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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 J+Am+Soc+Nephrol
2014 ; 25
(12
): 2740-51
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Improving mutation screening in familial hematuric nephropathies through next
generation sequencing
#MMPMID24854265
Morinière V
; Dahan K
; Hilbert P
; Lison M
; Lebbah S
; Topa A
; Bole-Feysot C
; Pruvost S
; Nitschke P
; Plaisier E
; Knebelmann B
; Macher MA
; Noel LH
; Gubler MC
; Antignac C
; Heidet L
J Am Soc Nephrol
2014[Dec]; 25
(12
): 2740-51
PMID24854265
show ga
Alport syndrome is an inherited nephropathy associated with mutations in genes
encoding type IV collagen chains present in the glomerular basement membrane.
COL4A5 mutations are associated with the major X-linked form of the disease, and
COL4A3 and COL4A4 mutations are associated with autosomal recessive and dominant
forms (thought to be involved in 15% and 1%-5% of the families, respectively) and
benign familial hematuria. Mutation screening of these three large genes is
time-consuming and expensive. Here, we carried out a combination of multiplex
PCR, amplicon quantification, and next generation sequencing (NGS) analysis of
three genes in 101 unrelated patients. We identified 88 mutations and 6
variations of unknown significance on 116 alleles in 83 patients. Two additional
indel mutations were found only by secondary Sanger sequencing, but they were
easily identified retrospectively with the web-based sequence visualization tool
Integrative Genomics Viewer. Altogether, 75 mutations were novel. Sequencing the
three genes simultaneously was particularly advantageous as the mode of
inheritance could not be determined with certainty in many instances. The
proportion of mutations in COL4A3 and COL4A4 was notably high, and the autosomal
dominant forms of Alport syndrome appear more frequently than reported
previously. Finally, this approach allowed the identification of large COL4A3 and
COL4A4 rearrangements not described previously. We conclude that NGS is
efficient, reduces screening time and cost, and facilitates the provision of
appropriate genetic counseling in Alport syndrome.