Journal Article

PURA syndrome: clinical delineation and genotype-phenotype study in 32 individuals with review of published literature

Baralle, Diana, Lönnqvist, Tuula, Niessing, Dierk, Nellaker, Christoffer, Keros, Sotirios, Cooper, Nicola S, Clayton-Smith, Jill, Schieving, Jolanda, Douzgou, Sofia, Waugh, Jeff L, van Essen, Ton J, Leventer, Richard J, Smeets, Eric, Sterbova, Katalin, Brunner, Han G, Ruhoy, Ilene, Janowski, Robert, Tan, Ene-Choo, Chandler, Kate E, Smithson, Sarah F, Lassuthova, Petra, Anderson, Mel, Clowes, Virginia E, Hunt, David, Reijnders, Margot R F, Rouhl, Rob P W, Lev, Dorit L, Isohanni, Pirjo, Foo, Roger, Siu, Victoria Mok, Stegmann, Alexander P A, Cobben, Jan Maarten, Bok, Levinus A, Rankin, Julia, Lai, Angeline H M, Alvi, Mohsan, Williams, Shelley, Neupauerová, Jana, Whiteford, Margo, Green, Andrew, Stevens, Servi J C, Mansour, Sahar, DDD study, The, Pfundt, Rolph, Self, Jay E, Dowling, James J, Engelen, Marc, Carvalho, Karen S, Selber, Paulo, van Dijk, Katinke, van Hoeckel, Ceciel, Stumpel, Connie T R M, Vreeburg, Maaike

2018

Overview

BackgroundDe novo mutations in PURA have recently been described to cause PURA syndrome, a neurodevelopmental disorder characterised by severe intellectual disability (ID), epilepsy, feeding difficulties and neonatal hypotonia.ObjectivesTo delineate the clinical spectrum of PURA syndrome and study genotype-phenotype correlations.MethodsDiagnostic or research-based exome or Sanger sequencing was performed in individuals with ID. We systematically collected clinical and mutation data on newly ascertained PURA syndrome individuals, evaluated data of previously reported individuals and performed a computational analysis of photographs. We classified mutations based on predicted effect using 3D in silico models of crystal structures of Drosophila-derived Pur-alpha homologues. Finally, we explored genotype-phenotype correlations by analysis of both recurrent mutations as well as mutation classes.ResultsWe report mutations in PURA (purine-rich element binding protein A) in 32 individuals, the largest cohort described so far. Evaluation of clinical data, including 22 previously published cases, revealed that all have moderate to severe ID and neonatal-onset symptoms, including hypotonia (96%), respiratory problems (57%), feeding difficulties (77%), exaggerated startle response (44%), hypersomnolence (66%) and hypothermia (35%). Epilepsy (54%) and gastrointestinal (69%), ophthalmological (51%) and endocrine problems (42%) were observed frequently. Computational analysis of facial photographs showed subtle facial dysmorphism. No strong genotype-phenotype correlation was identified by subgrouping mutations into functional classes.ConclusionWe delineate the clinical spectrum of PURA syndrome with the identification of 32 additional individuals. The identification of one individual through targeted Sanger sequencing points towards the clinical recognisability of the syndrome. Genotype-phenotype analysis showed no significant correlation between mutation classes and disease severity.

• Publisher: BMJ Publishing Group Ltd,BMJ Publishing Group LTD,BMJ Publishing Group
• Subject: Computational neuroscience / Convulsions & seizures / DNA-Binding Proteins - chemistry / DNA-Binding Proteins - genetics / Drosophila Proteins - chemistry / Drosophila Proteins - genetics / Epilepsy / epilepsy and seizures / Eye Abnormalities - genetics / Face - abnormalities / Feeding / Female / Genetic Association Studies / Genotype & phenotype / Genotypes / Humans / Hypothermia / hypotonia / Infant, Newborn / intellectual disability / Intellectual Disability - genetics / Muscle Hypotonia - etiology / Muscle Hypotonia - genetics / Mutation / neonatal problems / Neonates / Neurodevelopmental disorders / Phenotypes / Pregnancy / Proteins / PURA syndrome / Questionnaires / Startle response / Structural Homology, Protein / Syndrome / Transcription Factors - chemistry / Transcription Factors - genetics