Brain calcifications and <i>PCDH12</i> variants - CEA - Commissariat à l’énergie atomique et aux énergies alternatives Access content directly
Journal Articles Neurology Genetics Year : 2024

Brain calcifications and PCDH12 variants

Monica Sanchez-Contreras
  • Function : Author
Maria J Sobrido
  • Function : Author
Adi Aran
  • Function : Author

Abstract

Objective: To assess the potential connection between PCDH12 and brain calcifications in a patient carrying a homozygous nonsense variant in PCDH12 and in adult patients with brain calcifications. Methods: We performed a CT scan in 1 child with a homozygous PCDH12 nonsense variant. We screened DNA samples from 53 patients with primary familial brain calcification (PFBC) and 26 patients with brain calcification of unknown cause (BCUC). Results: We identified brain calcifications in subcortical and perithalamic regions in the patient with a homozygous PCDH12 nonsense variant. The calcification pattern was different from what has been observed in PFBC and more similar to what is described in in utero infections. In patients with PFBC or BCUC, we found no protein-truncating variant and 3 rare (minor allele frequency <0.001) PCDH12 predicted damaging missense heterozygous variants in 3 unrelated patients, albeit with no segregation data available. Conclusions: Brain calcifications should be added to the phenotypic spectrum associated with PCDH12 biallelic loss of function, in the context of severe cerebral developmental abnormalities. A putative role for PCDH12 variants remains to be determined in PFBC.
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Dates and versions

cea-04513458 , version 1 (20-03-2024)

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Gaël Nicolas, Monica Sanchez-Contreras, Eliana Marisa Ramos, Roberta R Lemos, Joana Ferreira, et al.. Brain calcifications and PCDH12 variants. Neurology Genetics, 2024, 3 (4), ⟨10.1212/nxg.0000000000000166⟩. ⟨cea-04513458⟩
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