Frontiers in Pediatrics (Dec 2023)

Case Report: Novel biallelic moderately damaging variants in RTTN in a patient with cerebellar dysplasia

  • Ferruccio Romano,
  • Elisabetta Amadori,
  • Elisabetta Amadori,
  • Francesca Madia,
  • Mariasavina Severino,
  • Valeria Capra,
  • Renata Rizzo,
  • Rita Barone,
  • Beatrice Corradi,
  • Beatrice Corradi,
  • Luca Maragliano,
  • Luca Maragliano,
  • Mohammad Sadegh Shams Nosrati,
  • Antonio Falace,
  • Pasquale Striano,
  • Pasquale Striano,
  • Federico Zara,
  • Federico Zara,
  • Marcello Scala,
  • Marcello Scala

DOI
https://doi.org/10.3389/fped.2023.1326552
Journal volume & issue
Vol. 11

Abstract

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Rotatin, encoded by the RTTN gene, is a centrosomal protein with multiple, emerging functions, including left-right specification, ciliogenesis, and neuronal migration. Recessive variants in RTTN are associated with a neurodevelopmental disorder with microcephaly and malformations of cortical development known as “Microcephaly, short stature, and polymicrogyria with seizures” (MSSP, MIM #614833). Affected individuals show a wide spectrum of clinical manifestations like intellectual disability, poor/absent speech, short stature, microcephaly, and congenital malformations. Here, we report a subject showing a distinctive neuroradiological phenotype and harboring novel biallelic variants in RTTN: the c.5500A>G, p.(Asn1834Asp), (dbSNP: rs200169343, ClinVar ID:1438510) and c.19A>G, p.(Ile7Val), (dbSNP: rs201165599, ClinVar ID:1905275) variants. In particular brain magnetic resonance imaging (MRI) showed a peculiar pattern, with cerebellar hypo-dysplasia, and multiple arachnoid cysts in the lateral cerebello-medullary cisterns, in addition to left Meckel cave. Thus, we compare his phenotypic features with current literature, speculating a possible role of newly identified RTTN variants in his clinical picture, and supporting a relevant variability in this emerging condition.

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