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Mitochondrial gene expression in Cucurbitaceae: conserved and variable features.

D B Stern1, K J Newton

  • 1Carnegie Institution of Washington, Department of Plant Biology, Stanford, California 94305.

Current Genetics
|January 1, 1985
PubMed
Summary
This summary is machine-generated.

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Mitochondrial DNA (mtDNA) in Cucurbitaceae plants shows conserved "core" sequences. Despite genome size variation, gene transcription and protein synthesis reveal insights into mitochondrial gene expression and untranslated RNA in muskmelon.

Area of Science:

  • Plant molecular biology
  • Mitochondrial genomics
  • Evolutionary biology

Background:

  • Mitochondrial genome size varies significantly across the Cucurbitaceae family.
  • Understanding mitochondrial DNA (mtDNA) conservation and gene expression is crucial for plant evolution.

Purpose of the Study:

  • To investigate mtDNA sequence conservation across diverse Cucurbitaceae genomes.
  • To analyze transcriptional patterns and translation products of mitochondrial genes.
  • To correlate genome size variation with gene expression in Cucurbitaceae mitochondria.

Main Methods:

  • Comparative analysis of mitochondrial DNA (mtDNA) sequences.
  • Hybridization assays using mtRNA and mtDNA restriction fragments.
  • Analysis of polypeptide synthesis by isolated mitochondria.

Related Experiment Videos

  • Identification of mitochondrial transcripts using cloned maize mitochondrial genes.

    • Main Results:

    • A conserved set of mtDNA sequences, termed "core" DNA, is present in all examined cucurbit genomes.
    • In watermelon, only "core" DNA-containing fragments hybridize with mtRNA.
    • Similar numbers of polypeptides are synthesized across species, but muskmelon exhibits extra transcribed mtDNA sequences.
    • Mitochondrial transcripts varied in size and number among cucurbit species.

    Conclusions:

    • The presence of "core" DNA suggests its essential role in mitochondrial function across Cucurbitaceae.
    • The findings indicate that some mitochondrial RNA (mtRNA) may be untranslated in species with larger genomes, like muskmelon.
    • Transcriptional complexity does not directly correlate with mitochondrial genome size in this plant family.