Nucleic Acids Research, Vol 25, Issue 10 1913-1919, Copyright © 1997 by Oxford University Press
CJ Jolly, N Klix and MS Neuberger
Hypermutation of immunoglobulin genes is a key process in antibody
diversification. Little is known about the mechanism, but the availability
of rapid facile assays for monitoring immunoglobulin hypermutation would
greatly aid the development of culture systems for hypermutating B cells as
well as the screening for individuals deficient in the process. Here we
describe two such assays. The first exploits the non-randomness of
hypermutation. The existence of a mutational hotspot in the Ser31 codon of
a transgenic immunoglobulin V gene allowed us to use PCR to detect
transgene hypermutation and identify cell populations in which this
mutation had occurred. For animals that do not carry immunoglobulin
transgenes, we exploited the fact that hypermutation extends into the
region flanking the 3'-side of the rearranged J segments. We show that PCR
amplification of the 3'- flank of VDJH rearrangements that involve members
of the abundantly- used VHJ558 family provides a large database of
mutations where the germline counterpart is unequivocally known. This assay
was particularly useful for analysing endogenous immunoglobulin gene
hypermutation in several mouse strains. As a rapid assay for monitoring
mutation in the JH flanking region, we show that one can exploit the fact
that, following denaturation/renaturation, the PCR amplified JH flanking
region DNA from germinal centre B cells yields mismatched heteroduplexes
which can be quantified in a filter binding assay using the bacterial
mismatch repair protein MutS -Wagner et al. (1995) Nucleic Acids Res. 23,
3944-3948-. Such assays enabled us, by example, to show that antibody
hypermutation proceeds in the absence of the p53 tumour suppressor gene
product.
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Rapid methods for the analysis of immunoglobulin gene hypermutation: application to transgenic and gene targeted mice
Medical Research Council Laboratory of Molecular Biology, Hills Road, Cambridge CB2 2QH, UK. ccj@mrc-lmb.cam.ac.ui
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