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A quick, direct method that can differentiate expressed mitochondrial genes from their nuclear pseudogenes

R V Collura1, M R Auerbach, C B Stewart

  • 1Department of Biological Sciences, University at Albany, State University of New York 12222, USA.

Current Biology : CB
|October 1, 1996
PubMed
Summary

A new method using reverse transcriptase-coupled PCR can distinguish true mitochondrial DNA (mtDNA) from nuclear pseudogenes. This technique accurately sequenced the proboscis monkey cytochrome b gene, resolving phylogenetic uncertainties.

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Area of Science:

  • Genetics
  • Molecular Biology
  • Evolutionary Biology

Background:

  • Direct sequencing of mitochondrial DNA (mtDNA) via polymerase chain reaction (PCR) is common in genetic research.
  • Nuclear copies of mitochondrial genes (pseudogenes) can interfere with accurate mtDNA sequencing.
  • Distinguishing authentic mtDNA from nuclear pseudogenes is challenging, especially for recently transferred genes.

Purpose of the Study:

  • To develop a method for identifying expressed mitochondrial genes.
  • To resolve ambiguous sequencing results caused by nuclear pseudogenes.
  • To clarify the phylogenetic position of the proboscis monkey.

Main Methods:

  • Utilized reverse transcription coupled to PCR (RT-PCR) to amplify polyadenylated messenger RNAs (mRNAs) derived from mtDNA.

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  • Applied this method to the cytochrome b gene of the proboscis monkey.
  • Conducted phylogenetic analysis using the obtained cytochrome b gene sequences.

    • Main Results:

    • RT-PCR successfully amplified an unambiguous sequence for the proboscis monkey mitochondrial cytochrome b gene.
    • Traditional DNA-based PCR methods yielded ambiguous sequences due to the presence of nuclear pseudogenes.
    • Phylogenetic analysis placed the proboscis monkey with Asian langurs, revising previous classifications.

    Conclusions:

    • Reverse transcriptase-coupled PCR is an effective method for identifying expressed mitochondrial genes and overcoming pseudogene interference.
    • This technique provides accurate sequences for phylogenetic studies, even in cases of recent gene transfer.
    • The study refines the evolutionary relationships within the Colobinae subfamily.