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Using Phylogenetic Analysis to Investigate Eukaryotic Gene Origin
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Using Phylogenetic Analysis to Investigate Eukaryotic Gene Origin

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Phylogenetic analysis of the MS4A and TMEM176 gene families

Jonathan Zuccolo1, Jeremy Bau, Sarah J Childs

  • 1Department of Biochemistry and Molecular Biology, University of Calgary, Calgary, Alberta, Canada.

Plos One
|February 27, 2010
PubMed
Abstract

Insights

The MS4A gene family originated in cartilaginous fish outside the immune system. These genes later evolved diverse immune and non-immune functions across species.

Area of Science:

  • Genomics
  • Evolutionary Biology
  • Immunology

Background:

  • The MS4A gene family, including CD20, comprises membrane proteins with varied tissue expression, notably in the hematopoietic system.
  • The TMEM176 gene group shares similarities with MS4A genes, with some members implicated in immune functions.
  • Understanding the evolutionary trajectory and early expression patterns of MS4A/TMEM176 genes may illuminate their origins in immune cells.

Purpose of the Study:

  • To investigate the evolutionary history of the MS4A and TMEM176 gene families.
  • To examine the tissue expression of the earliest MS4A gene members across different species.
  • To explore the potential origins of MS4A genes within immune cell lineages.

Main Methods:

  • Comparative genomics to identify orthologs and homologs of MS4A and TMEM176 genes across vertebrate species.
  • Phylogenetic analysis to trace the evolutionary relationships of these gene families.
  • Tissue expression analysis in primitive organisms like spiny dogfish and zebrafish.

Main Results:

  • MS4A gene orthologs are exclusive to mammals, while homologs are found in most jawed vertebrates.
  • TMEM176 genes are present in mammals and bony fish; unusual tandem MS4A gene structures were found in chickens and early mammals.
  • MS4A genes were identified in spiny dogfish, the most primitive organism studied, with expression outside the hematopoietic system in both spiny dogfish and zebrafish.

Conclusions:

  • MS4A genes likely emerged in cartilaginous fish with functions distinct from the immune system.
  • Subsequent diversification led to modern MS4A genes with roles in both immune and non-immune cells.
  • The evolutionary path suggests a gradual acquisition and specialization of immune functions within the MS4A gene family.

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