Rare UNC13B variations and risk of schizophrenia: Whole-exome sequencing in a multiplex family and follow-up resequencing and a case–control study

Jun Egawa, Satoshi Hoya, Yuichiro Watanabe, Ayako Nunokawa, Masako Shibuya, Masashi Ikeda, Emiko Inoue, Shujiro Okuda, Kenji Kondo, Takeo Saito, Naoshi Kaneko, Tatsuyuki Muratake, Hirofumi Igeta, Nakao Iwata, Toshiyuki Someya

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Rare genomic variations inherited in multiplex schizophrenia families are suggested to play a role in the genetic etiology of the disease. To identify rare variations with large effects on the risk of developing schizophrenia, we performed whole-exome sequencing (WES) in two affected and one unaffected individual of a multiplex family with 10 affected individuals. We also performed follow-up resequencing of the unc-13 homolog B (Caenorhabditis elegans) (UNC13B) gene, a potential risk gene identified by WES, in the multiplex family and undertook a case–control study to investigate association between UNC13B and schizophrenia. UNC13B coding regions (39 exons) from 15 individuals of the multiplex family and 111 affected offspring for whom parental DNA samples were available were resequenced. Rare missense UNC13B variations identified by resequencing were further tested for association with schizophrenia in two independent case–control populations comprising a total of 1,753 patients and 1,602 controls. A rare missense variation (V1525M) in UNC13B was identified by WES in the multiplex family; this variation was present in five of six affected individuals, but not in eight unaffected individuals or one individual of unknown disease status. Resequencing UNC13B coding regions identified five rare missense variations (T103M, M813T, P1349T, I1362T, and V1525M). In the case–control study, there was no significant association between rare missense UNC13B variations and schizophrenia, although single-variant meta-analysis indicated that M813T was nominally associated with schizophrenia. These results do not support a contribution of rare missense UNC13B variations to the genetic etiology of schizophrenia in the Japanese population.

Original languageEnglish
Pages (from-to)797-805
Number of pages9
JournalAmerican Journal of Medical Genetics, Part B: Neuropsychiatric Genetics
Volume171
Issue number6
DOIs
Publication statusPublished - 01-09-2016

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Exome
Schizophrenia
Inborn Genetic Diseases
Caenorhabditis elegans
Population
Genes
Meta-Analysis
Exons
DNA

All Science Journal Classification (ASJC) codes

  • Genetics(clinical)
  • Psychiatry and Mental health
  • Cellular and Molecular Neuroscience

Cite this

Egawa, Jun ; Hoya, Satoshi ; Watanabe, Yuichiro ; Nunokawa, Ayako ; Shibuya, Masako ; Ikeda, Masashi ; Inoue, Emiko ; Okuda, Shujiro ; Kondo, Kenji ; Saito, Takeo ; Kaneko, Naoshi ; Muratake, Tatsuyuki ; Igeta, Hirofumi ; Iwata, Nakao ; Someya, Toshiyuki. / Rare UNC13B variations and risk of schizophrenia : Whole-exome sequencing in a multiplex family and follow-up resequencing and a case–control study. In: American Journal of Medical Genetics, Part B: Neuropsychiatric Genetics. 2016 ; Vol. 171, No. 6. pp. 797-805.
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Rare UNC13B variations and risk of schizophrenia : Whole-exome sequencing in a multiplex family and follow-up resequencing and a case–control study. / Egawa, Jun; Hoya, Satoshi; Watanabe, Yuichiro; Nunokawa, Ayako; Shibuya, Masako; Ikeda, Masashi; Inoue, Emiko; Okuda, Shujiro; Kondo, Kenji; Saito, Takeo; Kaneko, Naoshi; Muratake, Tatsuyuki; Igeta, Hirofumi; Iwata, Nakao; Someya, Toshiyuki.

In: American Journal of Medical Genetics, Part B: Neuropsychiatric Genetics, Vol. 171, No. 6, 01.09.2016, p. 797-805.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Rare UNC13B variations and risk of schizophrenia

T2 - Whole-exome sequencing in a multiplex family and follow-up resequencing and a case–control study

AU - Egawa, Jun

AU - Hoya, Satoshi

AU - Watanabe, Yuichiro

AU - Nunokawa, Ayako

AU - Shibuya, Masako

AU - Ikeda, Masashi

AU - Inoue, Emiko

AU - Okuda, Shujiro

AU - Kondo, Kenji

AU - Saito, Takeo

AU - Kaneko, Naoshi

AU - Muratake, Tatsuyuki

AU - Igeta, Hirofumi

AU - Iwata, Nakao

AU - Someya, Toshiyuki

PY - 2016/9/1

Y1 - 2016/9/1

N2 - Rare genomic variations inherited in multiplex schizophrenia families are suggested to play a role in the genetic etiology of the disease. To identify rare variations with large effects on the risk of developing schizophrenia, we performed whole-exome sequencing (WES) in two affected and one unaffected individual of a multiplex family with 10 affected individuals. We also performed follow-up resequencing of the unc-13 homolog B (Caenorhabditis elegans) (UNC13B) gene, a potential risk gene identified by WES, in the multiplex family and undertook a case–control study to investigate association between UNC13B and schizophrenia. UNC13B coding regions (39 exons) from 15 individuals of the multiplex family and 111 affected offspring for whom parental DNA samples were available were resequenced. Rare missense UNC13B variations identified by resequencing were further tested for association with schizophrenia in two independent case–control populations comprising a total of 1,753 patients and 1,602 controls. A rare missense variation (V1525M) in UNC13B was identified by WES in the multiplex family; this variation was present in five of six affected individuals, but not in eight unaffected individuals or one individual of unknown disease status. Resequencing UNC13B coding regions identified five rare missense variations (T103M, M813T, P1349T, I1362T, and V1525M). In the case–control study, there was no significant association between rare missense UNC13B variations and schizophrenia, although single-variant meta-analysis indicated that M813T was nominally associated with schizophrenia. These results do not support a contribution of rare missense UNC13B variations to the genetic etiology of schizophrenia in the Japanese population.

AB - Rare genomic variations inherited in multiplex schizophrenia families are suggested to play a role in the genetic etiology of the disease. To identify rare variations with large effects on the risk of developing schizophrenia, we performed whole-exome sequencing (WES) in two affected and one unaffected individual of a multiplex family with 10 affected individuals. We also performed follow-up resequencing of the unc-13 homolog B (Caenorhabditis elegans) (UNC13B) gene, a potential risk gene identified by WES, in the multiplex family and undertook a case–control study to investigate association between UNC13B and schizophrenia. UNC13B coding regions (39 exons) from 15 individuals of the multiplex family and 111 affected offspring for whom parental DNA samples were available were resequenced. Rare missense UNC13B variations identified by resequencing were further tested for association with schizophrenia in two independent case–control populations comprising a total of 1,753 patients and 1,602 controls. A rare missense variation (V1525M) in UNC13B was identified by WES in the multiplex family; this variation was present in five of six affected individuals, but not in eight unaffected individuals or one individual of unknown disease status. Resequencing UNC13B coding regions identified five rare missense variations (T103M, M813T, P1349T, I1362T, and V1525M). In the case–control study, there was no significant association between rare missense UNC13B variations and schizophrenia, although single-variant meta-analysis indicated that M813T was nominally associated with schizophrenia. These results do not support a contribution of rare missense UNC13B variations to the genetic etiology of schizophrenia in the Japanese population.

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