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Sperm-binding fibronectin type II-module proteins are genetically linked and functionally related.

Mahnaz Ekhlasi-Hundrieser1, Bettina Schäfer, Ute Philipp

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Area of Science:

  • Reproductive biology
  • Molecular and cellular biology
  • Protein biochemistry

Background:

  • Fibronectin type II (Fn2) module-containing proteins are present in the male genital tract.
  • These proteins exist in distinct classes, primarily with two or four Fn2 modules, and variants with three modules are found in humans and pigs.

Purpose of the Study:

  • To investigate the relationship and functional similarities/differences of Fn2 module-containing proteins.
  • To understand their expression patterns and sperm-binding mechanisms across species.

Main Methods:

  • Analysis of mRNA and protein expression in human, porcine (Sus scrofa), and rodent reproductive tracts.
  • Genomic sequence analysis to identify gene linkage and synteny.
  • Investigation of sperm membrane binding mechanisms.

Main Results:

  • Adult boars express both ELSPBP1 and pB1 proteins in different epididymal regions under androgenic control.
  • Human and rodent epididymides show alternative expression of either ELSPBP1 or pB1-related proteins.
  • Genomic sequences for ELSPBP1 and pB1 are closely linked, with conserved synteny in humans and pigs, but ELSPBP1 sequences are absent in a syntenic mouse region.
  • Both protein classes bind tightly to sperm membranes via a choline-mediated mechanism.

Conclusions:

  • Fn2 module-containing proteins (ELSPBP1 and pB1) share conserved sperm-binding functions but exhibit species-specific expression patterns in the male genital tract.
  • This suggests a species-specific sequential order in sperm binding, contributing to reproductive processes.