Elucidation of the phenotypic spectrum and genetic landscape in primary and secondary microcephaly

Marcella Zollino, Paranchai Boonsawat, Pascal Joset, Katharina Steindl, Beatrice Oneda, Laura Gogoll, Silvia Azzarello-Burri, Frenny Sheth, Chaitanya Datar, Ishwar C. Verma, Ratna Dua Puri, Ruxandra Bachmann-Gagescu, Dunja Niedrist, Michael Papik, Joana Figueiro-Silva, Rahim Masood, Markus Zweier, Dennis Kraemer, Sharyn Lincoln, Lance RodanSandrine Passemard, Séverine Drunat, Alain Verloes, Anselm H. C. Horn, Heinrich Sticht, Robert Steinfeld, Barbara Plecko, Beatrice Latal, Oskar Jenni, Reza Asadollahi, Anita Rauch

Risultato della ricerca: Contributo in rivistaArticolo in rivista

12 Citazioni (Scopus)

Abstract

Purpose: Microcephaly is a sign of many genetic conditions but has been rarely systematically evaluated. We therefore comprehensively studied the clinical and genetic landscape of an unselected cohort of patients with microcephaly. Methods: We performed clinical assessment, high-resolution chromosomal microarray analysis, exome sequencing, and functional studies in 62 patients (58% with primary microcephaly [PM], 27% with secondary microcephaly [SM], and 15% of unknown onset). Results: We found severity of developmental delay/intellectual disability correlating with severity of microcephaly in PM, but not SM. We detected causative variants in 48.4% of patients and found divergent inheritance and variant pattern for PM (mainly recessive and likely gene-disrupting [LGD]) versus SM (all dominant de novo and evenly LGD or missense). While centrosome-related pathways were solely identified in PM, transcriptional regulation was the most frequently affected pathway in both SM and PM. Unexpectedly, we found causative variants in different mitochondria-related genes accounting for ~5% of patients, which emphasizes their role even in syndromic PM. Additionally, we delineated novel candidate genes involved in centrosome-related pathway (SPAG5, TEDC1), Wnt signaling (VPS26A, ZNRF3), and RNA trafficking (DDX1). Conclusion: Our findings enable improved evaluation and genetic counseling of PM and SM patients and further elucidate microcephaly pathways.
Lingua originaleEnglish
pagine (da-a)2043-2058
RivistaGenetics in Medicine
Volume21
DOI
Stato di pubblicazionePubblicato - 2019

Keywords

  • Genetics (clinical)
  • MCPH
  • genetic counseling
  • mitochondria
  • primary microcephaly
  • secondary microcephaly

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