Activation-induced deaminase and its splice variants associate with trisomy 12 in chronic lymphocytic leukemia.

Abstract:

:Activation-induced cytidine deaminase (AID) is a mutator enzyme essential for somatic hypermutation (SHM) and class switch recombination (CSR) during effective adaptive immune responses. Its aberrant expression and activity have been detected in lymphomas, leukemias, and solid tumors. In chronic lymphocytic leukemia (CLL) increased expression of alternatively spliced AID variants has been documented. We used real-time RT-PCR to quantify the expression of AID and its alternatively spliced transcripts (AIDΔE4a, AIDΔE4, AIDivs3, and AIDΔE3E4) in 149 CLL patients and correlated this expression to prognostic markers including recurrent chromosomal aberrations, the presence of complex karyotype, mutation status of the immunoglobulin heavy chain variable gene, and recurrent mutations. We report a previously unappreciated association between higher AID transcript levels and trisomy of chromosome 12. Functional analysis of AID splice variants revealed loss of their activity with respect to SHM, CSR, and induction of double-strand DNA breaks. In silico modeling provided insight into the molecular interactions and structural dynamics of wild-type AID and a shortened AID variant closely resembling AIDΔE4, confirming its loss-of-function phenotype.

journal_name

Ann Hematol

journal_title

Annals of hematology

authors

Zaprazna K,Reblova K,Svobodova V,Radova L,Bystry V,Baloun J,Durechova K,Tom N,Loja T,Buresova M,Stranska K,Oltova A,Doubek M,Atchison ML,Trbusek M,Malcikova J,Pospisilova S

doi

10.1007/s00277-018-3520-5

subject

Has Abstract

pub_date

2019-02-01 00:00:00

pages

423-435

issue

2

eissn

0939-5555

issn

1432-0584

pii

10.1007/s00277-018-3520-5

journal_volume

98

pub_type

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