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Related Experiment Videos

Two SP-C genes encoding human pulmonary surfactant proteolipid.

S W Glasser1, T R Korfhagen, C M Perme

  • 1Division of Pulmonary Biology, Children's Hospital, Cincinnati, Ohio 45267-0541.

The Journal of Biological Chemistry
|July 25, 1988
PubMed
Summary

Two distinct human surfactant protein C (SP-C) genes are actively transcribed. Variations in SP-C RNA heterogeneity arise from differential splicing, impacting pulmonary surfactant function.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • Human pulmonary surfactant contains surfactant protein C (SP-C), a hydrophobic peptide crucial for surface activity.
  • SP-C is derived from a larger precursor through proteolytic processing.
  • Understanding SP-C gene structure and expression is vital for respiratory health research.

Purpose of the Study:

  • To determine the nucleotide sequences of human SP-C genes.
  • To investigate the genetic basis of SP-C heterogeneity.
  • To analyze the transcription and splicing of SP-C genes.

Main Methods:

  • Genomic library preparation from human leukocytes.
  • DNA sequencing of SP-C genes.
  • cDNA analysis to identify sequence variations.

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  • Restriction fragment analysis of flanking DNA.

    • Main Results:

    • Identified two distinct human SP-C genes with highly similar nucleotide sequences (1% difference).
    • Both genes contain six exons and five introns, with the hydrophobic peptide encoded in exon 2.
    • Observed heterogeneity in SP-C cDNAs due to an 18-nucleotide deletion and an 8-nucleotide insertion in exon 5, resulting from differential splicing.
    • Confirmed active transcription of both SP-C gene classes.

    Conclusions:

    • Two distinct classes of human SP-C genes are actively transcribed.
    • Differential splicing of SP-C RNA is responsible for observed sequence heterogeneity.
    • These findings provide insights into the genetic regulation of pulmonary surfactant composition.