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Heterozygous truncating variants in SUFU cause congenital ocular motor apraxia

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Item Type:Article
Title:Heterozygous truncating variants in SUFU cause congenital ocular motor apraxia
Creators Name:Schröder, S. and Li, Y. and Yigit, G. and Altmüller, J. and Bader, I. and Bevot, A. and Biskup, S. and Dreha-Kulaczewski, S. and Korenke, C.G. and Kottke, R. and Mayr, J.A. and Preisel, M. and Toelle, S.P. and Wente-Schulz, S. and Wortmann, S.B. and Hahn, H. and Boltshauser, E. and Uhmann, A. and Wollnik, B. and Brockmann, K.
Abstract:PURPOSE: This study aimed to delineate the genetic basis of congenital ocular motor apraxia (COMA) in patients not otherwise classifiable. METHODS: We compiled clinical and neuroimaging data of individuals from six unrelated families with distinct clinical features of COMA who do not share common diagnostic characteristics of Joubert syndrome or other known genetic conditions associated with COMA. We used exome sequencing to identify pathogenic variants and functional studies in patient-derived fibroblasts. RESULTS: In 15 individuals, we detected familial as well as de novo heterozygous truncating causative variants in the Suppressor of Fused (SUFU) gene, a negative regulator of the Hedgehog (HH) signaling pathway. Functional studies showed no differences in cilia occurrence, morphology, or localization of ciliary proteins, such as smoothened. However, analysis of expression of HH signaling target genes detected a significant increase in the general signaling activity in COMA patient-derived fibroblasts compared with control cells. We observed higher basal HH signaling activity resulting in increased basal expression levels of GLI1, GLI2, GLI3, and Patched1. Neuroimaging revealed subtle cerebellar changes, but no full-blown molar tooth sign. CONCLUSION: Taken together, our data imply that the clinical phenotype associated with heterozygous truncating germline variants in SUFU is a forme fruste of Joubert syndrome.
Keywords:SUFU, Congenital Ocular Motor Apraxia, COMA, Sonic Hedgehog, Joubert Syndrome
Source:Genetics in Medicine
Publisher:Nature Publishing Group
Page Range:341-351
Date:February 2021
Official Publication:https://doi.org/10.1038/s41436-020-00979-w
PubMed:View item in PubMed

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