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Related Experiment Videos

HLA-DR,DQ sequence polymorphisms in Polynesians, Micronesians, and Javanese.

X Gao1, P Zimmet, S W Serjeantson

  • 1Human Genetics Group, John Curtin School of Medical Research, Australian National University, Canberra.

Human Immunology
|July 1, 1992
PubMed
Summary

Polynesian origins are unclear. Genetic analysis of HLA class II genes reveals distinct differences between Polynesians and Javanese, suggesting their genetic makeup isn

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Area of Science:

  • Human genetics
  • Population genetics
  • Molecular anthropology

Background:

  • The origins and dispersal patterns of Polynesian populations remain a significant area of research.
  • Previous studies, including linguistic reconstructions, suggested shared ancestry between Polynesians, Micronesians, and Javanese, potentially originating from Borneo and Sulawesi.
  • Understanding the genetic landscape of these populations is crucial for tracing human migration and settlement in the Pacific.

Purpose of the Study:

  • To investigate the genetic origins of Polynesians using high-resolution analysis of Human Leukocyte Antigen (HLA) class II genes.
  • To compare the genetic profiles of Polynesian populations with Micronesian and Javanese populations to identify distinct genetic markers.
  • To clarify the relationship between Polynesian, Micronesian, and Southeast Asian gene pools.

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Main Methods:

  • Analysis of nucleotide sequence polymorphism at HLA-DRB1, DRB3, DRB5, DQA1, and DQB1 loci in 810 chromosomes.
  • Genotyping of Polynesian (Rarotonga, Western Samoa, Niue), Micronesian (Nauru, Kiribati), and Javanese populations.
  • Comparison of HLA class II haplotypes and allele frequencies between the studied groups.

Main Results:

  • Virtually no overlap was found in HLA class II haplotypes between contemporary Polynesians and Javanese.
  • Significant differences in the population distribution of specific HLA-DRB1 alleles were observed, such as DRB1*1201 and DRB1*1202, which were not apparent in earlier studies.
  • A novel allele, DRB1*1408, was identified across all Polynesian study groups, indicating a unique genetic signature.

Conclusions:

  • The HLA class II genetic profile of Polynesians is not easily explained by derivation from the island Southeast Asian gene pool.
  • The genetic data suggest a more complex origin or distinct evolutionary trajectory for Polynesians compared to Javanese and Micronesians.
  • Further research is needed to fully elucidate the intricate peopling history of the Pacific islands.