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2017 ; 25
(4
): 509-511
Nephropedia Template TP
gab.com Text
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English Wikipedia
Juvenile myelomonocytic leukemia-associated variants are associated with
neo-natal lethal Noonan syndrome
#MMPMID28098151
Mason-Suares H
; Toledo D
; Gekas J
; Lafferty KA
; Meeks N
; Pacheco MC
; Sharpe D
; Mullen TE
; Lebo MS
Eur J Hum Genet
2017[Apr]; 25
(4
): 509-511
PMID28098151
show ga
Gain-of-function variants in some RAS-MAPK pathway genes, including PTPN11 and
NRAS, are associated with RASopathies and/or acquired hematological malignancies,
most notably juvenile myelomonocytic leukemia (JMML). With rare exceptions, the
spectrum of germline variants causing RASopathies does not overlap with the
somatic variants identified in isolated JMML. Studies comparing these variants
suggest a stronger gain-of-function activity in the JMML variants. As JMML
variants have not been identified as germline defects and have a greater impact
on protein function, it has been speculated that they would be embryonic lethal.
Here we identified three variants, which have previously only been identified in
isolated somatic JMML and other sporadic cancers, in four cases with a severe
pre- or neo-natal lethal presentation of Noonan syndrome. These cases support the
hypothesis that these stronger gain-of-function variants are rarely compatible
with life.