A novel dominant-negative FGFR1 variant causes Hartsfield syndrome by deregulating RAS/ERK1/2 pathway

European Journal of Human Genetics : EJHG
Pietro PalumboMarco Castori

Abstract

Hartsfield syndrome (HS) is an ultrarare developmental disorder mainly featuring holoprosencephaly and ectrodactyly. It is caused by heterozygous or biallelic variants in FGFR1. Recently, a dominant-negative effect was suggested for FGFR1 variants associated with HS. Here, exome sequencing analysis in a 12-year-old boy with HS disclosed a novel de novo heterozygous variant c.1934C>T in FGFR1 predicted to cause the p.(Ala645Val) amino-acid substitution. In order to evaluate whether the variant, changing a highly conserved residue of the kinase domain, affects FGFR1 function, biochemical studies were employed. We measured the FGFR1 receptor activity in FGF2-treated cell lines exogenously expressing wild-type or Ala645Val FGFR1 by monitoring the activation status of FGF2/FGFR1 downstream pathways. Our analysis highlighted that RAS/ERK1/2 signaling was significantly perturbed in cells expressing mutated FGFR1, in comparison with control cells. We also provided preliminary evidence showing a modulation of the autophagic process in cells expressing mutated FGFR1. This study expands the FGFR1 mutational spectrum associated with HS, provides functional evidence further supporting a dominant-negative effect of this category of FGFR1 var...Continue Reading

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Citations

Sep 13, 2019·American Journal of Medical Genetics. Part a·Carolina CourageJohannes R Lemke
May 7, 2020·Journal of the Endocrine Society·Sachiko KobayashiKunihiko Hashimoto

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Methods Mentioned

BETA
exome sequencing
Electrophoresis
PCR

Software Mentioned

Primer express
KAVIAR
PolyPhen
FATHMM
Genomes
MutationAssessor
ESP
ClinVar
EVS
Image J

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