Mutations in CSPP1, encoding a core centrosomal protein, cause a range of ciliopathy phenotypes in humans.

Abstract

Ciliopathies are characterized by a pattern of multisystem involvement that is consistent with the developmental role of the primary cilium. Within this biological module, mutations in genes that encode components of the cilium and its anchoring structure, the basal body, are the major contributors to both disease causality and modification. However, despite rapid advances in this field, the majority of the genes that drive ciliopathies and the mechanisms that govern the pronounced phenotypic variability of this group of disorders remain poorly understood. Here, we show that mutations in CSPP1, which encodes a core centrosomal protein, are disease causing on the basis of the independent identification of two homozygous truncating mutations in three consanguineous families (one Arab and two Hutterite) affected by variable ciliopathy phenotypes ranging from Joubert syndrome to the more severe Meckel-Gruber syndrome with perinatal lethality and occipital encephalocele. Consistent with the recently described role of CSPP1 in ciliogenesis, we show that mutant fibroblasts from one affected individual have severely impaired ciliogenesis with concomitant defects in sonic hedgehog (SHH) signaling. Our results expand the list of centrosomal proteins implicated in human ciliopathies.

• Authors: Ranad Shaheen, Hanan E Shamseldin, Catrina M Loucks, Mohammed Zain Seidahmed, Shinu Ansari, Mohamed Ibrahim Khalil, Nadya Al-Yacoub, Erica E Davis, Natalie A Mola, Katarzyna Szymanska, Warren Herridge, Albert E Chudley, Bernard N Chodirker, Jeremy Schwartzentruber, Jacek Majewski, Nicholas Katsanis, Coralie Poizat, Colin A Johnson, Jillian Parboosingh, Kym M Boycott, A Micheil Innes, Fowzan S Alkuraya
• Journal: American journal of human genetics (Am J Hum Genet) Vol. 94 Issue 1 Pg. 73-9 (Jan 02 2014) ISSN: 1537-6605 [Electronic] United States
• PMID: 24360803 (Publication Type: Journal Article, Research Support, N.I.H., Extramural, Research Support, Non-U.S. Gov't)
• Copyright: Copyright © 2014 The American Society of Human Genetics. Published by Elsevier Inc. All rights reserved.

Chemical References

• CSPP1 protein, human
• Cell Cycle Proteins
• Microtubule-Associated Proteins

Topics

• Abnormalities, Multiple
• Cell Cycle Proteins (genetics)
• Centrosome (metabolism)
• Cerebellar Diseases (genetics)
• Cerebellum (abnormalities)
• Child
• Cilia (genetics, pathology)
• Ciliary Motility Disorders (genetics)
• Consanguinity
• Encephalocele (genetics)
• Eye Abnormalities (genetics)
• Female
• Homozygote
• Humans
• Infant
• Kidney Diseases, Cystic (genetics)
• Male
• Microtubule-Associated Proteins (genetics)
• Mutation
• Pedigree
• Phenotype
• Polycystic Kidney Diseases (genetics)
• Retina (abnormalities)
• Retinitis Pigmentosa
• Signal Transduction