TY - JOUR
T1 - Further clinical and molecular delineation of the 15q24 microdeletion syndrome
AU - Mefford, Heather C.
AU - Rosenfeld, Jill A.
AU - Shur, Natasha
AU - Slavotinek, Anne M.
AU - Cox, Victoria A.
AU - Hennekam, Raoul C.
AU - Firth, Helen V.
AU - Willatt, Lionel
AU - Wheeler, Patricia
AU - Morrow, Eric M.
AU - Cook, Joseph
AU - Sullivan, Rachel
AU - Oh, Albert
AU - McDonald, Marie T.
AU - Zonana, Jonathan
AU - Keller, Kory
AU - Hannibal, Mark C.
AU - Ball, Susie
AU - Kussmann, Jennifer
AU - Gorski, Jerome
AU - Zelewski, Susan
AU - Banks, Valerie
AU - Smith, Wendy
AU - Smith, Rosemarie
AU - Paull, Lindsay
AU - Rosenbaum, Kenneth N.
AU - Amor, David J.
AU - Silva, Joao
AU - Lamb, Allen
AU - Eichler, Evan E.
PY - 2012
Y1 - 2012
N2 - Background Chromosome 15q24 microdeletion syndrome is a rare genomic disorder characterised by intellectual disability, growth retardation, unusual facial morphology and other anomalies. To date, 20 patients have been reported; 18 have had detailed breakpoint analysis. Aim To further delineate the features of the 15q24 microdeletion syndrome, the clinical and molecular characterisation of fifteen patients with deletions in the 15q24 region was performed, nearly doubling the number of reported patients. Methods Breakpoints were characterised using a custom, high-density array comparative hybridisation platform, and detailed phenotype information was collected for each patient. Results Nine distinct deletions with different breakpoints ranging in size from 266 kb to 3.75 Mb were identified. The majority of breakpoints lie within segmental duplication (SD) blocks. Low sequence identity and large intervals of unique sequence between SD blocks likely contribute to the rarity of 15q24 deletions, which occur 8-10 times less frequently than 1q21 or 15q13 microdeletions in our series. Two small, atypical deletions were identified within the region that help delineate the critical region for the core phenotype in the 15q24 microdeletion syndrome. Conclusion The molecular characterisation of these patients suggests that the core cognitive features of the 15q24 microdeletion syndrome, including developmental delays and severe speech problems, are largely due to deletion of genes in a 1.1-Mb critical region. However, genes just distal to the critical region also play an important role in cognition and in the development of characteristic facial features associated with 15q24 deletions. Clearly, deletions in the 15q24 region are variable in size and extent. Knowledge of the breakpoints and size of deletion combined with the natural history and medical problems of our patients provide insights that will inform management guidelines. Based on common phenotypic features, all patients with 15q24 microdeletions should receive a thorough neurodevelopmental evaluation, physical, occupational and speech therapies, and regular audiologic and ophthalmologic screening
AB - Background Chromosome 15q24 microdeletion syndrome is a rare genomic disorder characterised by intellectual disability, growth retardation, unusual facial morphology and other anomalies. To date, 20 patients have been reported; 18 have had detailed breakpoint analysis. Aim To further delineate the features of the 15q24 microdeletion syndrome, the clinical and molecular characterisation of fifteen patients with deletions in the 15q24 region was performed, nearly doubling the number of reported patients. Methods Breakpoints were characterised using a custom, high-density array comparative hybridisation platform, and detailed phenotype information was collected for each patient. Results Nine distinct deletions with different breakpoints ranging in size from 266 kb to 3.75 Mb were identified. The majority of breakpoints lie within segmental duplication (SD) blocks. Low sequence identity and large intervals of unique sequence between SD blocks likely contribute to the rarity of 15q24 deletions, which occur 8-10 times less frequently than 1q21 or 15q13 microdeletions in our series. Two small, atypical deletions were identified within the region that help delineate the critical region for the core phenotype in the 15q24 microdeletion syndrome. Conclusion The molecular characterisation of these patients suggests that the core cognitive features of the 15q24 microdeletion syndrome, including developmental delays and severe speech problems, are largely due to deletion of genes in a 1.1-Mb critical region. However, genes just distal to the critical region also play an important role in cognition and in the development of characteristic facial features associated with 15q24 deletions. Clearly, deletions in the 15q24 region are variable in size and extent. Knowledge of the breakpoints and size of deletion combined with the natural history and medical problems of our patients provide insights that will inform management guidelines. Based on common phenotypic features, all patients with 15q24 microdeletions should receive a thorough neurodevelopmental evaluation, physical, occupational and speech therapies, and regular audiologic and ophthalmologic screening
U2 - https://doi.org/10.1136/jmedgenet-2011-100499
DO - https://doi.org/10.1136/jmedgenet-2011-100499
M3 - Article
C2 - 22180641
SN - 0022-2593
VL - 49
SP - 110
EP - 118
JO - Journal of medical genetics
JF - Journal of medical genetics
IS - 2
ER -