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Identification of 99 novel mutations in a worldwide cohort of 1,056 patients with a nephronophthisis-related ciliopathy

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Abstract

Nephronophthisis-related ciliopathies (NPHP-RC) are autosomal-recessive cystic kidney diseases. More than 13 genes are implicated in its pathogenesis to date, accounting for only 40 % of all cases. High-throughput mutation screenings of large patient cohorts represent a powerful tool for diagnostics and identification of novel NPHP genes. We here performed a new high-throughput mutation analysis method to study 13 established NPHP genes (NPHP1NPHP13) in a worldwide cohort of 1,056 patients diagnosed with NPHP-RC. We first applied multiplexed PCR-based amplification using Fluidigm Access-Array™ technology followed by barcoding and next-generation resequencing on an Illumina platform. As a result, we established the molecular diagnosis in 127/1,056 independent individuals (12.0 %) and identified a single heterozygous truncating mutation in an additional 31 individuals (2.9 %). Altogether, we detected 159 different mutations in 11 out of 13 different NPHP genes, 99 of which were novel. Phenotypically most remarkable were two patients with truncating mutations in INVS/NPHP2 who did not present as infants and did not exhibit extrarenal manifestations. In addition, we present the first case of Caroli disease due to mutations in WDR19/NPHP13 and the second case ever with a recessive mutation in GLIS2/NPHP7. This study represents the most comprehensive mutation analysis in NPHP-RC patients, identifying the largest number of novel mutations in a single study worldwide.

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Acknowledgments

The authors sincerely thank the affected individuals and their families for participation in this study. We further thank all the physicians of the “Gesellschaft für pädiatrische Nephrologie (GPN)” study group for participation. This work was supported by a grant from the National Institutes of Health to E.O. (RC4-DK090917).

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Correspondence to Edgar A. Otto.

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J. Halbritter and J. D. Porath contributed equally to this work.

The contributing members of the GPN study group are listed in the Appendix.

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Contributing members of the GPN study group are listed as follows: F Yalcinkaya (Ankara, Turkey); S Bakkaloglu (Ankara, Turkey); F Ozaltin (Ankara, Turkey); E Comak (Antalya, Turkey); F Krull (Aurich, Germany); Schmitz-Hübner (Bad Oeynhausen, Germany); H Rupprecht (Bayreuth, Germany); D Muller (Berlin, Germany); P Dahlem (Coburg, Germany); B Hoppe (Cologne, Germany); M Wolfe (Cologne, Germany); M Weber (Cologne, Germany); U Vester (Essen, Germany); K Bonzel (Essen, Germany); J Nikolay (Furth, Germany); I Hansmann (Halle, Germany); M Wiefel (Hamburg, Germany); U Orth (Hamburg, Germany); H Pfleiderer (Hamm, Germany); L Pape (Hannover, Germany); Morlot (Hannover, Germany); J Ehrich (Hannover, Germany); B Tonshoff (Heidelberg, Germany); F Schindera (Karlsruhe, Germany); J Hoefele (Martinsried, Germany); M Griebel (Munich, Germany); E Broeking (Münster, Germany); M Konrad (Münster, Germany); M Radke (Potsdam, Germany); M Brandis (Ravensburg, Germany); A Kirchhoff (Wurzburg, Germany); V Feygina (Brooklyn, NY, USA); J Springate (Buffalo, NY, USA); S Ahmadzdeh (Burlington, VT, USA); D Gipson (Chapel Hill, NC, USA); A Becker (Dallas, TX, USA); V Dharnidharka (Gainesville, FL, USA); P Mark (Grand Rapids, MI, USA); P Srivaths (Houston, TX, USA); A Wilson (Indianapolis, IN, USA); E Kamil (Los Angeles, CA, USA); S Why (Milwaukee, WI, USA); C Pan (Milwaukee, WI, USA); C Kashtan (Minneapolis, MN, USA); C D’Alessandri (New Haven, CT, USA); H Trachtman (Ney York city, NY, USA); B Kaplan (Philadelphia, PA, USA); M Joseph (Phoenix, AZ, USA); R Weiss (Valhalla, NY, USA); S Thomas (Ann Arbor, MI, USA); L Newberry (Aurora, CO, USA); M Koyun (Cairo, Egypt); H Fathy (Alexandria, Egypt); A Rybi—Szuminska (Bialystok, Poland); M Szczepanska (Zabrze, Poland); Z Dolezel (Brno, Czech Republic); M Malina (Prague, Czech Republic); T Seeman (Prague, Czech Republic); T Honzik (Prague, Czech Republic); P Ferreira (Calgary, Canada); M Ferguson (Halifax, Canada); E Harvey (Toronto, Canada); K Chong (Toronto, Canada); R Sandford (Cambridge, UK); D Josifova (London, UK); D Bockenhauer (London, UK); J Sayer (Newcastle upon Tyne, UK); C Johnson (Yorkshire, UK); P Senguttuvan (Chennai, India); I Pela (Firenze, Italy); N Knops (Leuven, Belgium); T Levart (Ljubljana, Slovenia); T Neuhaus (Luzern, Switzerland); C Ayuso (Madrid, Spain); A Kindi (Muscat, Sultanate of Oman); N Knoers (Nijmegen, The Netherlands); C Antignac (Paris, France); W Radauer (Salzburg, Austria); C Genzani (Sao Paulo, Brazil); U Berg (Stockhom, Sweden); C Klingenberg (Tromsø, Norway); C Jones (Victoria, Australia); R Savarirayan (Victoria, Australia); J Kausman (Victoria, Australia).

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Halbritter, J., Porath, J.D., Diaz, K.A. et al. Identification of 99 novel mutations in a worldwide cohort of 1,056 patients with a nephronophthisis-related ciliopathy. Hum Genet 132, 865–884 (2013). https://doi.org/10.1007/s00439-013-1297-0

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