American journal of medical genetics. Part A, 2017-12, Vol.173 (12), p.3136-3142
Frontonasal dysplasias are rare congenital malformations of frontonasal process‐derived structures, characterized by median cleft, nasal anomalies, widely spaced eyes, and cranium bifidum occultum. Several entities of syndromic frontonasal dysplasia have been described, among which, to date, only a few have identified molecular bases. We clinically ascertained a cohort of 124 individuals referred for frontonasal dysplasia. We identified six individuals with a similar phenotype, including one discordant monozygous twin. Facial features were remarkable by nasal deformity with creased ridge and depressed or absent tip, widely spaced eyes, almond‐shaped palpebral fissures, and downturned corners of the mouth. All had apparently normal psychomotor development. In addition, upper limb anomalies, frontonasal encephalocele, corpus callosum agenesis, choanal atresia, and congenital heart defect were observed. We identified five reports in the literature of patients presenting with the same phenotype. Exome sequencing was performed on DNA extracted from blood of two individuals, no candidate gene was identified. In conclusion, we report six novel simplex individuals presenting with a specific frontonasal dysplasia entity associating recognizable facial features, limb and visceral malformations, and apparently normal development. The identification of discordant monozygotic twins supports the hypothesis of a mosaic disorder. Although previous patients have been reported, this is the first series, allowing delineation of a clinical subtype of frontonasal dysplasia, paving the way toward the identification of its molecular etiology.
Abnormalities, Multiple - genetics ; Agenesis of Corpus Callosum - diagnosis ; Agenesis of Corpus Callosum - genetics ; Birth defects ; Choanal atresia ; Choanal Atresia - diagnosis ; Choanal Atresia - genetics ; Cohort Studies ; Congenital defects ; Corpus callosum ; Craniofacial Abnormalities - classification ; Craniofacial Abnormalities - diagnosis ; Craniofacial Abnormalities - genetics ; Deoxyribonucleic acid ; DNA ; DNA sequencing ; Dysplasia ; Encephalocele ; Encephalocele - diagnosis ; Encephalocele - genetics ; Encephalocele - pathology ; Etiology ; Face - abnormalities ; Facial Bones - abnormalities ; Female ; frontonasal dysplasia ; Genetics ; Heart Defects, Congenital - diagnosis ; Heart Defects, Congenital - genetics ; Human genetics ; Humans ; Infant ; Life Sciences ; Male ; nasal malformation ; nasofrontal encephalocele ; Nose - abnormalities ; Phenotype ; Twins ; Whole Exome Sequencing
Hellenic Academic Libraries Link
Wiley Online Library All Journals
https://www.ncbi.nlm.nih.gov/pubmed/29136349$$D View this record in MEDLINE/PubMed
Permalink to record
https://hal-univ-bourgogne.archives-ouvertes.fr/hal-01661829$$DView record in HAL