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Related Experiment Videos

Ly49 and CD94/NKG2: developmentally regulated expression and evolution.

F Takei1, K L McQueen, M Maeda

  • 1Terry Fox Laboratory, BC Cancer Agency, Vancouver, Canada. ftakei@bccancer.bc.ca

Immunological Reviews
|August 22, 2001
PubMed
Summary
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Murine natural killer (NK) cells develop diverse MHC class I receptor repertoires, including Ly49 and CD94/NKG2, through a developmentally regulated process. Functional Ly49 genes exist in baboons, suggesting recent loss in humans.

Area of Science:

  • Immunology
  • Cell Biology
  • Developmental Biology

Background:

  • Murine natural killer (NK) cells express MHC class I-specific receptors, primarily the Ly49 family and CD94/NKG2 heterodimers.
  • Receptor repertoire diversity in NK cells is established during development, with fetal NK cells exhibiting limited diversity compared to adult populations.
  • These receptors also function on T cells, but their expression patterns differ significantly between NK and T cells, highlighting developmental regulation.

Purpose of the Study:

  • To investigate the developmental regulation of Ly49 and CD94/NKG2 receptor expression in murine NK cells.
  • To explore the mechanisms governing Ly49 gene expression by examining putative regulatory regions.
  • To understand the evolutionary trajectory of Ly49 genes by comparing primate species.

Main Methods:

Related Experiment Videos

  • Analysis of receptor repertoire diversity in fetal and adult murine NK cells.
  • In vitro differentiation studies of NK cells from bone marrow progenitors and embryonic stem cells.
  • Examination of DNA sequences in putative regulatory regions of Ly49 genes.
  • Comparative genomic analysis of Ly49 genes across primate species.

Main Results:

  • NK cell receptor expression is developmentally regulated, with distinct patterns observed in fetal versus adult populations.
  • NK cells acquire Ly49 and CD94/NKG2 receptors in an orderly fashion during differentiation.
  • Putative regulatory regions of Ly49 genes with different expression patterns show conserved sequences.
  • A functional Ly49 gene was identified in baboons, indicating a recent evolutionary loss in the human lineage.

Conclusions:

  • The expression of Ly49 and CD94/NKG2 receptors on NK cells is tightly controlled during development.
  • Mechanisms regulating Ly49 expression may involve conserved sequences in their regulatory regions.
  • The Ly49 gene family has undergone recent functional extinction in the human lineage, offering insights into immune gene evolution.