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2013 ; 132
(8
): 865-84
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Identification of 99 novel mutations in a worldwide cohort of 1,056 patients with
a nephronophthisis-related ciliopathy
#MMPMID23559409
Halbritter J
; Porath JD
; Diaz KA
; Braun DA
; Kohl S
; Chaki M
; Allen SJ
; Soliman NA
; Hildebrandt F
; Otto EA
Hum Genet
2013[Aug]; 132
(8
): 865-84
PMID23559409
show ga
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 (NPHP1-NPHP13) 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.
|Adaptor Proteins, Signal Transducing/genetics
[MESH]