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Gene conversion and GC-content evolution in mammalian Hsp70.

Grzegorz Kudla1, Aleksandra Helwak, Leszek Lipinski

  • 1International Institute of Molecular and Cell Biology, Warsaw, Poland. grzesiek@iimcb.gov.pl

Molecular Biology and Evolution
|April 16, 2004
PubMed
Summary

Gene conversion explains high GC content in mammalian Hsp70 genes, but this doesn't affect heat-shock expression. This study supports the biased gene conversion hypothesis for GC-content evolution.

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Area of Science:

  • Genetics
  • Molecular Biology
  • Evolutionary Biology

Background:

  • Mammalian genes exhibit varied nucleotide usage, particularly in heat shock protein 70 (Hsp70) paralogs.
  • Understanding nucleotide composition regulation is key to gene expression mechanisms.

Purpose of the Study:

  • To investigate the mechanisms regulating nucleotide usage in mammalian Hsp70 genes.
  • To determine the role of GC content in Hsp70 expression during heat shock.

Main Methods:

  • Comparative sequence analysis of human and mouse Hsp70 paralogs (HSPA1A, HSPA1B, HSPA1L).
  • Phylogenetic analysis to identify gene conversion events.
  • In vitro translation experiments to assess the effect of GC content on translation efficiency.

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Main Results:

  • HSPA1A and HSPA1B genes are nearly identical; HSPA1L shows mixed similarity.
  • Gene conversion has homogenized coding regions of HSPA1A/B and parts of HSPA1L.
  • GC-rich regions are associated with gene conversion, suggesting an ongoing mechanism.
  • High GC content did not influence Hsp70 translation efficiency at high temperatures.

Conclusions:

  • Biased gene conversion is a strong driver of GC-content evolution in mammalian Hsp70 genes.
  • The functional impact of GC-rich sequences on Hsp70 expression during heat shock is minimal.