Evidence for a new contiguous gene syndrome, the chromosome 16p13.3 deletion syndrome alias severe Rubinstein-Taybi syndrome

• Published in: Human genetics Vol. 120; no. 2; pp. 179 - 186
• Main Authors: BARTSCH, Oliver, RASI, Sasan, DELICADO, Alicia, DYACK, Sarah, NEUMANN, Luitgard M, SEEMANOVA, Eva, VOLLETH, Marianne, HAAF, Thomas, KALSCHEUER, Vera M
• Format: Journal Article
• Language: English
• Published: Heidelberg Springer 01.09.2006; Berlin Springer Nature B.V; New York, NY
• Subjects: Biological and medical sciences; Chromosome Deletion; Chromosomes; Chromosomes, Human, Pair 16; Classical genetics, quantitative genetics, hybrids; Complex syndromes; CREB-Binding Protein - genetics; Deoxyribonuclease I - genetics; Failure to thrive; Female; Fundamental and applied biological sciences. Psychology; Gene Deletion; Genetics of eukaryotes. Biological and molecular evolution; Human; Humans; In Situ Hybridization, Fluorescence; Infant; Infections; Intellectual disabilities; Lupus; Male; Medical genetics; Medical sciences; Mutation; Rubinstein-Taybi Syndrome - genetics; Rubinstein-Taybi Syndrome - pathology; Chromosomal aberration; Gene; Deletion; Chromosome; Genetics; Severe; Syndrome
• ISSN: 0340-6717; 1432-1203
• DOI: 10.1007/s00439-006-0215-0

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.