Mitochondrial DNA hypervariable region 1 polymorphism in Singapore Chinese population

Area of Science:

• Genetics
• Population Genetics
• Mitochondrial DNA Analysis

Background:

• Mitochondrial DNA (mtDNA) hypervariable region 1 (HV1) is crucial for tracing human evolutionary history and population migrations.
• Understanding HV1 sequence polymorphisms provides insights into the genetic diversity and ancestry of specific populations.

Purpose of the Study:

• To characterize the genetic diversity and haplogroup distribution within the mitochondrial DNA HV1 sequences of 100 unrelated Singaporean Chinese individuals.
• To identify common single nucleotide polymorphisms (SNPs) and haplotypes within this population group.

Main Methods:

• Analysis of sequence polymorphisms in the mitochondrial DNA hypervariable region 1 (HV1) from 100 Singaporean Chinese subjects.
• Identification and frequency determination of variable sites, single nucleotide polymorphisms (SNPs), and haplotypes.
• Haplogroup classification based on observed polymorphic sites.

Main Results:

• Ninety-five distinct haplotypes were identified across 113 variable sites within the HV1 region (nt 16045-16364).
• Frequent SNPs were observed at positions 16223, 16045, 16129, 16362, and 16189, with haplotype 16045-16223 being the most common.
• Common haplogroups included A, F1a, M7b1, B5a, and D4b; nucleotide diversity was high (0.999).
• A cytosine-stretch region near nt 16189 was present in 22% of the sample, and transitions were more frequent than transversions.

Conclusions:

• The study provides a detailed genetic profile of the mitochondrial DNA HV1 region in Singaporean Chinese.
• The findings contribute valuable data to the understanding of East Asian population genetics and maternal lineage diversity.
• The observed haplogroup distribution and specific polymorphisms offer markers for future anthropological and genetic studies.