Novel CNS malformations and skeletal anomalies in a patient with Beaulieu-boycott-Innes syndrome
| Autor: | Mohamad Maghnie, Andrea Accogli, Mariasavina Severino, Annalisa Calcagno, Maria Margherita Mancardi, Raffaele Castello, Annalaura Torella, Vincenzo Nigro, Anna Allegri, Marcello Scala, Francesco Musacchia, Valeria Capra |
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| Přispěvatelé: | Accogli, Andrea, Scala, Marcello, Calcagno, Annalisa, Castello, Raffaele, Torella, Annalaura, Musacchia, Francesco, Allegri, Anna M. E., Mancardi, Maria M., Maghnie, Mohamad, Severino, Mariasavina, Nigro, Vincenzo, Capra, Valeria |
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
0301 basic medicine
Pathology medicine.medical_specialty gynecological anomalie Adolescent Transcription export complex Nervous System Malformations Compound heterozygosity gynecological anomalies mesencephalosynapsis Short stature 03 medical and health sciences Dysgenesis Hypergonadotropic hypogonadism Stem cell fate specification Beaulieu–boycott–Innes syndrome Genetic Central Nervous System Diseases Genetics Humans Medicine skeletal malformations THOC6 transcription/export complex Alleles Genetic Association Studies Genetics (clinical) business.industry Facies RNA-Binding Proteins Syndrome medicine.disease Magnetic Resonance Imaging Musculoskeletal Abnormalities Pedigree skeletal malformation Phenotype 030104 developmental biology mesencephalosynapsi Aqueductal stenosis Mutation Female medicine.symptom business Mild microcephaly |
| Popis: | THO/TREX (transcription/export) is a conserved eukaryotic complex that plays a crucial role in gene expression and prevents DNA damage during mitosis and meiosis. In mammals, TREX is essential during embryogenesis, determining stem cell fate specification by regulating posttranscriptional self-renewal and differentiation in several tissues. It is composed of a core called THO, consisting of THOC1, 2, 5, 6, 7, and additional proteins. Bi-allelic mutations in THOC6 have been associated to Beaulieu–Boycott–Innes syndrome (BBIS), a syndromic form of intellectual disability (ID). To date, nine patients harbouring homozygous or compound heterozygous mutations in THOC6 have been reported. Despite the clinical heterogenity and subtle dysmorphic features in some individuals, distinctive facial features are tall forehead, short and upslanting palpebral fissures, deep set eyes, flat philtrum, and malocclusion. Nonlife threatening congenital anomalies are common, including cardiac and renal malformations, anteriorly displaced anus, cryptorchidism in males, submucous cleft palate, and corpus callosum dysgenesis. Affected patients usually have short stature, mild microcephaly, and mild to moderate ID. Here, we describe an Italian patient with BBIS, carrying two compound heterozygous loss-of-function (LoF) variants in THOC6 (c.577C > T, p.R193* and c.792_793delCA, p.V264Vfs*48). In addition to the common phenotype, she displays cerebellar hypoplasia with severe vermian dysgenesis and hydrocephalus due to aqueductal stenosis, multiple skeletal anomalies and hypergonadotropic hypogonadism. Thus, we review the previous cases and discuss the phenotypic spectrum of BBIS, providing further evidence regarding the pivotal role of TREX complex in human development. |
| Databáze: | OpenAIRE |
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