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Are 22q11.2 distal deletions associated with math difficulties?
Author(s) -
Carvalho Maria Raquel Santos,
Vianna Gabrielle,
Oliveira Lívia de Fátima Silva,
Costa Annelise Julio,
PinheiroChagas Pedro,
Sturzenecker Rosane,
Zen Paulo Ricardo Gazzola,
Rosa Rafael Fabiano Machado,
de Aguiar Marcos José Burle,
Haase Vitor Geraldi
Publication year - 2014
Publication title -
american journal of medical genetics part a
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.064
H-Index - 112
eISSN - 1552-4833
pISSN - 1552-4825
DOI - 10.1002/ajmg.a.36649
Subject(s) - intellectual disability , multiplex ligation dependent probe amplification , psychology , intelligence quotient , population , neuropsychology , genetic syndromes , cognition , developmental psychology , pediatrics , audiology , medicine , genetics , psychiatry , biology , environmental health , gene , exon
Approximately 6% of school‐aged children have math difficulties (MD). A neurogenetic etiology has been suggested due to the presence of MD in some genetic syndromes such as 22q11.2DS. However, the contribution of 22q11.2DS to the MD phenotype has not yet been investigated. This is the first population‐based study measuring the frequency of 22q11.2DS among school children with MD. Children (1,564) were identified in the schools through a screening test for language and math. Of these children, 152 (82 with MD and 70 controls) were selected for intelligence, general neuropsychological, and math cognitive assessments and for 22q11.2 microdeletion screening using MLPA. One child in the MD group had a 22q11.2 deletion spanning the LCR22‐4 to LCR22‐5 interval. This child was an 11‐year‐old girl with subtle anomalies, normal intelligence, MD attributable to number sense deficit, and difficulties in social interactions. Only 19 patients have been reported with this deletion. Upon reviewing these reports, we were able to characterize a new syndrome, 22q11.2 DS (LCR22‐4 to LCR22‐5), characterized by prematurity; pre‐ and postnatal growth restriction; apparent hypotelorism, short/upslanting palpebral fissures; hypoplastic nasal alae; pointed chin and nose; posteriorly rotated ears; congenital heart defects; skeletal abnormalities; developmental delay, particularly compromising the speech; learning disability (including MD, in one child); intellectual disability; and behavioral problems. These results suggest that 22q11.2 DS (LCR22‐4 to LCR22‐5) may be one of the genetic causes of MD. © 2014 Wiley Periodicals, Inc.