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Hereditary spherocytosis caused by copy number variation in SPTB gene identified through targeted next-generation sequencing

  • Woori Jang
  • Jiyeon Kim
  • Hyojin Chae
  • Myungshin KimEmail author
  • Kyung-Nam KohEmail author
  • Chan-Jeoung Park
  • Yonggoo Kim
Case Report
  • 101 Downloads

Abstract

Hereditary spherocytosis (HS) is a heterogeneous genetic disorder characterized by spherocytosis on peripheral blood smear with hemolytic anemia, accompanied by signs of hemolysis. Herein, we report a 5-month-old Korean girl with HS resulting from a de novo 271 Kb microdeletion of 14q23.3. She presented with hemolytic anemia and mild splenomegaly. Spherocytosis was seen on examination of peripheral blood. Eosin-5′-maleimide (EMA) test and flow cytometric osmotic fragility test were positive. She had no relevant family history of spherocytosis. No pathogenic single nucleotide variants or small insertions/deletions were detected in HS-associated genes. Array comparative genomic hybridization analysis revealed a 271 Kb deletion at chromosome 14q23.3, encompassing the SPTB, CHURC1, GPX2, RAB15, FNTB, and MAX genes. We found a deletion affecting 5′ UTR, exon 1, and part of intron 1 of the SPTB gene using targeted next-generation sequencing (NGS) analysis, suggesting that NGS may be able to identify disease-causing copy number variations (CNVs), as well as small point mutations in HS patients. In addition, chromosomal microarray may be useful in defining combined deleted genes. Additional evaluations should thus be considered in the diagnosis of HS, especially when CNV is revealed as disease-causing abnormality.

Keywords

Hereditary spherocytosis SPTB Deletion Next-generation sequencing Chromosomal microarray 

Notes

Acknowledgements

We are grateful to the patient and her parents. We thank The Catholic Genetic Laboratory Center for assisting us in carrying out this study and compiling this report. This research was supported by the Bio & Medical Technology Development Program of the National Research Foundation (NRF) funded by the Ministry of Science & ICT (2018M3A9E8020866) and Research Fund of Seoul St. Mary’s Hospital, The Catholic University of Korea.

Compliance with ethical standards

Conflict of interest

All authors declare that there is no conflict of interest.

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Copyright information

© Japanese Society of Hematology 2019

Authors and Affiliations

  1. 1.Department of Laboratory Medicine, College of Medicine, Seoul St. Mary’s HospitalThe Catholic University of KoreaSeoulRepublic of Korea
  2. 2.Catholic Genetic Laboratory Center, College of MedicineThe Catholic University of KoreaSeoulRepublic of Korea
  3. 3.Department of Pediatrics, Asan Medical Center Children’s HospitalUniversity of Ulsan College of MedicineSeoulRepublic of Korea
  4. 4.Department of Laboratory Medicine, Asan Medical CenterUniversity of Ulsan College of MedicineSeoulRepublic of Korea

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