Are 22q11.2 distal deletions associated with math difficulties?

[22q11.2 deletion syndrome]

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 22 q 11 .2 DS . However , the contribution of 22 q 11 .2 DS to the MD phenotype has not yet been investigated . This is the first population-based study measuring the frequency of 22 q 11 .2 DS 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 22 q 11 .2 microdeletion screening using MLPA . One child in the MD group had a 22 q 11 .2 deletion spanning the LCR 22 -4 to LCR 22 -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 , 22 q 11 .2 DS (LCR 22 -4 to LCR 22 -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 22 q 11 .2 DS (LCR 22 -4 to LCR 22 -5 ) may be one of the genetic causes of MD .

Diseases
Validation

Diseases presenting "intellectual disability" symptom

22q11.2 deletion syndrome

alexander disease

alpha-thalassemia

aniridia

child syndrome

cohen syndrome

cowden syndrome

hirschsprung disease

homocystinuria without methylmalonic aciduria

hydrocephalus with stenosis of the aqueduct of sylvius

kabuki syndrome

kallmann syndrome

monosomy 21

oculocutaneous albinism

oligodontia

phenylketonuria

proteus syndrome

triple a syndrome

wolf-hirschhorn syndrome

This symptom has already been validated