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Genetic Defects in TAPT1 Disrupt Ciliogenesis and Cause a Complex Lethal Osteochondrodysplasia

Sofie Symoens, Aileen M. Barnes, Charlotte Gistelinck, Fransiska Malfait, Brecht Guillemyn, Wouter Steyaert, Delfien Syx, Sanne D'Hondt, Martine Biervliet, Julie De Backer, Eckhard P. Witten, Sergey Leikin, Elena Makareeva, Gabriele Gillessen-Kaesbach, Ann Huysseune, Kris Vleminckx, Andy Willaert, Anne De Paepe, Joan C. Marini, Paul J. Coucke*

*Korrespondierende/r Autor/-in für diese Arbeit

Abstract

The evolutionarily conserved transmembrane anterior posterior transformation 1 protein, encoded by TAPT1, is involved in murine axial skeletal patterning, but its cellular function remains unknown. Our study demonstrates that TAPT1 mutations underlie a complex congenital syndrome, showing clinical overlap between lethal skeletal dysplasias and ciliopathies. This syndrome is characterized by fetal lethality, severe hypomineralization of the entire skeleton and intra-uterine fractures, and multiple congenital developmental anomalies affecting the brain, lungs, and kidneys. We establish that wild-type TAPT1 localizes to the centrosome and/or ciliary basal body, whereas defective TAPT1 mislocalizes to the cytoplasm and disrupts Golgi morphology and trafficking and normal primary cilium formation. Knockdown of tapt1b in zebrafish induces severe craniofacial cartilage malformations and delayed ossification, which is shown to be associated with aberrant differentiation of cranial neural crest cells.

OriginalspracheEnglisch
ZeitschriftAmerican Journal of Human Genetics
Jahrgang97
Ausgabenummer4
Seiten (von - bis)521-534
Seitenumfang14
ISSN0002-9297
DOIs
PublikationsstatusVeröffentlicht - 2015

Fördermittel

We wish to thank P. Tapaneeyaphan, J. Weytens, P. Vermassen, L. Demuynck, P. Simoens, H. De Saffel and M. Soenens for excellent technical assistance. We are grateful to E. Parthoens and Dr. C. Guérin for access to the BioImaging Core, Ghent Platform, VIB. A.M.B. and J.C.M. acknowledge the NICHD Microscopy and Imaging Core. F.M. is a senior clinical investigator at the Fund for Scientific Research-Flanders. Contract grants include FWO grant number G.0171.05 to A.D.P. and Methusalem grant number 08/01M01108 to A.D.P. and NICHD, NIH Intramural Funding went to J.C.M. This work was also supported by funding from the Belgian Science Policy Office Interuniversity Attraction Poles (BELSPO-IAP) program through the project IAP P7/43-BeMGI. The Leica TCS LSI Super Zoom confocal microscope is supported by the Hercules Foundation, Flanders (grant AUGE/11/14).

UN SDGs

Dieser Output leistet einen Beitrag zu folgendem(n) Ziel(en) für nachhaltige Entwicklung

  1. SDG 3 – Gesundheit und Wohlergehen
    SDG 3 – Gesundheit und Wohlergehen

Strategische Forschungsbereiche und Zentren

  • Querschnittsbereich: Medizinische Genetik

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