Cloning and characterization of boar epididymal secretory proteins by homology to the human

Reprod Domest Anim. 2003 Apr;38(2):111-8. doi: 10.1046/j.1439-0531.2003.00403.x.


Northern blot analysis suggested that the boar epididymis produces closely related counterparts to human epididymal proteins HE1, HE3, HE4, HE5 and HE12. 'Full-length' cloning by nucleic acid and amino acid sequence similarity was achieved by RT-PCR methods in the case of the porcine counterparts of HE3 and HE4, while the homologues of HE5 and HE12, despite their cross-hybridization during Northern blot analysis, have not yet been cloned. The two novel porcine cDNAs were derived from moderately abundant epididymal mRNAs that were 75 and 83% identical to HE3 and HE4 cDNAs, respectively. To emphasize their relationship to the corresponding HEs, they were named Se3 and Se4 cDNAs. Their open reading frames predicted small secretory proteins with 55% (Se3) and 76% (Se4) conserved amino acids. Monospecific antipeptide antibodies to HE secretory proteins identified He3- and HE12-related proteins on Western blots of porcine epididymal fluid and semen. Both Northern and Western analyses indicated that the Se proteins were produced in a regionalized pattern and accumulated in the cauda fluid.

Publication types

  • Comparative Study
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Amino Acid Sequence
  • Animals
  • Base Sequence
  • Blotting, Northern
  • Blotting, Western
  • Cloning, Molecular*
  • DNA, Complementary / chemistry
  • DNA, Complementary / genetics
  • Epididymal Secretory Proteins / chemistry*
  • Epididymal Secretory Proteins / genetics
  • Epididymal Secretory Proteins / metabolism
  • Epididymis / metabolism
  • Gene Expression Regulation
  • Humans
  • In Situ Hybridization
  • Male
  • Molecular Sequence Data
  • Open Reading Frames
  • RNA, Messenger / metabolism
  • Reverse Transcriptase Polymerase Chain Reaction
  • Sequence Homology
  • Swine / genetics
  • Swine / physiology*


  • DNA, Complementary
  • Epididymal Secretory Proteins
  • RNA, Messenger

Associated data

  • GENBANK/AJ506743
  • GENBANK/AJ506744