Abstract:
:The identification of genetic variants implicated in human developmental disorders has been revolutionized by second-generation sequencing combined with international pooling of cases. Here, we describe seven individuals who have diverse yet overlapping developmental anomalies, and who all have de novo missense FBXW11 variants identified by whole exome or whole genome sequencing and not reported in the gnomAD database. Their phenotypes include striking neurodevelopmental, digital, jaw, and eye anomalies, and in one individual, features resembling Noonan syndrome, a condition caused by dysregulated RAS signaling. FBXW11 encodes an F-box protein, part of the Skp1-cullin-F-box (SCF) ubiquitin ligase complex, involved in ubiquitination and proteasomal degradation and thus fundamental to many protein regulatory processes. FBXW11 targets include β-catenin and GLI transcription factors, key mediators of Wnt and Hh signaling, respectively, critical to digital, neurological, and eye development. Structural analyses indicate affected residues cluster at the surface of the loops of the substrate-binding domain of FBXW11, and the variants are predicted to destabilize the protein and/or its interactions. In situ hybridization studies on human and zebrafish embryonic tissues demonstrate FBXW11 is expressed in the developing eye, brain, mandibular processes, and limb buds or pectoral fins. Knockdown of the zebrafish FBXW11 orthologs fbxw11a and fbxw11b resulted in embryos with smaller, misshapen, and underdeveloped eyes and abnormal jaw and pectoral fin development. Our findings support the role of FBXW11 in multiple developmental processes, including those involving the brain, eye, digits, and jaw.
journal_name
Am J Hum Genetjournal_title
American journal of human geneticsauthors
Holt RJ,Young RM,Crespo B,Ceroni F,Curry CJ,Bellacchio E,Bax DA,Ciolfi A,Simon M,Fagerberg CR,van Binsbergen E,De Luca A,Memo L,Dobyns WB,Mohammed AA,Clokie SJH,Zazo Seco C,Jiang YH,Sørensen KP,Andersen H,Sullivandoi
10.1016/j.ajhg.2019.07.005subject
Has Abstractpub_date
2019-09-05 00:00:00pages
640-657issue
3eissn
0002-9297issn
1537-6605pii
S0002-9297(19)30268-Xjournal_volume
105pub_type
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