title: Evidence for a new contiguous gene syndrome, the chromosome 16p13.3 deletion syndrome alias severe Rubinstein-Taybi syndrome.
abstract: Rubinstein-Taybi syndrome (RSTS) is a well-known autosomal dominant mental retardation syndrome with typical facial and skeletal abnormalities. Previously, we have reported two patients presenting with RSTS and additional clinical features including failure to thrive, seizures, and intractable infections (Bartsch et al. in Eur J Hum Genet 7:748-756, 1999). Recently we identified a third patient with this condition, termed here severe RSTS, or chromosome 16p13.3 deletion syndrome. The three patients died in infancy, and all displayed a specific mutation, a chromosomal microdeletion including the 3'-end of the CREBBP gene. Using fluorescence in situ hybridization and closely spaced DNA probes, we characterized the deletion intervals in these patients and in three individuals with a deletion of CREBBP and typical RSTS. The deleted DNA segments were found to greatly vary in size, spanning from approximately 40 kb to >3 Mb. Four individuals, including the patients with severe RSTS, exhibited deletions containing gene/s in addition to CREBBP. The patients with severe RSTS all had deletions comprising telomeric neighbor genes of CREBBP, including DNASE1, a dominant gene encoding a nuclease that has been associated with systemic lupus erythematodes. Our findings suggest that severe RSTS is distinct from RSTS and represents a novel true contiguous gene syndrome (chromosome 16p13.3 deletion syndrome). Because of the risk of critical infections and high mortality rate, we recommend that the size of the deletion interval should be determined in CREBBP deletion-positive patients with RSTS, especially in young children. Further studies are needed to delineate the clinical spectrum of the new disorder and to clarify the role of DNASE1.
authors.affiliation: Institute for Human Genetics, Mainz University School of Medicine, 55101, Mainz, Germany. bartsch@humgen.klinik.uni-mainz.de
authors.forename: Oliver
authors.initials: O
authors.lastname: Bartsch
authors.forename: Sasan
authors.initials: S
authors.lastname: Rasi
authors.forename: Alicia
authors.initials: A
authors.lastname: Delicado
authors.forename: Sarah
authors.initials: S
authors.lastname: Dyack
authors.forename: Luitgard M
authors.initials: LM
authors.lastname: Neumann
authors.forename: Eva
authors.initials: E
authors.lastname: Seemanová
authors.forename: Marianne
authors.initials: M
authors.lastname: Volleth
authors.forename: Thomas
authors.initials: T
authors.lastname: Haaf
authors.forename: Vera M
authors.initials: VM
authors.lastname: Kalscheuer
mesh_terms: D050882:CREB-Binding Protein / Q000235:genetics*; D002872:Chromosome Deletion; D002885:Chromosomes, Human, Pair 16; D003850:Deoxyribonuclease I / Q000235:genetics*; D005260:Female; D017353:Gene Deletion; D006801:Humans; D017404:In Situ Hybridization, Fluorescence; D007223:Infant; D008297:Male; D012415:Rubinstein-Taybi Syndrome / Q000235:genetics* / Q000473:pathology
chemical_list: D050882:CREB-Binding Protein; C494363:CREBBP protein, human; C085693:DNASE1 protein, human; D003850:Deoxyribonuclease I