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TTC21B contributes both causal and modifying alleles across the ciliopathy spectrum

2011; Nature Portfolio; Volume: 43; Issue: 3 Linguagem: Inglês

10.1038/ng.756

1546-1718

Erica E. Davis, Qi Zhang, Qin Liu, Bill H. Diplas, Lisa Davey, Jane Hartley, Corinne Stoetzel, Katarzyna Szymańska, Gokul Ramaswami, Clare V. Logan, Donna M. Muzny, Alice Young, David A. Wheeler, Pedro Cruz, Margaret Morgan, Lora Lewis, Praveen F. Cherukuri, Baishali Maskeri, Nancy F. Hansen, James C. Mullikin, Robert W. Blakesley, Gerard G. Bouffard, Gàbor Gyapay, Susanne Rieger, Burkhard Tönshoff, Ilse Kern, Neveen A. Soliman, Thomas J. Neuhaus, Kathryn J. Swoboda, Hülya Kayserili, Tomas E Gallagher, Richard A. Lewis, Carsten Bergmann, Edgar A. Otto, Sophie Saunier, Peter Scambler, Philip L. Beales, Joseph G. Gleeson, Eamonn R. Maher, Tania Attié‐Bitach, Hélène Dollfus, Colin A. Johnson, Eric D. Green, Richard A. Gibbs, Friedhelm Hildebrandt, Eric A. Pierce, Nicholas Katsanis,

Protist diversity and phylogeny

Nicholas Katsanis and colleagues show that biallelic mutations in TTC21B, encoding the retrograde intraflagellar transport protein IFT139, are associated with diverse ciliopathy phenotypes in humans. They further show that pathogenic alleles of TTC21B are present in as many as 5% of ciliopathy cases, supporting an oligogenic model of disease. Ciliary dysfunction leads to a broad range of overlapping phenotypes, collectively termed ciliopathies. This grouping is underscored by genetic overlap, where causal genes can also contribute modifier alleles to clinically distinct disorders. Here we show that mutations in TTC21B, which encodes the retrograde intraflagellar transport protein IFT139, cause both isolated nephronophthisis and syndromic Jeune asphyxiating thoracic dystrophy. Moreover, although resequencing of TTC21B in a large, clinically diverse ciliopathy cohort and matched controls showed a similar frequency of rare changes, in vivo and in vitro evaluations showed a significant enrichment of pathogenic alleles in cases (P < 0.003), suggesting that TTC21B contributes pathogenic alleles to ∼5% of ciliopathy cases. Our data illustrate how genetic lesions can be both causally associated with diverse ciliopathies and interact in trans with other disease-causing genes and highlight how saturated resequencing followed by functional analysis of all variants informs the genetic architecture of inherited disorders.