title: Delineation of a region responsible for panhypopituitarism in 20p11.2.
abstract: We report on the case of a young woman with a de novo 20p11.21p11.23 deletion, discovered by array-CGH. She has behavioral troubles with autistic traits, intellectual disability, panhypopituitarism, severe hypoglycemia, epilepsy, and scoliosis. The majority of the reported 20p deletions are located on the 20p12 region, covering the JAG1 gene responsible for the Alagille syndrome. More proximal deletions are even rarer, with very few cases described in the literature to date. The deletion carried by our patient is, to our knowledge, the smallest described de novo proximal 20p11.2 deletion. It was first discovered by 0.5 Mb BAC array-CGH, further delineated using an oligonucleotide array, and finally confirmed by fluorescence in situ hybridization. The deletion is 4.22 Mb in size, with the exact location on chr20: 19.810.034-24.031.344 (Feb. 2009, GRCh37/hg19). In light of the other reported cases that display genomic and phenotypic overlap with our patient, we discuss the phenotype of our patient, in order to further delineate the 20p proximal deletion phenotype. We propose a minimal critical region responsible for panhypopituitarism with global developmental delay, intellectual disability, scoliosis and facial dysmorphism. Moreover, considering the deleted genes, we highlight the impact of the deletion of this minimal critical region on the Shh signaling pathway.
authors: Service de Génétique Médicale, Hôpital de l'Archet II, CHU Nice, Nice Cedex 3, France. quere.m@chu-nice.fr
authors: Manal
authors: M
authors: Dayem-Quere
authors: Fabienne
authors: F
authors: Giuliano
authors: Kathy
authors: K
authors: Wagner-Mahler
authors: Christophe
authors: C
authors: Massol
authors: Letizia
authors: L
authors: Crouzet-Ozenda
authors: Jean-Claude
authors: JC
authors: Lambert
authors: Houda
authors: H
authors: Karmous-Benailly
mesh_terms: D000293:Adolescent; D002872:Chromosome Deletion; D002890:Chromosomes, Human, Pair 20; D002658:Developmental Disabilities / Q000235:genetics; D004827:Epilepsy / Q000235:genetics; D005260:Female; D006801:Humans; D007003:Hypoglycemia / Q000235:genetics; D007018:Hypopituitarism / Q000235:genetics*; D017404:In Situ Hybridization, Fluorescence; D008607:Intellectual Disability / Q000235:genetics; D020411:Oligonucleotide Array Sequence Analysis; D012600:Scoliosis / Q000235:genetics