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2016 ; 116
(20
): 12688-12710
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Functions and Malfunctions of Mammalian DNA-Cytosine Deaminases
#MMPMID27585283
Siriwardena SU
; Chen K
; Bhagwat AS
Chem Rev
2016[Oct]; 116
(20
): 12688-12710
PMID27585283
show ga
The AID/APOBEC family enzymes convert cytosines in single-stranded DNA to
uracils, causing base substitutions and strand breaks. They are induced by
cytokines produced during the body's inflammatory response to infections, and
they help combat infections through diverse mechanisms. AID is essential for the
maturation of antibodies and causes mutations and deletions in antibody genes
through somatic hypermutation (SHM) and class-switch recombination (CSR)
processes. One member of the APOBEC family, APOBEC1, edits mRNA for a protein
involved in lipid transport. Members of the APOBEC3 subfamily in humans
(APOBEC3A, APOBEC3B, APOBEC3C, APOBEC3D, APOBEC3F, APOBEC3G, and APOBEC3H)
inhibit infections of viruses such as HIV-1, HBV, and HCV, and retrotransposition
of endogenous retroelements through mutagenic and nonmutagenic mechanisms. There
is emerging consensus that these enzymes can cause mutations in the cellular
genome at replication forks or within transcription bubbles depending on the
physiological state of the cell and the phase of the cell cycle during which they
are expressed. We describe here the state of knowledge about the structures of
these enzymes, regulation of their expression, and both the advantageous and
deleterious consequences of their expression, including carcinogenesis. We
highlight similarities among them and present a holistic view of their regulation
and function.