A novel syndrome with short stature, mandibular hypoplasia, and osteoporosis may be associated with a PRRT3 variant

Abhimanyu Garg, Hatem El-Shanti, Chao Xing, Zhengyang Zhou, Mousa Abujbara, Khadeja Al-Rashed, Mohammed El-Khateeb, Kamel Ajlouni, Anil K. Agarwal

Research output: Contribution to journalArticle

Abstract

Context: Despite considerable progress in elucidating the molecular basis of various progeroid syndromes, some rare patients remain unexplained. Objective: To elucidate molecular genetic basis of a novel autosomal recessive progeroid syndrome. Participants: A 24-year-old male and his 18-year-old sister with short stature, mandibular hypoplasia, pointed nose, shrill voice, severe osteoporosis, and short eyebrows and their unaffected siblings and parents belonging to a consanguineous Arab family. Results: Using exome and Sanger sequencing, we report a novel homozygous p.Glu394Lys disease-causing variant in proline-rich transmembrane protein 3 (PRRT3). PRRT3 belongs to the family of proline-rich proteins containing several repeats of a short proline-rich sequence, but its function remains to be determined. Preliminary observations showing colocalization of Prrt3 and synaptophysin support its role in vesicle exocytosis. Consistent with the highest messenger ribonucleic acid expression of PRRT3 in the pituitary, both the patients had mild growth hormone deficiency but had near normal reproductive development. Conclusions: We conclude that the homozygous p.Glu394Lys variant in PRRT3 may be associated with a novel autosomal recessive, progeroid syndrome with short stature, mandibular hypoplasia, osteoporosis, short eyebrows, and mild growth hormone (GH) deficiency. Our findings extend the spectrum of progeroid syndromes and elucidate important functions of PRRT3 in human biology, including secretion of GH from the pituitary.

Original languageEnglish
Article numberbvaa088
JournalJournal of the Endocrine Society
Volume4
Issue number8
DOIs
StatePublished - 1 Aug 2020

Keywords

  • Growth
  • Mandibular hypoplasia
  • Progeroid syndrome
  • PRRT3
  • Short stature

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    Garg, A., El-Shanti, H., Xing, C., Zhou, Z., Abujbara, M., Al-Rashed, K., El-Khateeb, M., Ajlouni, K., & Agarwal, A. K. (2020). A novel syndrome with short stature, mandibular hypoplasia, and osteoporosis may be associated with a PRRT3 variant. Journal of the Endocrine Society, 4(8), [bvaa088]. https://doi.org/10.1210/jendso/bvaa088