Biology:Premutation
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A premutation is a situation in which there are an excess number of repeats in a gene that is at risk of increasing in length during reproduction but which does not cause disease in the person with the excess number of repeats.[1] Fragile X syndrome, a trinucleotide repeat disorder, is a condition in which premutations may be present in the parents of affected people.[2] Huntington's disease is another example of a trinucleotide repeat disorder in which individuals with a certain excess of repeats (27–39) of the CAG codon in the Huntingtin gene may not have the disease but are more likely to have a child with enough repeats (40+) to cause the disease.[3]
References
- ↑ Gersen, Steven L.; Keagle, Martha B. (2008) (in en). The Principles of Clinical Cytogenetics. Springer Science & Business Media. p. 505. ISBN 9781592598335. https://books.google.com/books?id=hSDrd9MfSCEC&pg=PA505.
- ↑ "fragile X syndrome". April 2012. Archived from the original on 9 October 2016. https://web.archive.org/web/20161009162713/https://ghr.nlm.nih.gov/condition/fragile-x-syndrome. Retrieved 7 October 2016.
- ↑ "Huntington's disease". Lancet 369 (9557): 218–28. January 2007. doi:10.1016/S0140-6736(07)60111-1. PMID 17240289.
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