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Multiple genes encode the human Na+,K+-ATPase catalytic subunit.

M M Shull, J B Lingrel

    Proceedings of the National Academy of Sciences of the United States of America
    |June 1, 1987
    PubMed
    Summary
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    Researchers identified four human genes encoding the Na+,K+-ATPase catalytic subunit. Two genes, alpha A and alpha B, code for known alpha and alpha(+) isoforms, while two novel genes, alpha C and alpha D, were also discovered.

    Area of Science:

    • Molecular Biology
    • Genetics
    • Biochemistry

    Background:

    • The Na+,K+-ATPase (sodium-potassium pump) is a crucial enzyme for maintaining cellular ion gradients.
    • Multiple isoforms of the Na+,K+-ATPase catalytic subunit exist, suggesting complex regulatory roles.
    • Understanding the human genes encoding these isoforms is essential for comprehending their function and potential dysregulation.

    Purpose of the Study:

    • To identify and characterize the human genes responsible for encoding the Na+,K+-ATPase catalytic subunit.
    • To determine which identified genes correspond to known alpha and alpha(+) isoforms.
    • To investigate the existence of potentially novel isoforms of the Na+,K+-ATPase catalytic subunit.

    Main Methods:

    • Construction and screening of a human genomic library using heterologous cDNA probes.

    Related Experiment Videos

  • Isolation and characterization of genomic sequences (150 kilobases).
  • Restriction mapping, Southern blot hybridization, and DNA sequencing to identify and analyze four distinct genes (alpha A, alpha B, alpha C, alpha D).

    • Main Results:

    • Four human genes (alpha A, alpha B, alpha C, alpha D), each 20-25 kilobases, were identified.
    • Genes alpha A and alpha B were shown to encode the previously known alpha and alpha(+) isoforms, respectively.
    • Genes alpha C and alpha D displayed homology to Na+,K+-ATPase catalytic subunit sequences but did not match any previously identified isoforms, suggesting novel genes.

    Conclusions:

    • The human genome contains at least four genes for the Na+,K+-ATPase catalytic subunit.
    • Two novel genes, alpha C and alpha D, have been identified, expanding the known repertoire of Na+,K+-ATPase isoforms.
    • Further research is warranted to elucidate the functional significance of the newly discovered alpha C and alpha D genes and their encoded proteins.