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Targeted Sequencing and Immunological Analysis Reveal the Involvement of Primary Immunodeficiency Genes in Pediatric IBD: a Japanese Multicenter Study

Authors
  • Suzuki, Tasuku1
  • Sasahara, Yoji1
  • Kikuchi, Atsuo1
  • Kakuta, Humihiko2
  • Kashiwabara, Toshihiko3
  • Ishige, Takashi4
  • Nakayama, Yoshiko5
  • Tanaka, Masanori6
  • Hoshino, Akihiro7, 8
  • Kanegane, Hirokazu8
  • Abukawa, Daiki2
  • Kure, Shigeo1
  • 1 Tohoku University Graduate School of Medicine, Department of Pediatrics, 1-1 Seiryo-machi, Aoba-ku, Sendai, Miyagi, 980-8574, Japan , Sendai (Japan)
  • 2 Miyagi Children’s Hospital, Department of General Pediatrics, Sendai, Miyagi, Japan , Sendai (Japan)
  • 3 Yamagata Prefectural Central Hospital, Department of Gastroenterology, Yamagata, Japan , Yamagata (Japan)
  • 4 Gunma University Graduate School of Medicine, Department of Pediatrics, Gunma, Japan , Gunma (Japan)
  • 5 Shinshu University School of Medicine, Department of Pediatrics, Nagano, Japan , Nagano (Japan)
  • 6 Hirosaki City Hospital, Department of Pathology and Laboratory Medicine, Aomori, Japan , Aomori (Japan)
  • 7 Toyama University School of Medicine, Department of Pediatrics, Toyama, Japan , Toyama (Japan)
  • 8 Tokyo Medical and Dental University, Department of Pediatrics, Faculty of Medicine, Tokyo, Japan , Tokyo (Japan)
Type
Published Article
Journal
Journal of Clinical Immunology
Publisher
Springer-Verlag
Publication Date
Oct 17, 2016
Volume
37
Issue
1
Pages
67–79
Identifiers
DOI: 10.1007/s10875-016-0339-5
Source
Springer Nature
Keywords
License
Yellow

Abstract

PurposePediatric inflammatory bowel disease (IBD) is a heterogeneous disorder caused by multiple factors. Although genetic and immunological analyses are required for a definitive diagnosis, no reports of a comprehensive genetic study of a Japanese population are available.MethodsIn total, 35 Japanese patients <16 years of age suffering from IBD, including 27 patients aged <6 years with very early-onset IBD, were enrolled in this multicenter study. Exome and targeted gene panel sequencing was performed for all patients. Mutations in genes responsible for primary immunodeficiency diseases (PID) and clinical and immunological parameters were evaluated according to disease type.ResultsWe identified monogenic mutations in 5 of the 35 patients (14.3 %). We identified compound heterozygous and homozygous splice-site mutations in interleukin-10 receptor A (IL-10RA) in two patients, nonsense mutations in X-linked inhibitor of apoptosis protein (XIAP) in two patients, and a missense mutation in cytochrome b beta chain in one patient. Using assays for protein expression levels, IL-10 signaling, and cytokine production, we confirmed that the mutations resulted in loss of function. For each patient, genotype was significantly associated with clinical findings. We successfully treated a patient with a XIAP mutation by allogeneic cord blood hematopoietic stem cell transplantation, and his symptoms were ameliorated completely.ConclusionsTargeted sequencing and immunological analysis are useful for screening monogenic disorders and selecting curative therapies in pediatric patients with IBD. The genes responsible for PID are frequently involved in pediatric IBD and play critical roles in normal immune homeostasis in the gastrointestinal tract.

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