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2014 ; 211
(13
): 2537-47
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English Wikipedia
Heterozygous splice mutation in PIK3R1 causes human immunodeficiency with
lymphoproliferation due to dominant activation of PI3K
#MMPMID25488983
Lucas CL
; Zhang Y
; Venida A
; Wang Y
; Hughes J
; McElwee J
; Butrick M
; Matthews H
; Price S
; Biancalana M
; Wang X
; Richards M
; Pozos T
; Barlan I
; Ozen A
; Rao VK
; Su HC
; Lenardo MJ
J Exp Med
2014[Dec]; 211
(13
): 2537-47
PMID25488983
show ga
Class IA phosphatidylinositol 3-kinases (PI3K), which generate PIP3 as a signal
for cell growth and proliferation, exist as an intracellular complex of a
catalytic subunit bound to a regulatory subunit. We and others have previously
reported that heterozygous mutations in PIK3CD encoding the p110? catalytic PI3K
subunit cause a unique disorder termed p110?-activating mutations causing
senescent T cells, lymphadenopathy, and immunodeficiency (PASLI) disease. We
report four patients from three families with a similar disease who harbor a
recently reported heterozygous splice site mutation in PIK3R1, which encodes the
p85?, p55?, and p50? regulatory PI3K subunits. These patients suffer from
recurrent sinopulmonary infections and lymphoproliferation, exhibit hyperactive
PI3K signaling, and have prominent expansion and skewing of peripheral blood
CD8(+) T cells toward terminally differentiated senescent effector cells with
short telomeres. The PIK3R1 splice site mutation causes skipping of an exon,
corresponding to loss of amino acid residues 434-475 in the inter-SH2 domain. The
mutant p85? protein is expressed at low levels in patient cells and activates
PI3K signaling when overexpressed in T cells from healthy subjects due to
qualitative and quantitative binding changes in the p85?-p110? complex and
failure of the C-terminal region to properly inhibit p110? catalytic activity.