Molecular cytogenetic characterization of an interstitial de novo 13q deletion in a 3-month-old with severe pediatric gastroesophageal reflux

Genetics of enteric neuropathies

Abnormal development or disturbed functioning of the enteric nervous system (ENS), the intrinsic innervation of the gastrointestinal tract, is associated with the development of neuropathic gastrointestinal motility disorders. Here, we review the underlying molecular basis of these disorders and hypothesize that many of them have a common defective biological mechanism. Genetic burden and environmental components affecting this common mechanism are ultimately responsible for disease severity and symptom heterogeneity. We believe that they act together as the fulcrum in a seesaw balanced with harmful and protective factors, and are responsible for a continuum of symptoms ranging from neuronal hyperplasia to absence of neurons.

13q13.1-q13.2 deletion in tetralogy of Fallot: clinical report and a literature review

Recent advances in microarray technology are helping to identify more genetic anomalies associated with tetralogy of Fallot and other congenital heart defects. We report on a 24-year-old woman with a syndromic form of tetralogy of Fallot who was found to have a novel de novo deletion of the proximal long arm of chromosome 13. History of developmental delay and learning difficulties, mild dysmorphic facial features, and anal atresia prompted genetic investigations. A review of the literature on deletions that overlap this region showed that several were associated with major congenital heart defects. The results suggest that the 13q13.1-q13.2 region may harbour a gene or genes important in cardiac development.