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Analysis of human Per4.

A L Gotter1, S M Reppert

  • 1Laboratory of Developmental Chronobiology, MassGeneral Hospital for Children, Boston, MA 02114, USA.

Brain Research. Molecular Brain Research
|August 3, 2001
PubMed
Summary
This summary is machine-generated.

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Human and rhesus monkey Per4 (Period gene family) are non-functional pseudogenes. These genes likely arose from a retrotransposition event of an ancestral Per3 gene, representing a recent addition to the Period gene family.

Area of Science:

  • Genetics
  • Molecular Biology
  • Chronobiology

Background:

  • Circadian rhythms are regulated by molecular feedback loops involving clock gene expression.
  • The Drosophila period (Per) gene is crucial for circadian timing.
  • Mammalian homologs (mPer1-3, hPer1-3) are vital for circadian clock function.

Purpose of the Study:

  • To investigate the nature of a newly identified fourth human Per gene (hPer4).
  • To determine the evolutionary origin and functional status of hPer4 and its primate orthologs.

Main Methods:

  • Bioinformatic analysis of human genome draft sequence.
  • Sequence comparison of human and rhesus monkey Per4 (RmPer4) genes.
  • Phylogenetic analysis to determine evolutionary relationships.

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Main Results:

  • hPer4 lacks a functional open reading frame due to numerous mutations (deletions, insertions, frameshifts).
  • hPer4's genomic structure is intronless and contains remnants of a mobile element.
  • RmPer4 exhibits similar anomalies and high sequence identity (92.8%) to hPer4.
  • Per4 genes originated from a Per3 predecessor, indicating recent evolution.

Conclusions:

  • hPer4 and RmPer4 are non-functional pseudogenes.
  • These pseudogenes resulted from the retrotransposition of an ancestral Per3 gene.
  • Per4 represents a recently evolved, non-functional addition to the Period gene family.