Recurrent deletions and reciprocal duplications of 10q11.21q11.23 including CHAT and SLC18A3 are likely mediated by complex low-copy repeats.

Stankiewicz P, Kulkarni S, Dharmadhikari AV, Sampath S, Bhatt SS, Shaikh TH, Xia Z, Pursley AN, Cooper ML, Shinawi M, Paciorkowski AR, Grange DK, Noetzel MJ, Saunders S, Simons P, Summar M, Lee B, Scaglia F, Fellmann F, Martinet D, Beckmann JS, Asamoah A, Platky K, Sparks S, Martin AS, Madan-Khetarpal S, Hoover J, Medne L, Bonnemann CG, Moeschler JB, Vallee SE, Parikh S, Irwin P, Dalzell VP, Smith WE, Banks VC, Flannery DB, Lovell CM, Bellus GA, Golden-Grant K, Gorski JL, Kussmann JL, McGregor TL, Hamid R, Pfotenhauer J, Ballif BC, Shaw CA, Kang SH, Bacino CA, Patel A, Rosenfeld JA, Cheung SW, Shaffer LG
Hum Mutat. 2012 33 (1): 165-79

PMID: 21948486 · PMCID: PMC3655525 · DOI:10.1002/humu.21614

We report 24 unrelated individuals with deletions and 17 additional cases with duplications at 10q11.21q21.1 identified by chromosomal microarray analysis. The rearrangements range in size from 0.3 to 12 Mb. Nineteen of the deletions and eight duplications are flanked by large, directly oriented segmental duplications of >98% sequence identity, suggesting that nonallelic homologous recombination (NAHR) caused these genomic rearrangements. Nine individuals with deletions and five with duplications have additional copy number changes. Detailed clinical evaluation of 20 patients with deletions revealed variable clinical features, with developmental delay (DD) and/or intellectual disability (ID) as the only features common to a majority of individuals. We suggest that some of the other features present in more than one patient with deletion, including hypotonia, sleep apnea, chronic constipation, gastroesophageal and vesicoureteral refluxes, epilepsy, ataxia, dysphagia, nystagmus, and ptosis may result from deletion of the CHAT gene, encoding choline acetyltransferase, and the SLC18A3 gene, mapping in the first intron of CHAT and encoding vesicular acetylcholine transporter. The phenotypic diversity and presence of the deletion in apparently normal carrier parents suggest that subjects carrying 10q11.21q11.23 deletions may exhibit variable phenotypic expressivity and incomplete penetrance influenced by additional genetic and nongenetic modifiers.

© 2011 Wiley Periodicals, Inc.

MeSH Terms (22)

Abnormalities, Multiple Child Child, Preschool Chromosome Aberrations Chromosome Mapping Chromosomes, Human, Pair 10 Developmental Disabilities DNA Copy Number Variations Female Genetic Variation Homologous Recombination Humans Infant In Situ Hybridization, Fluorescence Intellectual Disability Male Nerve Growth Factors Oligonucleotide Array Sequence Analysis Penetrance Segmental Duplications, Genomic Sequence Deletion Vesicular Acetylcholine Transport Proteins

Connections (1)

This publication is referenced by other Labnodes entities:

Links