Chromosome 15q24 microdeletion syndrome is a rare microdeletion syndrome characterized by growth retardation, intellectual disability, and distinct facial features including long face with high anterior hairline, hypertelorism, epicanthal folds, downslanting palpebral fissures, sparse and broad medial eyebrows, broad and/or depressed nasal bridge, small mouth, long smooth philtrum, and full lower lip. Other common findings include skeletal and digital abnormalities, genital abnormalities in males, hypotonia, behavior problems, recurrent infections, and eye problems. The recurrent deletions of chromosome 15q24 result from non-allelic homologous recombination (NAHR) mediated by low-copy repeat (LCR, also called segmental duplication) clusters. The deletion occurred as a de novo event in all known cases. Recent study has identified that haploinsufficiency of SIN3A (chromosome 15q24.2) is associated with mild syndromic intellectual disability. This phenotype is highly related to that of individuals with atypical 15q24 microdeletions, linking SIN3A to this microdeletion syndrome.
Category
Chromosomal abnormality
Brite
Human diseases in ICD-11 classification [BR:br08403]
20 Developmental anomalies
Chromosomal anomalies, excluding gene mutations
LD44 Deletions of the autosomes
H01861 Chromosome 15q24 microdeletion syndrome
McInnes LA, Nakamine A, Pilorge M, Brandt T, Jimenez Gonzalez P, Fallas M, Manghi ER, Edelmann L, Glessner J, Hakonarson H, Betancur C, Buxbaum JD
Title
A large-scale survey of the novel 15q24 microdeletion syndrome in autism spectrum disorders identifies an atypical deletion that narrows the critical region.
Witteveen JS, Willemsen MH, Dombroski TC, van Bakel NH, Nillesen WM, van Hulten JA, Jansen EJ, Verkaik D, Veenstra-Knol HE, van Ravenswaaij-Arts CM, Wassink-Ruiter JS, Vincent M, David A, Le Caignec C, Schieving J, Gilissen C, Foulds N, Rump P, Strom T, Cremer K, Zink AM, Engels H, de Munnik SA, Visser JE, Brunner HG, Martens GJ, Pfundt R, Kleefstra T, Kolk SM
Title
Haploinsufficiency of MeCP2-interacting transcriptional co-repressor SIN3A causes mild intellectual disability by affecting the development of cortical integrity.
