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Current Topics in Microbiology and Immunology (Paperback, Softcover reprint of the original 1st ed. 1977)
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Current Topics in Microbiology and Immunology (Paperback, Softcover reprint of the original 1st ed. 1977)
Series: Current Topics in Microbiology and Immunology, 76
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Immunoglobulin gene expression appears to include a number of
unique features (Cohn, 1971; Gaily and Edelman, 1972; Hood et aI. ,
1975). First, a variety of genetic and protein structural evidence
suggests that two discrete genes - both a variable region gene and
a constant region gene - specify each heavy chain and each light
chain. This constitutes the twogene-one polypeptide hypothesis.
Second, a single differentiated lymphocyte or plasma cell appears
to express only one heavy chain allele and one light chain allele
at a time. This is the only example of allelic exclusion known in
mammalian cells except for X chromosome inactivation. Third, during
the course of lymphocyte differentiation, there may be a switch of
the heavy chain constant region gene expression but no change in
the heavy chain variable region gene expression. Rarely, normal or
malignant cells have been found which express two different heavy
chain subclasses simul taneously (e. g. see Sledge et aI. , 1976).
Fourth, the vast number of different antibodies which can be made
by an individual animal has raised the question of whether the
generation of diversity occurs during evolution or within the
animal, i. e. germ line vs somatic variation. Other aspects of
immunoglobulin gene ex pression may be similar to regulation of
gene expression in many eukaryotic cells.
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