Whole-exome sequencing links a variant in DHDDS to retinitis pigmentosa

Stephan Züchner, Julia Dallman, Rong Wen, Gary Beecham, Adam Naj, Amjad Farooq, Martin A. Kohli, Patrice L. Whitehead, William Hulme, Ioanna Konidari, Yvonne J.K. Edwards, Guiqing Cai, Inga Peter, David Seo, Joseph D. Buxbaum, Jonathan L. Haines, Susan Blanton, Juan Young, Eduardo Alfonso, Jeffery M. VanceByron L. Lam, Margaret A. Peričak-Vance

Research output: Contribution to journalArticle

108 Scopus citations

Abstract

Increasingly, mutations in genes causing Mendelian disease will be supported by individual and small families only; however, exome sequencing studies have thus far focused on syndromic phenotypes characterized by low locus heterogeneity. In contrast, retinitis pigmentosa (RP) is caused by >50 known genes, which still explain only half of the clinical cases. In a single, one-generation, nonsyndromic RP family, we have identified a gene, dehydrodolichol diphosphate synthase (DHDDS), demonstrating the power of combining whole-exome sequencing with rapid in vivo studies. DHDDS is a highly conserved essential enzyme for dolichol synthesis, permitting global N-linked glycosylation. Zebrafish studies showed virtually identical photoreceptor defects as observed with N-linked glycosylation-interfering mutations in the light-sensing protein rhodopsin. The identified Lys42Glu variant likely arose from an ancestral founder, because eight of the nine identified alleles in 27,174 control chromosomes were of confirmed Ashkenazi Jewish ethnicity. These findings demonstrate the power of exome sequencing linked to functional studies when faced with challenging study designs and, importantly, link RP to the pathways of N-linked glycosylation, which promise new avenues for therapeutic interventions.

Original languageEnglish (US)
Pages (from-to)201-206
Number of pages6
JournalAmerican journal of human genetics
Volume88
Issue number2
DOIs
StatePublished - Feb 11 2011

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ASJC Scopus subject areas

  • Genetics
  • Genetics(clinical)

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