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Updated: May 2, 2026

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Human SP-A: then and now

J Floros1, A M Karinch

  • 1Department of Cellular and Molecular Physiology, Pennsylvania State University College of Medicine, Hershey 17033.

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Human surfactant-associated protein A (SP-A) gene complexity has rapidly increased over ten years. Future research will focus on understanding the physiological significance of this genetic complexity.

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Area of Science:

  • Genetics
  • Molecular Biology
  • Biochemistry

Background:

  • Human surfactant-associated protein A (SP-A) plays a crucial role in lung function.
  • Early research (1984-1988) focused on biochemical characterization and precursor identification.
  • Initial molecular studies suggested the presence of two SP-A genes.

Purpose of the Study:

  • To review the rapid advancements in understanding human SP-A at the gene and protein levels.
  • To highlight the emerging complexity of SP-A gene structure and variants.
  • To identify future research directions concerning SP-A genetic complexity.

Main Methods:

  • Biochemical characterization of SP-A protein.
  • Gene sequencing of SP-A genomic DNA and cDNAs.
  • Identification and description of SP-A pseudogenes and allelic variants.

Main Results:

  • Over a decade, understanding of SP-A has significantly evolved.
  • Two SP-A precursors and two SP-A genes were identified.
  • Subsequent studies revealed increasing complexity, including alternative splicing and sequence heterogeneity.

Conclusions:

  • The human SP-A gene system is more complex than initially thought.
  • This complexity involves alternative splicing, allelic variants, and sequence heterogeneity.
  • Determining the physiological significance of SP-A genetic complexity is a key future challenge.