Whole-exome analysis of 177 pediatric patients with undiagnosed diseases

Kotaro Narita, Hideki Muramatsu, Satoshi Narumi, Yuji Nakamura, Yusuke Okuno, Kyogo Suzuki, Motoharu Hamada, Naoya Yamaguchi, Atsushi Suzuki, Yosuke Nishio, Anna Shiraki, Ayako Yamamori, Yusuke Tsumura, Fumi Sawamura, Masahiro Kawaguchi, Manabu Wakamatsu, Shinsuke Kataoka, Kohji Kato, Hideyuki Asada, Tetsuo KubotaYukako Muramatsu, Hiroyuki Kidokoro, Jun Natsume, Seiji Mizuno, Tomohiko Nakata, Hidehito Inagaki, Naoko Ishihara, Takahiro Yonekawa, Akihisa Okumura, Tomoo Ogi, Seiji Kojima, Tadashi Kaname, Tomonobu Hasegawa, Shinji Saitoh, Yoshiyuki Takahashi

Research output: Contribution to journalArticlepeer-review

Abstract

Recently, whole-exome sequencing (WES) has been used for genetic diagnoses of patients who remain otherwise undiagnosed. WES was performed in 177 Japanese patients with undiagnosed conditions who were referred to the Tokai regional branch of the Initiative on Rare and Undiagnosed Diseases (IRUD) (TOKAI-IRUD). This study included only patients who had not previously received genome-wide testing. Review meetings with specialists in various medical fields were held to evaluate the genetic diagnosis in each case, which was based on the guidelines of the American College of Medical Genetics and Genomics. WES identified diagnostic single-nucleotide variants in 66 patients and copy number variants (CNVs) in 11 patients. Additionally, a patient was diagnosed with Angelman syndrome with a complex clinical phenotype upon detection of a paternally derived uniparental disomy (UPD) [upd(15)pat] wherein the patient carried a homozygous DUOX2 p.E520D variant in the UPD region. Functional analysis confirmed that this DUOX2 variant was a loss-of-function missense substitution and the primary cause of congenital hypothyroidism. A significantly higher proportion of genetic diagnoses was achieved compared to previous reports (44%, 78/177 vs. 24–35%, respectively), probably due to detailed discussions and the higher rate of CNV detection.

Original languageEnglish
Article number14589
JournalScientific reports
Volume12
Issue number1
DOIs
Publication statusPublished - 2022 Dec

ASJC Scopus subject areas

  • General

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