title: Evidence for a recurrent microdeletion at chromosome 16p11.2 associated with congenital anomalies of the kidney and urinary tract (CAKUT) and Hirschsprung disease.
abstract: Congenital Anomalies of the Kidney and Urinary Tract can be associated with Hirschsprung disease. We report on three children with a similar 16p11.2 microdeletion with a spectrum of clinical anomalies consisting of congenital anomalies of the kidney and urinary tract in two patients (Patients 1 and 2) and Hirschsprung disease in two patients (Patients 1 and 3), leading us to hypothesize that a gene in this region is associated with these phenotypes. Patient 1 presented with left renal agenesis, grade-IV vesicoureteral reflux, and Hirschsprung disease, Patient 2 with left renal agenesis, chronic kidney disease, chronic constipation, seizures, and developmental delay, and Patient 3 with Hirschsprung disease and normal kidneys. Genome-wide microarray analysis demonstrated overlapping microdeletions within 16p11.2. The shortest region of overlap in the three patients contained only eight genes, including the SH2 domain-containing binding protein 1 (SH2B1), an adaptor protein which has been implicated in enhancement of the tyrosine kinase activity of RET, whose role in developmental disease of the kidney and enteric enervation is well established. Our findings suggest that 16p11.2 deletions are associated with abnormalities of renal and enteric development and we hypothesize that deletion of SH2B1 may account for the observed phenotype.
authors.affiliation: Division of Pediatric Nephrology, The Children's Hospital of Philadelphia, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania 19104, USA. sampsonm@email.chop.edu
authors.forename: Matthew G
authors.initials: MG
authors.lastname: Sampson
authors.forename: Curtis R
authors.initials: CR
authors.lastname: Coughlin
authors.forename: Paige
authors.initials: P
authors.lastname: Kaplan
authors.forename: Laura K
authors.initials: LK
authors.lastname: Conlin
authors.forename: Kevin E C
authors.initials: KE
authors.lastname: Meyers
authors.forename: Elaine H
authors.initials: EH
authors.lastname: Zackai
authors.forename: Nancy B
authors.initials: NB
authors.lastname: Spinner
authors.forename: Lawrence
authors.initials: L
authors.lastname: Copelovitch
mesh_terms: D000293:Adolescent; D002648:Child; D002885:Chromosomes, Human, Pair 16 / Q000235:genetics*; D004423:Ear / Q000002:abnormalities; D055106:Genome-Wide Association Study; D006627:Hirschsprung Disease / Q000235:genetics*; D006801:Humans; D007231:Infant, Newborn; D007668:Kidney / Q000002:abnormalities*; D008297:Male; D020411:Oligonucleotide Array Sequence Analysis; D010641:Phenotype; D020641:Polymorphism, Single Nucleotide; D017384:Sequence Deletion; D014551:Urinary Tract / Q000002:abnormalities*