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MIC2: a human pseudoautosomal gene.

P N Goodfellow1, B Pym, C Pritchard

  • 1Human Molecular Genetics Laboratory, Imperial Cancer Research Fund, London, U.K.

Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
|December 1, 1988
PubMed
Summary
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The MIC2 gene, located in the pseudoautosomal region, is a key marker for mapping sex chromosome recombination. Researchers mapped the pseudoautosomal boundary near MIC2, aiding in understanding sex chromosome evolution and TDF gene location.

Area of Science:

  • Human genetics
  • Molecular biology
  • Genomics

Background:

  • The pseudoautosomal region (PAR) of human sex chromosomes contains unique genes like MIC2 and XGR.
  • MIC2 encodes the 12E7 antigen, a cell-surface molecule with an undefined role.
  • XGR influences the expression of XG and MIC2 genes in cis.

Purpose of the Study:

  • To construct detailed meiotic and long-range restriction maps of the PAR.
  • To precisely locate the pseudoautosomal boundary relative to the MIC2 gene.
  • To predict the chromosomal location of the Testis-Determining Factor (TDF).

Main Methods:

  • Utilized DNA probes from the MIC2 locus for mapping.
  • Employed long-range restriction mapping techniques.
  • Conducted chromosome walking experiments.

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Main Results:

  • Established MIC2 as the most proximal marker in the PAR.
  • Demonstrated rare recombination events encompassing the MIC2 locus.
  • Localized the pseudoautosomal boundary within 40 kb of the MIC2 gene's 3' end.
  • Predicted the chromosomal location of the TDF gene.

Conclusions:

  • The MIC2 gene serves as a crucial landmark for mapping the PAR and sex chromosome recombination.
  • The pseudoautosomal boundary is tightly linked to the MIC2 gene.
  • These mapping efforts provide insights into sex chromosome structure and the location of key genes like TDF.