Human Molecular Genetics, Vol 7, 27-31, Copyright © 1998 by Oxford University Press
S Wiltshire, S Bhattacharyya, JA Faux, NI Leaves, SE Daniels, MF Moffatt, A James, AW Musk and WO Cookson
Immunoglobulins play an essential part in the immune system, and
immunoglobulin deficiencies can have profound medical consequences. The
genetic control and regulation of the immunoglobulin response is therefore
of interest. Previous investigations have identified a number of loci
influencing total and specific IgE levels. In this study, 80 nuclear
families have been examined for linkage of total serum IgA, IgG and IgM
levels to a genome-wide panel of microsatellite markers. Potential
quantitative trait loci influencing IgA levels have been identified on
chromosomes 10 and 13, and possible loci influencing IgG levels were found
on chromosomes 3 and 13. No significant linkages to IgM levels were found.
The linkage of IgA on chromosome 13 was to a marker previously linked to
IgE responses (atopy). Linkage to IgG was in the same region but to a more
distal marker. None of the factors known to influence immunoglobulin
expression map to the loci identified in the present study. These loci are
therefore likely to contain previously unrecognized components of the
immunoregulatory system.
ARTICLES
A genome scan for loci influencing total serum immunoglobulin levels: possible linkage of IgA to the chromosome 13 atopy locus
Asthma Genetics Group, Nuffield Department of Clinical Medicine, University of Oxford, John Radcliffe Hospital, Oxford OX3 9DU, UK.
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