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Hereditas(Beijing) ›› 2022, Vol. 44 ›› Issue (11): 1063-1071.doi: 10.16288/j.yczz.22-223

• Genetic Resource • Previous Articles     Next Articles

Diagnosis and genetic analysis of a case with glycogen storage disease type V caused by compound heterozygous mutations in the PYGM gene

Wanzi Jiang(), Yiwen Xu, Yiwen Wang, Xiaocheng Zhu, Yingyun Gong, Hongwen Zhou, Zhenzhen Fu()   

  1. Department of Endocrinology, the First Affiliated Hospital of Nanjing Medical University, Nanjing 210029, China
  • Received:2022-06-30 Revised:2022-09-07 Online:2022-11-20 Published:2022-09-16
  • Contact: Fu Zhenzhen E-mail:1995jwz@sina.com;zhenzhen1127@foxmail.com
  • Supported by:
    the National Key Research and Development Program of China(2019YFA0802701);the National Key Research and Development Program of China(2018YFA0506904);the National Natural Science Foundation of China(82170882);the Major Research Plan of the National Natural Science Foundation of China(91854122)

Abstract:

Glycogen storage disease type V is an autosomal recessive genetic disorder caused by muscle glycogen phosphorylase (PYGM) deficiency, which is characterized by exercise intolerance, second wind phenomena and high level of serum creatine kinase. In this study, we reported a Chinese young man with glycogen storage disease type V, with lower extremity weakness after exercise, increased creatine kinase, and slight fat infiltration in the posterior group of thigh muscle by magnetic resonance imaging (MRI). The proband had complex heterozygous PYGM disease-causing mutations, including c.308T>C (p.L103P) variant transmitted from the mother and c.260_261delCT (p.S87Ffs*23) from the father, of which the former was a novel PYGM mutation. This study enriched the PYGM pathogenic gene mutation spectrum, contributed to improve clinicians' understanding of glycogen storage disease type V and provided a reference for further genetic study of the disease.

Key words: glycogen storage disease type V, McArdle disease, PYGM, rare disease