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Related Experiment Videos

Microsatellite variation within the human RHCE gene.

T J Kemp1, M Poulter, B Carritt

  • 1MRC Human Biochemical Genetics Unit, University College London, London, UK. tkemp@hgmp.mrc.ac.uk

Vox Sanguinis
|November 5, 1999
PubMed
Summary
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Researchers identified a unique genetic marker within Rh blood group genes to detect the cDe haplotype, common in Black African populations. This finding aids in understanding Rh haplotype evolution and offers a new identification method.

Area of Science:

  • Genetics
  • Molecular Biology
  • Population Genetics

Background:

  • The Rh blood group system is crucial in transfusion medicine and understanding human population genetics.
  • The Rh haplotype cDe is prevalent in Black African populations, but its genetic basis and evolutionary origins are not fully understood.

Purpose of the Study:

  • To develop a novel method for identifying individuals who carry the Rh haplotype cDe.
  • To investigate the evolutionary model of Rh haplotypes, proposing cDe as the progenitor.

Main Methods:

  • DNA samples from 212 donors with known Rh serological phenotypes were analyzed.
  • Polymerase Chain Reaction (PCR) amplification followed by denaturing polyacrylamide gel electrophoresis (DPAGE), denaturing gradient gel electrophoresis (DGGE), and DNA sequencing were employed.

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Main Results:

  • Two adjacent microsatellite repeat elements, (AC)n and (GCAC)n, were discovered within the human Rh blood group genes.
  • Copy number variation in these microsatellites was observed, showing a non-random distribution linked to Rh serological phenotype.
  • This variation was specifically found in alleles of RHCE that express the c antigen.

Conclusions:

  • The predominantly Black African allele cDe exhibits a distinct set of microsatellite alleles.
  • This unique microsatellite signature provides a reliable method for identifying individuals carrying the cDe haplotype.
  • The findings support a model where cDe is the ancestral Rh haplotype, contributing to evolutionary insights.