Targeted Next-Generation Sequencing for Clinical Diagnosis of 561 Mendelian Diseases.
BACKGROUND
Targeted next-generation sequencing (NGS) is a cost-effective approach for rapid and accurate detection of genetic mutations in patients with suspected genetic disorders, which can facilitate effective diagnosis.


RESULTS
We designed a capture array to mainly capture all the coding sequence (CDS) of 2,181 genes associated with 561 Mendelian diseases and conducted NGS to detect mutations. The accuracy of NGS was 99.95%, which was obtained by comparing the genotypes of selected loci between our method and SNP Array in four samples from normal human adults. We also tested the stability of the method using a sample from normal human adults. The results showed that an average of 97.79% and 96.72% of single-nucleotide variants (SNVs) in the sample could be detected stably in a batch and different batches respectively. In addition, the method could detect various types of mutations. Some disease-causing mutations were detected in 69 clinical cases, including 62 SNVs, 14 insertions and deletions (Indels), 1 copy number variant (CNV), 1 microdeletion and 2 microduplications of chromosomes, of which 35 mutations were novel. Mutations were confirmed by Sanger sequencing or real-time polymerase chain reaction (PCR).


CONCLUSIONS
Results of the evaluation showed that targeted NGS enabled to detect disease-causing mutations with high accuracy, stability, speed and throughput. Thus, the technology can be used for the clinical diagnosis of 561 Mendelian diseases.
Department of Genetics, Jiangxi Provincial Women and Children Hospital, Nanchang, 330006, China.
Yanqiu
Y
Liu
BGI-Wuhan, Wuhan, 430075, China; BGI-Shenzhen, Shenzhen, 518083, China.
Xiaoming
X
Wei
Prenatal Diagnosis Center, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, 450052, China.
Xiangdong
X
Kong
BGI-Wuhan, Wuhan, 430075, China; BGI-Shenzhen, Shenzhen, 518083, China.
Xueqin
X
Guo
BGI-Wuhan, Wuhan, 430075, China; BGI-Shenzhen, Shenzhen, 518083, China.
Yan
Y
Sun
BGI-Wuhan, Wuhan, 430075, China; BGI-Shenzhen, Shenzhen, 518083, China.
Jianfen
J
Man
BGI-Wuhan, Wuhan, 430075, China; BGI-Shenzhen, Shenzhen, 518083, China.
Lique
L
Du
BGI-Wuhan, Wuhan, 430075, China; BGI-Shenzhen, Shenzhen, 518083, China.
Hui
H
Zhu
BGI-Shenzhen, Shenzhen, 518083, China.
Zelan
Z
Qu
Department of Obstetrics and Gynecology, Wuhan Medical and Health Center for Women and Children, Wuhan, 430022, China.
Ping
P
Tian
Department of Neurology, Wuhan Medical and Health Center for Women and Children, Wuhan, 430022, China.
Bing
B
Mao
BGI-Wuhan, Wuhan, 430075, China; BGI-Shenzhen, Shenzhen, 518083, China.
Yun
Y
Yang
D000293:Adolescent; D000328:Adult; D000368:Aged; D002648:Child; D002675:Child, Preschool; D056915:DNA Copy Number Variations / Q000235:genetics; D005260:Female; D030342:Genetic Diseases, Inborn / Q000175:diagnosis* / Q000235:genetics; D059014:High-Throughput Nucleotide Sequencing; D006801:Humans; D008297:Male; D008875:Middle Aged; D009154:Mutation; D060888:Real-Time Polymerase Chain Reaction; D017422:Sequence Analysis, DNA / Q000379:methods*; D055815:Young Adult