TY - JOUR
T1 - Expanding the clinical spectrum of recessive truncating mutations of KLHL7 to a Bohring-Opitz-like phenotype
AU - Bruel, Ange-Line
AU - Bigoni, Stefania
AU - Kennedy, Joanna
AU - Whiteford, Margo
AU - Buxton, Chris
AU - Parmeggiani, Giulia
AU - Wherlock, Matt
AU - Woodward, Geoff
AU - Greenslade, Mark
AU - Williams, Maggie
AU - St-Onge, Judith
AU - Ferlini, Alessandra
AU - Garani, Giampaolo
AU - Ballardini, Elisa
AU - van Bon, Bregje W.
AU - Acuna-Hidalgo, Rocio
AU - Bohring, Axel
AU - Deleuze, Jean-Francois
AU - Boland, Anne
AU - Meyer, Vincent
AU - Olaso, Robert
AU - Ginglinger, Emmanuelle
AU - Riviere, Jean-Baptiste
AU - Brunner, Han G.
AU - Hoischen, Alexander
AU - Newbury-Ecob, Ruth
AU - Faivre, Laurence
AU - Thauvin-Robinet, Christel
AU - Thevenon, Julien
AU - DDD Study
PY - 2017/12
Y1 - 2017/12
N2 - Background Bohring-Opitz syndrome (BOS) is a rare genetic disorder characterised by a recognisable craniofacial appearance and a typical 'BOS' posture. BOS is caused by sporadic mutations of ASXL1. However, several typical patients with BOS have no molecular diagnosis, suggesting clinical and genetic heterogeneity.Objectives To expand the phenotypical spectrum of autosomal recessive variants of KLHL7, reported as causing Crisponi syndrome/cold-induced sweating syndrome type 1 (CS/CISS1)-like syndrome.Methods We performed whole-exome sequencing in two families with a suspected recessive mode of inheritance. We used the Matchmaker Exchange initiative to identify additional patients.Results Here, we report six patients with microcephaly, facial dysmorphism, including exophthalmos, nevus flammeus of the glabella and joint contractures with a suspected BOS posture in five out of six patients. We identified autosomal recessive truncating mutations in the KLHL7 gene. KLHL7 encodes a BTB-kelch protein implicated in the cell cycle and in protein degradation by the ubiquitin-proteasome pathway. Recently, biallelic mutations in the KLHL7 gene were reported in four families and associated with CS/CISS1, characterised by clinical features overlapping with our patients.Conclusion We have expanded the clinical spectrum of KLHL7 autosomal recessive variants by describing a syndrome with features overlapping CS/CISS1 and BOS.
AB - Background Bohring-Opitz syndrome (BOS) is a rare genetic disorder characterised by a recognisable craniofacial appearance and a typical 'BOS' posture. BOS is caused by sporadic mutations of ASXL1. However, several typical patients with BOS have no molecular diagnosis, suggesting clinical and genetic heterogeneity.Objectives To expand the phenotypical spectrum of autosomal recessive variants of KLHL7, reported as causing Crisponi syndrome/cold-induced sweating syndrome type 1 (CS/CISS1)-like syndrome.Methods We performed whole-exome sequencing in two families with a suspected recessive mode of inheritance. We used the Matchmaker Exchange initiative to identify additional patients.Results Here, we report six patients with microcephaly, facial dysmorphism, including exophthalmos, nevus flammeus of the glabella and joint contractures with a suspected BOS posture in five out of six patients. We identified autosomal recessive truncating mutations in the KLHL7 gene. KLHL7 encodes a BTB-kelch protein implicated in the cell cycle and in protein degradation by the ubiquitin-proteasome pathway. Recently, biallelic mutations in the KLHL7 gene were reported in four families and associated with CS/CISS1, characterised by clinical features overlapping with our patients.Conclusion We have expanded the clinical spectrum of KLHL7 autosomal recessive variants by describing a syndrome with features overlapping CS/CISS1 and BOS.
KW - DOMINANT RETINITIS-PIGMENTOSA
KW - BAINBRIDGE-ROPERS SYNDROME
KW - PROTEIN
KW - LIGASE
KW - CANCER
KW - ONSET
U2 - 10.1136/jmedgenet-2017-104748
DO - 10.1136/jmedgenet-2017-104748
M3 - Article
SN - 0022-2593
VL - 54
SP - 830
EP - 835
JO - Journal of Medical Genetics
JF - Journal of Medical Genetics
IS - 12
ER -