosurie, diabète sucré". Clinique Médicale de l'Hôtel-Dieu de Paris 2: 663–98. 1865. 
  79. ↑ "Hämochromatose". Tageblatt der Naturforschenden Versammlung 1889: 324. 1890. 
  80. ↑ "Friedrich Daniel von Recklinghausen". http://www.whonamedit.com/doctor.cfm/1174.html. 
  81. ↑ Sheldon, JH (1935). "Haemochromatosis". London: Oxford University Press. 
  82. ↑ 82.0 82.1 82.2 82.3 Bacon, Bruce R. (2012). "Hemochromatosis: Discovery of the HFE Gene". Missouri Medicine 109 (2): 133–136. ISSN 0026-6620. PMID 22675794. 
  83. ↑ 83.0 83.1 Brissot, Pierre (June 2003). "The discovery of the new haemochromatosis gene: Feder JN, Gnirke A, Thomas W, Tsuchihashi Z, Ruddy DA, Basava A, et al. A novel MHC class I-like gene is mutated in patients with hereditary haemochromatosis [Nat Genet 1996;13:399–408"] (in en). Journal of Hepatology 38 (6): 704–709. doi:10.1016/S0168-8278(03)00142-9. ISSN 0168-8278. PMID 12763361. https://www.journal-of-hepatology.eu/article/S0168-8278(03)00142-9/abstract. 
  84. ↑ MacDonald, RA (1964). Hemochromatosis and Hemosiderosis. Springfield, IL: Charles C Thomas. 
  85. ↑ "Association of HLA-A3 and HLA-B14 antigens with idiopathic haemochromatosis". Gut 17 (5): 332–334. 1976. doi:10.1136/gut.17.5.332. PMID 1278715. 

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