How did the 1000 Genomes Project improve knowledge of common and rare genetic variants?

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Diagram of a DNA double helix showing its twisted ladder structure, with a close-up of the sugar-phosphate backbone, paired nitrogenous bases (adenine, thymine, cytosine, guanine), and labeled nucleotides and hydrogen bonds. — human genome The human genome is made up of approximately three billion base pairs of deoxyribonucleic acid (DNA). The bases of DNA are adenine (A), thymine (T), guanine (G), and cytosine (C).

The 1000 Genomes Project significantly advanced human genetics by creating a comprehensive catalog of genetic variations across diverse global populations.1

To improve the detection of both common and rare variants, the project employed high-throughput sequencing strategies, including deep-coverage sequencing, which allowed researchers to read DNA segments multiple times for increased accuracy. Specifically:1

Common Variants: The project aimed to identify over 95 percent of single nucleotide polymorphisms (SNPs) that occur with a frequency of at least 1 percent in human populations.1
Rare Variants: By utilizing deep-coverage sequencing of exomes and whole-genome sequencing of trios, the project enhanced the ability to detect low-frequency mutations and rare variants suspected of contributing to disease.1

This high-resolution data enabled scientists to assemble detailed maps of variants, facilitating genome-wide association studies to better understand the genetic basis of health and disease. By making this data publicly available, the project provided a foundational resource for research in medicine and human evolution.1