doi: 10.1007/BF00188800.
Complete cDNA sequence of a rainbow trout IgM gene and evolution of vertebrate IgM constant domains
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- PMID: 8319974
- DOI: 10.1007/BF00188800
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Complete cDNA sequence of a rainbow trout IgM gene and evolution of vertebrate IgM constant domains
Immunogenetics.
1993.
Abstract
A complete cDNA clone encoding secreted IgM molecules was isolated from a spleen cDNA library of rainbow trout (Oncorhynchus mykiss). It encodes the leader peptide, VH, DH, JH, and the whole constant region of the secreted IgM molecule. We also studied the copy number of the IgM gene and an unusual RNA splicing mechanism which generates membrane IgM lacking the CH4 domain in rainbow trout. Amino acid sequence comparison of IgM protein sequences from this fish and other vertebrates indicates that some domains of IgM have evolved at a relatively constant rate. The evolution of salmonid fish including divergence time is discussed.
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