Disruption of the responsible gene in a phosphoglucomutase 1 deficiency patient by homozygous chromosomal inversion

Katsuyuki Yokoi, Yoko Nakajima, Tamae Ohye, Hidehito Inagaki, Yoshinao Wada, Tokiko Fukuda, Hideo Sugie, Isao Yuasa, Tetsuya Ito, Hiroki Kurahashi

Research output: Chapter in Book/Report/Conference proceedingChapter

8 Citations (Scopus)


Phosphoglucomutase 1 (PGM1) deficiency is a recently defined disease characterized by glycogenosis and a congenital glycosylation disorder caused by recessive mutations in the PGM1gene. We report a case of a 12-year-old boy with first-cousin parents who was diagnosed with a PGM1 deficiency due to significantly decreased PGM1 activity in his muscle. However, Sanger sequencing revealed no pathogenic mutation in the PGM1 gene in this patient. As this case presented with a cleft palate in addition to hypoglycemia and elevated transaminases and creatine kinase, karyotyping was performed and identified homozygous inv(1)(p31.1p32.3). Based on the chromosomal location of the PGM1 gene at 1p31, we analyzed the breakpoint of the inversion. Fluorescence in situ hybridization (FISH) combined with long PCR analysis revealed that the inversion disrupts the PGM1 gene within intron 1. Since the initiation codon in thePGM1 gene is located within exon 1, we speculated that this inversion inactivates the PGM1 gene and was therefore responsible for the patient’s phenotype. When standard molecular testing fails to reveal a mutation despite a positive clinical and biochemical diagnosis, the presence of a gross structural variant that requires karyotypic examination must be considered.

Original languageEnglish
Title of host publicationJIMD Reports
Number of pages6
Publication statusPublished - 2019

Publication series

NameJIMD Reports
ISSN (Print)2192-8304
ISSN (Electronic)2192-8312

All Science Journal Classification (ASJC) codes

  • Internal Medicine
  • Endocrinology, Diabetes and Metabolism
  • Biochemistry, Genetics and Molecular Biology (miscellaneous)


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