A cis-acting diversification activator both necessary and sufficient for AID-mediated hypermutation.

Abstract:

:Hypermutation of the immunoglobulin (Ig) genes requires Activation Induced cytidine Deaminase (AID) and transcription, but it remains unclear why other transcribed genes of B cells do not mutate. We describe a reporter transgene crippled by hypermutation when inserted into or near the Ig light chain (IgL) locus of the DT40 B cell line yet stably expressed when inserted into other chromosomal positions. Step-wise deletions of the IgL locus revealed that a sequence extending for 9.8 kilobases downstream of the IgL transcription start site confers the hypermutation activity. This sequence, named DIVAC for diversification activator, efficiently activates hypermutation when inserted at non-Ig loci. The results significantly extend previously reported findings on AID-mediated gene diversification. They show by both deletion and insertion analyses that cis-acting sequences predispose neighboring transcription units to hypermutation.

journal_name

PLoS Genet

journal_title

PLoS genetics

authors

Blagodatski A,Batrak V,Schmidl S,Schoetz U,Caldwell RB,Arakawa H,Buerstedde JM

doi

10.1371/journal.pgen.1000332

subject

Has Abstract

pub_date

2009-01-01 00:00:00

pages

e1000332

issue

1

eissn

1553-7390

issn

1553-7404

journal_volume

5

pub_type

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