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2015 ; 3
(5
): 396-403
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gab.com Text
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Validation of a semiconductor next-generation sequencing assay for the clinical
genetic screening of CFTR
#MMPMID26436105
Trujillano D
; Weiss ME
; Köster J
; Papachristos EB
; Werber M
; Kandaswamy KK
; Marais A
; Eichler S
; Creed J
; Baysal E
; Jaber IY
; Mehaney DA
; Farra C
; Rolfs A
Mol Genet Genomic Med
2015[Sep]; 3
(5
): 396-403
PMID26436105
show ga
Genetic testing for cystic fibrosis and CFTR-related disorders mostly relies on
laborious molecular tools that use Sanger sequencing to scan for mutations in the
CFTR gene. We have explored a more efficient genetic screening strategy based on
next-generation sequencing (NGS) of the CFTR gene. We validated this approach in
a cohort of 177 patients with previously known CFTR mutations and polymorphisms.
Genomic DNA was amplified using the Ion AmpliSeq? CFTR panel. The DNA libraries
were pooled, barcoded, and sequenced using an Ion Torrent PGM sequencer. The
combination of different robust bioinformatics tools allowed us to detect
previously known pathogenic mutations and polymorphisms in the 177 samples,
without detecting spurious pathogenic calls. In summary, the assay achieves a
sensitivity of 94.45% (95% CI: 92% to 96.9%), with a specificity of detecting
nonvariant sites from the CFTR reference sequence of 100% (95% CI: 100% to 100%),
a positive predictive value of 100% (95% CI: 100% to 100%), and a negative
predictive value of 99.99% (95% CI: 99.99% to 100%). In addition, we describe the
observed allelic frequencies of 94 unique definitely and likely pathogenic,
uncertain, and neutral CFTR variants, some of them not previously annotated in
the public databases. Strikingly, a seven exon spanning deletion as well as
several more technically challenging variants such as pathogenic
poly-thymidine-guanine and poly-thymidine (poly-TG-T) tracts were also detected.
Targeted NGS is ready to substitute classical molecular methods to perform
genetic testing on the CFTR gene.