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2015 ; 9
(ä): 33
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Next-generation sequencing using a pre-designed gene panel for the molecular
diagnosis of congenital disorders in pediatric patients
#MMPMID26666243
Lim EC
; Brett M
; Lai AH
; Lee SP
; Tan ES
; Jamuar SS
; Ng IS
; Tan EC
Hum Genomics
2015[Dec]; 9
(ä): 33
PMID26666243
show ga
BACKGROUND: Next-generation sequencing (NGS) has revolutionized genetic research
and offers enormous potential for clinical application. Sequencing the exome has
the advantage of casting the net wide for all known coding regions while targeted
gene panel sequencing provides enhanced sequencing depths and can be designed to
avoid incidental findings in adult-onset conditions. A HaloPlex panel consisting
of 180 genes within commonly altered chromosomal regions is available for use on
both the Ion Personal Genome Machine (PGM) and MiSeq platforms to screen for
causative mutations in these genes. METHODS: We used this Haloplex ICCG panel for
targeted sequencing of 15 patients with clinical presentations indicative of an
abnormality in one of the 180 genes. Sequencing runs were done using the Ion 318
Chips on the Ion Torrent PGM. Variants were filtered for known polymorphisms and
analysis was done to identify possible disease-causing variants before validation
by Sanger sequencing. When possible, segregation of variants with phenotype in
family members was performed to ascertain the pathogenicity of the variant.
RESULTS: More than 97% of the target bases were covered at >20×. There was an
average of 9.6 novel variants per patient. Pathogenic mutations were identified
in five genes for six patients, with two novel variants. There were another five
likely pathogenic variants, some of which were unreported novel variants.
CONCLUSIONS: In a cohort of 15 patients, we were able to identify a likely
genetic etiology in six patients (40%). Another five patients had candidate
variants for which further evaluation and segregation analysis are ongoing. Our
results indicate that the HaloPlex ICCG panel is useful as a rapid,
high-throughput and cost-effective screening tool for 170 of the 180 genes. There
is low coverage for some regions in several genes which might have to be
supplemented by Sanger sequencing. However, comparing the cost, ease of analysis,
and shorter turnaround time, it is a good alternative to exome sequencing for
patients whose features are suggestive of a genetic etiology involving one of the
genes in the panel.