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Identification of a novel deletion mutation in DPY19L2 from an infertile patient with globozoospermia: a case report

Authors
  • Li, You-zhu1
  • Wu, Rong-feng1
  • Zhu, Xing-shen2
  • Liu, Wen-sheng2
  • Ye, Yuan-yuan1
  • Lu, Zhong-xian2
  • Li, Na3
  • 1 The First Affiliated Hospital of Xiamen University, No. 6 Guchengxi Road, Si Ming, Xiamen, 361003, China , Xiamen (China)
  • 2 Xiamen University, Xiamen, Fujian, 361005, China , Xiamen (China)
  • 3 Fujian Medical University Xiamen Humanity Hospital, No.3777 Xianyue Road, Huli, Xiamen, 361009, China , Xiamen (China)
Type
Published Article
Journal
Molecular Cytogenetics
Publisher
Springer (Biomed Central Ltd.)
Publication Date
Jun 22, 2020
Volume
13
Issue
1
Identifiers
DOI: 10.1186/s13039-020-00495-1
Source
Springer Nature
Keywords
License
Green

Abstract

BackgroundMale infertility is an increasing medical concern worldwide. In most cases, genetic factors are considered as the main cause of the disease. Globozoospermia (MIM102530) (also known as round-headed sperm) is a rare and severe malformed spermatospermia caused by acrosome deficiency or severe malformation. A subset of genetic mutations, such as DNAH6, SPATA16, DPY19L2, PICK1, and CCIN related to globozoospermia, have been reported in the past few years. The DPY19L2 mutation is commonly found in patients with globozoospermia. Herein, a 180-kbp homozygote deletion at 12q14.2 (g.63950001–64130000) was identified by copy number variation sequencing (CNVseq) in a patient with a globozoospermia, including the complete deletion of DPY19L2.Case presentationA 27-year-old patient at the First Affiliated Hospital of Xiamen University was diagnosed with infertility because, despite normal sexual activity for 4 years, his wife did not conceive. The patient was in good health with no obvious discomfort, no history of adverse chemical exposure, and no vices, such as smoking and drinking. The physical examination revealed normal genital development. However, semen tests showed a normal sperm count of 0% and the morphology was the round head. Sperm cytology showed that acrosomal enzyme was lower than normal. Reproductive hormones were in the normal range. B ultrasound did not show any abnormal seminal vesicle, prostate, bilateral testis, epididymis, and spermatic veins. The karyotype was normal, 46, XY, and no microdeletion of Y chromosome was detected. However, a homozygous deletion mutation was found in DPY19L2, which was further diagnosed as globozoospermia.ConclusionsThe present study reported a male infertility patient who was diagnosed with globozoospermia. The analysis of gene mutations revealed that DPY19L2 had a homozygous mutation, which was the primary cause of globozoospermia.

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