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How did the International HapMap Project help researchers investigate disease-related 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 International HapMap Project was established to identify genetic variations contributing to human disease by creating a map of haplotypes—sets of alleles that are inherited together on a single chromosome.1

Analyzing millions of individual single nucleotide polymorphisms (SNPs) is inefficient. By identifying haplotype regions, researchers discovered they only needed to "tag" a few representative SNPs to understand the entire region's association with a specific trait or disease. This approach significantly accelerated the process of sorting through the human genome to pinpoint variants relevant to health conditions, such as heart disease or cancers.1

Ultimately, this data facilitated genome-wide association studies, allowing scientists to link specific genetic variants to disease risk. While the project raised ethical concerns regarding potential discrimination against ethnic groups, it remains a vital resource for developing diagnostic techniques, new drugs, and population-based screening technologies essential for disease prevention.12