Germline and Mosaic Variants in PRKACA and PRKACB Cause a Multiple Congenital Malformation Syndrome

Adrian Palencia-Campos, Phillip C. Aoto, Erik M.F. Machal, Ana Rivera-Barahona, Patricia Soto-Bielicka, Daniela Bertinetti, Blaine Baker, Lily Vu, Francesca Piceci-Sparascio, Isabella Torrente, Eveline Boudin, Silke Peeters, Wim Van Hul, Celine Huber, Dominique Bonneau, Michael S. Hildebrand, Matthew Coleman, Melanie Bahlo, Mark F. Bennett, Amy L. SchneiderIngrid E. Scheffer, Maria Kibæk, Britta S. Kristiansen, Mahmoud Y. Issa, Mennat I. Mehrez, Samira Ismail, Jair Tenorio, Gaoyang Li, Bjørn Steen Skålhegg, Ghada A. Otaify, Samia Temtamy, Mona Aglan, Aia E. Jønch, Alessandro De Luca, Geert Mortier, Valérie Cormier-Daire, Alban Ziegler, Mathew Wallis, Pablo Lapunzina, Friedrich W. Herberg, Susan S. Taylor, Victor L. Ruiz-Perez

Research output: Contribution to journalArticlepeer-review

Abstract

PRKACA and PRKACB code for two catalytic subunits (Cα and Cβ) of cAMP-dependent protein kinase (PKA), a pleiotropic holoenzyme that regulates numerous fundamental biological processes such as metabolism, development, memory, and immune response. We report seven unrelated individuals presenting with a multiple congenital malformation syndrome in whom we identified heterozygous germline or mosaic missense variants in PRKACA or PRKACB. Three affected individuals were found with the same PRKACA variant, and the other four had different PRKACB mutations. In most cases, the mutations arose de novo, and two individuals had offspring with the same condition. Nearly all affected individuals and their affected offspring shared an atrioventricular septal defect or a common atrium along with postaxial polydactyly. Additional features included skeletal abnormalities and ectodermal defects of variable severity in five individuals, cognitive deficit in two individuals, and various unusual tumors in one individual. We investigated the structural and functional consequences of the variants identified in PRKACA and PRKACB through the use of several computational and experimental approaches, and we found that they lead to PKA holoenzymes which are more sensitive to activation by cAMP than are the wild-type proteins. Furthermore, expression of PRKACA or PRKACB variants detected in the affected individuals inhibited hedgehog signaling in NIH 3T3 fibroblasts, thereby providing an underlying mechanism for the developmental defects observed in these cases. Our findings highlight the importance of both Cα and Cβ subunits of PKA during human development.

Original languageEnglish
Pages (from-to)977-988
Number of pages12
JournalAmerican Journal of Human Genetics
Volume107
Issue number5
DOIs
Publication statusPublished - Nov 5 2020

Keywords

  • cAMP signaling
  • congenital heart defects
  • Ellis-van Creveld syndrome
  • GLI transcritpion factors
  • hedgehog signaling
  • mosaicism
  • PKA
  • postaxial polydactyly
  • PRKACA
  • PRKACB

ASJC Scopus subject areas

  • Genetics
  • Genetics(clinical)

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