A novel GNAS mutation in pseudohypoparathyroidism type 1a in a Chinese man presented with recurrent seizure: a case report

BMC Endocr Disord. 2021 Jan 9;21(1):12. doi: 10.1186/s12902-020-00651-z.

Abstract

Background: Pseudohypoparathyroidism is a rare genetic disease characterized by hypocalcaemia and hyperphosphataemia due to the defect to the guanine nucleotide-binding protein alpha subunit (GNAS) gene. Patients with pseudoparathyroidism type 1a and 1c could manifest Albright's hereditary osteodystrophy and multiple hormone resistance including gonadotropin and thyroid stimulating hormone.

Case presentation: Here we report a Chinese man who presented with fatigue, recurrent seizure and Albright's hereditary osteodystrophy. His genetic study revealed a heterozygote mutation in the GNAS gene [NM_000516.4(GNAS): c2787_2788del (p.Val930AspfsTer12)]. After calcium and calcitriol supplement, his seizures achieved partially remission.

Conclusions: We report a case of PHP1a or 1c with a novel frameshift mutation in GNAS gene in a patient presenting with AHO, as well as TSH and partial gonadotropin resistance. This mutation in this case has not been reported in literature and adds to the spectrum of genetic mutations related to PHP.

Keywords: Case report; GNAS gene; Novel mutation; Pseudohypoparathyroidism.

Publication types

  • Case Reports

MeSH terms

  • Adult
  • Asian People
  • Calcitriol / therapeutic use
  • Calcium / therapeutic use
  • Chromogranins / genetics*
  • Dietary Supplements
  • Fibrous Dysplasia, Polyostotic / complications
  • Frameshift Mutation / genetics*
  • GTP-Binding Protein alpha Subunits, Gs / genetics*
  • Hormones / blood
  • Humans
  • Male
  • Mutation
  • Pseudohypoparathyroidism / complications
  • Pseudohypoparathyroidism / diagnostic imaging
  • Pseudohypoparathyroidism / genetics*
  • Recurrence
  • Seizures / etiology
  • Seizures / genetics*
  • Thyrotropin / blood

Substances

  • Chromogranins
  • Hormones
  • Thyrotropin
  • GNAS protein, human
  • GTP-Binding Protein alpha Subunits, Gs
  • Calcitriol
  • Calcium