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Published on: August 5, 2011
Genomic structure, functional comparison, and tissue distribution of mouse Cd59a and Cd59b
1Harvard Medical School, Laboratory for Membrane Transport, 240 Longwood Ave., C1-607, Boston, Massachusetts 02115, USA.
Summary
Mice possess two CD59 genes, Cd59a and Cd59b, with distinct genomic structures and activities. Cd59b exhibits higher membrane attack complex inhibition than Cd59a, and both show varied tissue distribution and reproductive roles.
Area of Science:
- Immunology
- Genetics
- Molecular Biology
Background:
- CD59 is a key regulator of the complement system, preventing the formation of the membrane attack complex (MAC).
- Mice have two CD59 genes (Cd59a and Cd59b), unlike humans and rats with one.
Purpose of the Study:
- To characterize the genomic structure, comparative activity, and tissue distribution of the two mouse CD59 genes.
- To investigate potential differential roles of Cd59a and Cd59b, especially in reproduction.
Main Methods:
- Analysis of genomic structure, including exon-intron organization and sequence similarity.
- Comparative assessment of MAC formation inhibition activity.
- Tissue distribution analysis using specific polyclonal antibodies.
Main Results:
- Mouse Cd59a and Cd59b genes have distinct genomic structures, with high similarity in exons 2-4 but not exon 1.
- Cd59b demonstrates six times higher inhibitory activity against MAC formation than Cd59a.
- Both genes are widely expressed across tissues, with specific expression patterns in testicular cells (Cd59a in spermatids, Cd59b in mature sperm).
Conclusions:
- Despite broad expression, Cd59a and Cd59b likely have distinct functions.
- Differential roles in reproduction are suggested by their specific expression patterns in testicular cells.
