Structure of mink immunoglobulin gamma chain cDNA.
Two cDNA clones, encoding mink Ig gamma chains were characterized. The pIGG47 clone contains a part of the leader segment, VDJ and C regions, and pIGG14 contains a part of the J and a complete C region. The clones differ by only four nucleotides in the C region, and they most probably represent allelic variants of the same gene. The V gene segment of pIGG47 was found to be highly similar to human VHIII subgroup sequences; there was 86-87% similarity for the whole V gene segment and 91% for the VHIII specific regions (codons 65-87). Southern blot analysis demonstrated that a high proportion of mink VH genes is VHIII related. The V gene segment used as a probe revealed 19-23 bands in mink DNA under stringent conditions. This is in agreement with our previous data showing that a high proportion of mink Ig contains an 'alternative' binding site for protein A, a feature common to VHIII-related molecules. According to Southern blot analysis there may be 5-7 C gamma genes at the mink IgH locus.
Institute of Cytology and Genetics, Novosibirsk, Russia.
A M
AM
Najakshin
E S
ES
Belousov
Alabyev BYu
J
J
Christensen
T
T
Storgaard
B
B
Aasted
A V
AV
Taranin
D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D003001:Cloning, Molecular; D018076:DNA, Complementary / Q000302:isolation & purification*; D005803:Genes, Immunoglobulin; D006801:Humans; D007143:Immunoglobulin Heavy Chains / Q000235:genetics; D007135:Immunoglobulin Variable Region / Q000235:genetics; D007142:Immunoglobulin gamma-Chains / Q000737:chemistry / Q000235:genetics* / Q000302:isolation & purification*; D051379:Mice; D008907:Mink; D008969:Molecular Sequence Data; D011817:Rabbits; D013154:Spleen / Q000737:chemistry
D018076:DNA, Complementary; D007143:Immunoglobulin Heavy Chains; D007135:Immunoglobulin Variable Region; D007142:Immunoglobulin gamma-Chains