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Related Experiment Videos

Evidence for two cDNA clones encoding human GM2-activator protein.

S Nagarajan1, H C Chen, S C Li

  • 1Department of Biochemistry, Tulane University School of Medicine, New Orleans, LA 70112.

The Biochemical Journal
|March 15, 1992
PubMed
Summary

Researchers identified two forms of GM2 activator protein in human placenta, pGM2A and GAP. These distinct cDNA sequences suggest alternative splicing or gene duplication, impacting GM2 activator function.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • The GM2 activator protein is crucial for the enzymatic hydrolysis of GM2 gangliosides.
  • Understanding the genetic basis of GM2 activator protein diversity is important for metabolic disease research.

Purpose of the Study:

  • To isolate and characterize complementary DNAs (cDNAs) encoding the GM2 activator protein from human placenta.
  • To investigate the relationship between different GM2 activator cDNA sequences found in placental tissue.

Main Methods:

  • Isolation of cDNAs using lambda gt11 expression libraries from human placenta.
  • DNA sequencing to determine the genetic makeup of isolated cDNAs.
  • Polymerase Chain Reaction (PCR) to detect the presence of specific RNA transcripts.

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  • Northern and Southern blotting to analyze mRNA and genomic DNA hybridization patterns.

    • Main Results:

    • Two distinct cDNAs, pGM2A (648 bp) and GAP (1093 bp), encoding the GM2 activator were isolated.
    • Sequence analysis revealed high identity between pGM2A and GAP in the initial region, with divergence thereafter.
    • PCR confirmed the expression of both GM2 activator species in placental RNA.
    • Both cDNAs hybridized to approximately 2.3 kb mRNAs and identical single bands on genomic Southern blots, suggesting a common gene origin or related genes.

    Conclusions:

    • Human placenta expresses at least two forms of GM2 activator mRNA, originating from related genetic loci or alternative splicing.
    • The sequence divergence between pGM2A and GAP may lead to functional differences in GM2 ganglioside metabolism.
    • Further studies are warranted to elucidate the precise genetic mechanism and functional implications of these GM2 activator variants.