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Related Experiment Videos

Human gap junction protein connexin31: molecular cloning and expression analysis

K Wenzel1, D Manthey, K Willecke

  • 1Abt. Molekulargenetik, Universität Bonn, Germany.

Biochemical and Biophysical Research Communications
|August 15, 1998
PubMed
Summary

Researchers isolated and characterized the human connexin31 (Cx31) gene, finding its coding region and mapping it to chromosome 1p34-p36. Cx31 showed weak expression in keratinocytes, suggesting a role in skin cell communication.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Cell Biology

Background:

  • Connexins (Cx) form gap junctions, crucial for intercellular communication.
  • Connexin31 (Cx31) is implicated in epidermal development and disease.
  • Understanding human Cx31 gene structure and expression is vital for its functional study.

Purpose of the Study:

  • To isolate and characterize the human connexin31 (Cx31) gene.
  • To determine the Cx31 gene's genomic location and expression patterns in human keratinocytes.
  • To analyze the deduced Cx31 polypeptide sequence and phosphorylation sites.

Main Methods:

  • Human genomic DNA isolation and cloning.
  • Northern blot hybridization for transcript analysis.
  • Immunofluorescence assays for protein expression.

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  • Human-mouse somatic cell hybrid analysis for gene mapping.

    • Main Results:

    • The complete coding region of human Cx31 was identified within the second exon (810 nucleotides).
    • The deduced Cx31 polypeptide has 270 amino acids, with sequence similarity to rodent Cx31 but fewer phosphorylation sites.
    • Two Cx31 transcripts (2.2 and 1.8/1.9 kb) were detected in keratinocyte cell lines (HaCaT and HEK).
    • Cx31 expression was found to be relatively weak in HaCaT and HEK cells.
    • The Cx31 gene was mapped to the human chromosomal region 1p34-p36.

    Conclusions:

    • The human Cx31 gene structure and its transcript variants have been elucidated.
    • Cx31 exhibits limited phosphorylation potential and weak expression in human keratinocytes.
    • The Cx31 gene's localization to 1p34-p36 provides a basis for further genetic studies.