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Updated: Jun 22, 2026

An Allele-specific Gene Expression Assay to Test the Functional Basis of Genetic Associations
Published on: November 3, 2010
The lingering enigma of the allelic exclusion mechanism
Raul Mostoslavsky1, Frederick W Alt, Klaus Rajewsky
1Howard Hughes Medical Institute, The Children's Hospital, Harvard Medical School, Boston, MA 02115, USA.
B lymphocytes produce diverse antibody specificities by "randomly" assembling antibody genes from germline segments. Yet, though each B lymphocyte has multiple allelic loci for the different antibody chains, each clonally derived mature B lymphocyte expresses a single species of antibody with a unique specificity via a process termed allelic exclusion. Despite some progress, the precise mechanism of allelic exclusion remains an enigma.
B lymphocytes produce diverse antibody specificities by "randomly" assembling antibody genes from germline segments. Yet, though each B lymphocyte has multiple allelic loci for the different antibody chains, each clonally derived mature B lymphocyte expresses a single species of antibody with a unique specificity via a process termed allelic exclusion. Despite some progress, the precise mechanism of allelic exclusion remains an enigma.
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