Biology:1000 Genomes Project

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Short description: International research effort on genetic variation

The 1000 Genomes Project (1KGP), taken place from January 2008 to 2015, was an international research effort to establish the most detailed catalogue of human genetic variation at the time. Scientists planned to sequence the genomes of at least one thousand anonymous healthy participants from a number of different ethnic groups within the following three years, using advancements in newly developed technologies. In 2010, the project finished its pilot phase, which was described in detail in a publication in the journal Nature.[1] In 2012, the sequencing of 1092 genomes was announced in a Nature publication.[2] In 2015, two papers in Nature reported results and the completion of the project and opportunities for future research.[3][4]

Many rare variations, restricted to closely related groups, were identified, and eight structural-variation classes were analyzed.[5]

The project united multidisciplinary research teams from institutes around the world, including China , Italy, Japan , Kenya, Nigeria, Peru, the United Kingdom , and the United States contributing to the sequence dataset and to a refined human genome map freely accessible through public databases to the scientific community and the general public alike.[2]

The International Genome Sample Resource was created to host and expand on the data set after the project's end.[6]

Changes in the number and order of genes (A-D) create genetic diversity within and between populations.

Background

Since the completion of the Human Genome Project advances in human population genetics and comparative genomics enabled further insight into genetic diversity.[7] The understanding about structural variations (insertions/deletions (indels), copy number variations (CNV), retroelements), single-nucleotide polymorphisms (SNPs), and natural selection were being solidified.[8][9][10][11]

The diversity of Human genetic variation such as that Indels were being uncovered and investigating human genomic variations[citation needed]

Natural selection

It also aimed to provide evidence that can be used to explore the impact of Natural selection on population differences. Patterns of DNA polymorphisms can be used to reliably detect signatures of selection and may help to identify genes that might underlie variation in disease resistance or drug metabolism.[12][13] Such insights could improve understanding of phenotypic variations, genetic disorders and Mendelian inheritance and their effects on survival and/or reproduction of different human populations.

Project description

Goals

The 1000 Genomes Project was designed to bridge the gap of knowledge between rare genetic variants that have a severe effect predominantly on simple traits (e.g. cystic fibrosis, Huntington disease) and common genetic variants have a mild effect and are implicated in complex traits (e.g. cognition, diabetes, heart disease).[14]

The primary goal of this project was to create a complete and detailed catalogue of human genetic variations, which can be used for association studies relating genetic variation to disease. The consortium aimed to discover >95 % of the variants (e.g. SNPs, CNVs, indels) with minor allele frequencies as low as 1% across the genome and 0.1-0.5% in gene regions, as well as to estimate the population frequencies, haplotype backgrounds and linkage disequilibrium patterns of variant alleles.[15]

Secondary goals included the support of better SNP and probe selection for genotyping platforms in future studies and the improvement of the human reference sequence. The completed database was expected be a useful tool for studying regions under selection, variation in multiple populations and understanding the underlying processes of mutation and recombination.[15]

Outline

The human genome consists of approximately 3 billion DNA base pairs and is estimated to carry around 20,000 protein coding genes. In designing the study the consortium needed to address several critical issues regarding the project metrics such as technology challenges, data quality standards and sequence coverage.[15]

Over the course of the next three years,[clarification needed] scientists at the Sanger Institute, BGI Shenzhen and the National Human Genome Research Institute’s Large-Scale Sequencing Network planned to sequence a minimum of 1,000 human genomes. Due to the large amount of sequence data that was required, recruiting additional participants was maintained.[14]

Almost 10 billion bases were to be sequenced per day over a period of the two year production phase, equating to more than two human genomes every 24 hours. The intended sequence dataset was to comprise 6 trillion DNA bases, 60-fold more sequence data than what has been published in DNA databases at the time.[14]

To determine the final design of the full project three pilot studies were to be carried out within the first year of the project. The first pilot intends to genotype 180 people of 3 major geographic groups at low coverage (2×). For the second pilot study, the genomes of two nuclear families (both parents and an adult child) are going to be sequenced with deep coverage (20× per genome). The third pilot study involves sequencing the coding regions (exons) of 1,000 genes in 1,000 people with deep coverage (20×).[14][15]

It was estimated that the project would likely cost more than $500 million if standard DNA sequencing technologies were used. Several newer technologies (e.g. Solexa, 454, SOLiD) were to be applied, lowering the expected costs to between $30 million and $50 million. The major support will be provided by the Wellcome Trust Sanger Institute in Hinxton, England; the Beijing Genomics Institute, Shenzhen (BGI Shenzhen), China; and the NHGRI, part of the National Institutes of Health (NIH).[14]

In keeping with Fort Lauderdale principles , all genome sequence data (including variant calls) is freely available as the project progresses and can be downloaded via ftp from the 1000 genomes project webpage.

Human genome samples

Locations of population samples of 1000 Genomes Project.[16] Each circle represents the number of sequences in the final release.

Based on the overall goals for the project, the samples will be chosen to provide power in populations where association studies for common diseases are being carried out. Furthermore, the samples do not need to have medical or phenotype information since the proposed catalogue will be a basic resource on human variation.[15]

For the pilot studies human genome samples from the HapMap collection will be sequenced. It will be useful to focus on samples that have additional data available (such as ENCODE sequence, genome-wide genotypes, fosmid-end sequence, structural variation assays, and gene expression) to be able to compare the results with those from other projects.[15]


ID Place Population Detail
ASW United States* African Ancestry in Southwestern USA Detail
ACB Template:Country data BRB* African Caribbean in Barbados Detail
BEB Template:Country data BGD Bengali in Bangladesh Detail
GBR United Kingdom British from England and Scotland Detail
CDX China Chinese Dai in Xishuangbanna, China Detail
CLM Colombia Colombian in Medellín, Colombia Detail
ESN Template:Country data NGR Esan in Nigeria Detail
FIN Finland Finnish in Finland Detail
GWD Template:Country data GMB Gambian in Western Division – Mandinka Detail
GIH United States* Gujarati Indians in Houston, Texas , United States Detail
CHB China Han Chinese in Beijing, China Detail
CHS China Han Chinese South, China Detail
IBS Spain Iberian populations in Spain Detail
ITU United Kingdom* Indian Telugu in the U.K. Detail
JPT Japan Japanese in Tokyo, Japan Detail
KHV Vietnam Kinh in Ho Chi Minh City, Vietnam Detail
LWK Kenya Luhya in Webuye, Kenya Detail
MSL Template:Country data SLE Mende in Sierra Leone Detail
MXL United States* Mexican Ancestry in Los Angeles , California , United States Detail
PEL Peru Peruvian in Lima, Peru Detail
PUR Template:Country data PUR Puerto Rican in Puerto Rico Detail
PJL Pakistan Punjabi in Lahore, Pakistan Detail
STU United Kingdom* Sri Lankan Tamil in the U.K. Detail
TSI Italy Toscani in Italia Detail
YRI Template:Country data NGR Yoruba in Ibadan, Nigeria Detail
CEU United States* Utah residents with Northern and Western European ancestry from the CEPH collection Detail

* Population that was collected in diaspora

Community meeting

Data generated by the 1000 Genomes Project is widely used by the genetics community, making the first 1000 Genomes Project one of the most cited papers in biology.[17] To support this user community, the project held a community analysis meeting in July 2012 that included talks highlighting key project discoveries, their impact on population genetics and human disease studies, and summaries of other large-scale sequencing studies.[18]

Project findings

Pilot phase

The pilot phase consisted of three projects:

  • low-coverage whole-genome sequencing of 179 individuals from 4 populations
  • high-coverage sequencing of 2 trios (mother-father-child)
  • exon-targeted sequencing of 697 individuals from 7 populations

It was found that on average, each person carries around 250–300 loss-of-function variants in annotated genes and 50-100 variants previously implicated in inherited disorders. Based on the two trios, it is estimated that the rate of de novo germline mutation is approximately 10−8 per base per generation.[1]

See also

References

  1. ↑ 1.0 1.1 "A map of human genome variation from population-scale sequencing". Nature 467 (7319): 1061–73. October 2010. doi:10.1038/nature09534. PMID 20981092. Bibcode: 2010Natur.467.1061T. 
  2. ↑ 2.0 2.1 "An integrated map of genetic variation from 1,092 human genomes". Nature 491 (7422): 56–65. November 2012. doi:10.1038/nature11632. PMID 23128226. Bibcode: 2012Natur.491...56T. 
  3. ↑ "A global reference for human genetic variation". Nature 526 (7571): 68–74. October 2015. doi:10.1038/nature15393. PMID 26432245. Bibcode: 2015Natur.526...68T. 
  4. ↑ "An integrated map of structural variation in 2,504 human genomes". Nature 526 (7571): 75–81. October 2015. doi:10.1038/nature15394. PMID 26432246. Bibcode: 2015Natur.526...75.. 
  5. ↑ "Variety of life". Nature News & Comment. 2015-09-30. http://www.nature.com/news/variety-of-life-1.18454. 
  6. ↑ "1000 Genomes Project | Scientific Computing and Data". 2020-07-07. https://labs.icahn.mssm.edu/minervalab/resources/data-ark/1000-genomes/. 
  7. ↑ "Genomics: In search of rare human variants". Nature 467 (7319): 1050–1. October 2010. doi:10.1038/4671050a. PMID 20981085. Bibcode: 2010Natur.467.1050N. 
  8. ↑ JC Long, Human Genetic Variation: The mechanisms and results of microevolution, American Anthropological Association (2004)
  9. ↑ "Comparative sequencing of human and chimpanzee MHC class I regions unveils insertions/deletions as the major path to genomic divergence". Proceedings of the National Academy of Sciences of the United States of America 100 (13): 7708–13. June 2003. doi:10.1073/pnas.1230533100. PMID 12799463. Bibcode: 2003PNAS..100.7708A. 
  10. ↑ "Global variation in copy number in the human genome". Nature 444 (7118): 444–54. November 2006. doi:10.1038/nature05329. PMID 17122850. Bibcode: 2006Natur.444..444R. 
  11. ↑ "Natural selection has driven population differentiation in modern humans". Nature Genetics 40 (3): 340–5. March 2008. doi:10.1038/ng.78. PMID 18246066. 
  12. ↑ EE Harris et al., The molecular signature of selection underlying human adaptations, Yearbook of Physical Anthropology 49: 89-130 (2006)
  13. ↑ "Signatures of natural selection in the human genome". Nature Reviews. Genetics 4 (2): 99–111. February 2003. doi:10.1038/nrg999. PMID 12560807. 
  14. ↑ 14.0 14.1 14.2 14.3 14.4 G Spencer, International Consortium Announces the 1000 Genomes Project, EMBARGOED (2008) http://www.nih.gov/news/health/jan2008/nhgri-22.htm
  15. ↑ 15.0 15.1 15.2 15.3 15.4 15.5 Meeting Report: A Workshop to Plan a Deep Catalog of Human Genetic Variation, (2007) http://www.1000genomes.org/sites/1000genomes.org/files/docs/1000Genomes-MeetingReport.pdf
  16. ↑ "The Genome Russia project: closing the largest remaining omission on the world Genome map". GigaScience 4: 53. 2015. doi:10.1186/s13742-015-0095-0. PMID 26568821. 
  17. ↑ C. King (2012) The Hottest Research of 2011. Science Watch http://archive.sciencewatch.com/newsletter/2012/201203/hottest_research_2012/
  18. ↑ 1000 Genomes Project Community Analysis Meeting http://1000gconference.sph.umich.edu/

External links



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