Germline mutation in POLR2A: a heterogeneous, multi-systemic developmental disorder characterized by transcriptional dysregulation

Adam W. Hansen, Payal Arora, Michael M. Khayat, Leah J. Smith, Andrea M. Lewis, Linda Z. Rossetti, Joy Jayaseelan, Ingrid Cristian, Devon Haynes, Stephanie DiTroia, Naomi Meeks, Mauricio R. Delgado, Jill A. Rosenfeld, Lynn Pais, Susan M. White, Qingchang Meng, Davut Pehlivan, Pengfei Liu, Marie Claude Gingras, Michael F. WanglerDonna M. Muzny, James R. Lupski, Craig D. Kaplan, Richard A. Gibbs

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

De novo germline variation in POLR2A was recently reported to associate with a neurodevelopmental disorder. We report twelve individuals harboring putatively pathogenic de novo or inherited variants in POLR2A, detail their phenotypes, and map all known variants to the domain structure of POLR2A and crystal structure of RNA polymerase II. Affected individuals were ascertained from a local data lake, pediatric genetics clinic, and an online community of families of affected individuals. These include six affected by de novo missense variants (including one previously reported individual), four clinical laboratory samples affected by missense variation with unknown inheritance—with yeast functional assays further supporting altered function—one affected by a de novo in-frame deletion, and one affected by a C-terminal frameshift variant inherited from a largely asymptomatic mother. Recurrently observed phenotypes include ataxia, joint hypermobility, short stature, skin abnormalities, congenital cardiac abnormalities, immune system abnormalities, hip dysplasia, and short Achilles tendons. We report a significantly higher occurrence of epilepsy (8/12, 66.7%) than previously reported (3/15, 20%) (p value = 0.014196; chi-square test) and a lower occurrence of hypotonia (8/12, 66.7%) than previously reported (14/15, 93.3%) (p value = 0.076309). POLR2A-related developmental disorders likely represent a spectrum of related, multi-systemic developmental disorders, driven by distinct mechanisms, converging at a single locus.

Original languageEnglish (US)
Article number100014
JournalHuman Genetics and Genomics Advances
Volume2
Issue number1
DOIs
StatePublished - Jan 14 2021

Keywords

  • Mendelian disease
  • POLR2A
  • Pol II
  • RNA polymerase II
  • RNAPII
  • RPB1
  • developmental disorder
  • genocentric
  • phenotypic expansion
  • transcriptopathy

ASJC Scopus subject areas

  • Molecular Medicine
  • Genetics(clinical)

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