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Copy number polymorphisms in new HapMap III and Singapore populations
Chee-Seng Ku1, Shu-Mei Teo, Nasheen Naidoo
1Centre for Molecular Epidemiology, Department of Epidemiology and Public Health (MD3), Yong Loo Lin School of Medicine, National University of Singapore, 16 Medical Drive, Singapore. g0700040@nus.edu.sg
Journal of Human Genetics
|June 17, 2011
Summary
This study identifies novel copy number variations (CNVs) in diverse populations using advanced genotyping. Many CNVs are specific to non-African ancestries and linked to complex diseases, offering new genetic insights.
Area of Science:
- Genetics
- Genomics
- Population Genetics
Background:
- Copy number variations (CNVs) are crucial genetic elements influencing human traits and diseases.
- Advancements in genotyping technologies enable higher resolution detection of CNVs.
- Previous studies, like McCarroll et al. (2008), established foundational CNV catalogs.
Purpose of the Study:
- To identify and characterize copy number polymorphisms (CNPs) in Singaporean and HapMap III populations using high-density genotyping.
- To investigate the population-specific distribution and frequency of CNPs.
- To explore the association of CNPs with complex diseases and pharmacogenetic traits.
Main Methods:
- Application of high-density SNP arrays and CNV-specific probes.
- Analysis of 859 samples from three Singaporean and seven HapMap III populations.
- Statistical analysis including pairwise comparisons and false discovery rate (FDR) control.
Main Results:
- Identification of 1291 autosomal CNPs, with ~50% unique to non-African ancestries.
- Significant frequency differences in CNPs across 10 populations, with 698 loci showing FDR < 0.01.
- Overlap of significant CNPs with genes implicated in age-related macular degeneration, cancer, and pharmacogenetics.
- Discovery of novel CNV loci potentially associated with various complex diseases, including leukemia, breast cancer, and diabetes.
- Identification of 5014 novel copy number loci not reported in prior studies.
Conclusions:
- CNP distribution is highly variable across global populations, particularly between African and non-African ancestries.
- CNPs represent a significant source of genetic variation linked to complex diseases and drug responses.
- This study expands the catalog of known CNVs and highlights their importance in human genetic diversity and disease susceptibility.
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02:26Comparing Copy Number Variations and SNPs
Sequencing of the human genome has opened up several best-kept secrets of the genome. Scientists have identified thousands of genome variations that exist within a population. These variations can be a single nucleotide or a larger chromosomal variation.
Copy number variations or CNVs are the structural variations that cover more than 1kb of DNA sequence. The single nucleotide polymorphism (SNP), on the other hand, is a single nucleotide change or a point mutation that is found in more than 1%...
Copy number variations or CNVs are the structural variations that cover more than 1kb of DNA sequence. The single nucleotide polymorphism (SNP), on the other hand, is a single nucleotide change or a point mutation that is found in more than 1%...
01:05Single Nucleotide Polymorphisms-SNPs
A single nucleotide polymorphism or SNP is a single nucleotide variation at a specific genomic position in a large population. It is the most prevalent type of sequence variation found in the human genome. Point mutations that occur in more than 1% of the population qualify as SNPs. These are present once every 1000 nucleotides on an average in the human genome. Replacement of a purine with another purine (A/G) or a pyrimidine with another pyrimidine (C/T) is known as a transition. In contrast,...
01:11Genome-wide Association Studies-GWAS
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The human genome is over 99.9% identical between individuals, yet genetic differences exist at millions of bases. The human genome contains approximately 3 million variant positions per individual, many of which are heterozygous, contributing to genetic diversity and individual traits. Genetic variations include single-nucleotide polymorphisms (SNPs), insertions, deletions, and copy number variations (CNVs).SNPs, the most common variation, involve single-base changes in DNA. These can be...