1000Genomes

1000Genomes catalogs human genetic variation by integrating whole-genome sequencing, exome sequencing, and microarray genotyping data from 2,504 individuals across 26 global populations to support population-scale genomic analysis.

Key Features:

• Comprehensive Variant Catalogue: Identifies over 88 million variants, including 84.7 million single nucleotide polymorphisms (SNPs), 3.6 million short insertions/deletions (indels), and approximately 60,000 structural variants, phased into high-quality haplotypes capturing more than 99% of SNPs with frequency greater than 1%.
• Structural Variant Characterization: Integrates eight structural variant classes, including balanced and unbalanced variants, revealing gene-intersecting variants, population stratification patterns, and naturally occurring homozygous gene knockouts.
• Population Genetic Diversity: Profiles rare and common variants across 26 populations, demonstrating geographic differentiation and population-specific variant frequencies influenced by purifying selection.
• Functional Variant Insights: Provides evidence linking evolutionary conservation and coding consequences to the strength of purifying selection and identifies rare non-coding variants affecting conserved regulatory elements such as transcription-factor-binding sites.

Scientific Applications:

• Disease Genetics: Supports investigation of genetic contributions to common and rare diseases through large-scale variant reference data.
• Genotype–Phenotype Analysis: Enables studies examining relationships between genetic variants and phenotypic traits.
• Genome-Wide Association Studies: Provides population-scale reference variation to improve variant discovery, imputation, and interpretation in GWAS and functional genomic analyses.
• Evolutionary Genomics: Facilitates analysis of mutation rates, population structure, and signatures of natural selection in human populations.

Methodology:

Variant discovery and population-scale genomic analysis were performed using low-coverage whole-genome sequencing, deep exome sequencing, and dense microarray genotyping across multiple human populations.