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Related Experiment Videos

Molecular characterization of bovine V lambda regions

M C Sinclair1, J Gilchrist, R Aitken

  • 1Microbiology Laboratory, University of Glasgow, Scotland.

Journal of Immunology (Baltimore, Md. : 1950)
|September 15, 1995
PubMed
Summary

Researchers identified two main families of bovine V lambda regions, with V lambda 1 dominating the expressed light chain repertoire. A significant portion of germline V lambda 1 genes may be nonfunctional.

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Area of Science:

  • Immunogenetics
  • Molecular Biology
  • Comparative Genomics

Background:

  • The bovine immune system's immunoglobulin light chain repertoire is crucial for adaptive immunity.
  • Understanding the diversity and organization of V lambda genes provides insights into immune system evolution and function.

Purpose of the Study:

  • To isolate and characterize bovine V lambda regions from splenic cDNA.
  • To classify bovine V lambda genes into families and subgroups.
  • To investigate the relationship between germline V lambda genes and expressed sequences.

Main Methods:

  • Inverse PCR technique using primers against constant region sequences.
  • Analysis of nucleotide and protein sequences of isolated V lambda regions.
  • Amplification and characterization of V lambda 1 genes from kidney genomic DNA.

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Main Results:

  • 18 V lambda regions were isolated, classified into two families: V lambda 1 (94%) and V lambda 2 (6%).
  • The dominant V lambda 1 family was further subdivided into V lambda 1a, V lambda 1b, and V lambda 1c subgroups.
  • Complementarity-determining region (CDR) sizes varied, with CDR1 being group-specific and CDR3 showing variability.
  • Analysis of genomic DNA revealed that half of the germline V lambda 1 sequences were not detected in splenic cDNA.

Conclusions:

  • The V lambda 1 family significantly shapes the expressed bovine light chain repertoire.
  • A substantial fraction of bovine germline V lambda segments may be nonfunctional or underexpressed.
  • This study provides a detailed molecular characterization of the bovine V lambda repertoire.