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Allelic exclusion

Allelic exclusion

(Science: cell biology, genetics) The process whereby one or more loci on one of the chromosome sets in a diploid cell is inactivated (or destroyed) so that the locus or loci is (are) not expressed in that cell or a clone founded by it.

For example in mammals one of the x chromosome pairs of females is inactivated early in development (see Lyon hypothesis) so that individual cells express only one allelic form of the product of that locus. Since the choice of chromosome to be inactivated is random, different cells express one or other of the x chromosome products resulting in mosaicism.

The process is also known to occur in immunoglobulin genes so that a clone expresses only one of the two possible allelic forms of immunoglobulin.

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Allelic exclusion

Why do B cells undergo allelic exclusion at all...why they dont show normal dominant-recessive pattern

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by jannat
Thu Jan 22, 2015 4:19 am
Forum: Genetics
Topic: Allelic exclusion
Replies: 0
Views: 329

Allelic exclusion

Does anybody have any new articles on the allelic exclusion mechanism? I would be appreciate if smn helps me to find it. At this time, only found articles ...

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by Pecatum
Thu Oct 05, 2006 2:22 pm
Forum: Molecular Biology
Topic: Allelic exclusion
Replies: 1
Views: 1142

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