Human Genetics

, Volume 87, Issue 6, pp 642–648 | Cite as

The human transmembrane secretory component (poly-Ig receptor): molecular cloning, restriction fragment length polymorphism and chromosomal sublocalization

  • P. Krajči
  • K. H. Grzeschik
  • A. H. M. Geurts van Kessel
  • B. Olaisen
  • P. Brandtzaeg
Original Investigations


The human transmembrane secretory component (SC) mediates glandular translocation of polymeric IgA and IgM into exocrine secretions. A 2898-bp cDNA clone, encoding the entire sequence of the human transmembrane SC, was isolated from a colonic adenocarcinoma cell line cDNA library. The deduced amino-acid sequence had a length of 764 residues and showed an overall similarity of 56% and 64% with the rabbit and rat counterpart, respectively. A restriction fragment length polymorphism (RFLP) was found with PvuII, revealing a two-alle RFLP with an autosomal codominant inheritance pattern and allele frequencies of 0.65 and 0.35. Southern blot analysis of human-rodent somatic hybrid panels, including hybrids with translocation chromosomes carrying different parts of chromosome 1, assigned the SC gene to 1q31-q42, thus confirming a previously reported provisional assignment.


cDNA Library Restriction Fragment Length Polymorphism Southern Blot Analysis Somatic Hybrid Translocation Chromosome 
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Copyright information

© Springer-Verlag 1991

Authors and Affiliations

  • P. Krajči
    • 1
  • K. H. Grzeschik
    • 2
  • A. H. M. Geurts van Kessel
    • 3
  • B. Olaisen
    • 4
  • P. Brandtzaeg
    • 1
  1. 1.Laboratory for Immunohistochemistry and Immunopathology (LIIPAT)Institute of Pathology, University of Oslo The National HospitalOsloNorway
  2. 2.Institut für Humangenetik der UniversitätMarburgGermany
  3. 3.Department of Human GeneticsUniversity Hospital NijmegenHB NijmegenThe Netherlands
  4. 4.Institute for Forensic Medicine, University of Oslo, The National HospitalOsloNorway

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