Journal
AMERICAN JOURNAL OF HUMAN GENETICS
Volume 85, Issue 2, Pages 264-272Publisher
CELL PRESS
DOI: 10.1016/j.ajhg.2009.07.004
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Funding
- Wellcome Trust
- British Telecom
- Isaac Newton Trust
- National Health Service (NHS) Anglia & Oxford Regional R&D Strategic Investment Award
- NHS Eastern Region R&D Training Fellowship Award
- Grampian Healthcare Trust
- Grampian Primary Care NHS Trust
- Wellcome Trust Principal Research Fellow
- Royal Society Research Fellow
- Medical Research Council [G0800523, G0700704B] Funding Source: researchfish
- MRC [G0800523] Funding Source: UKRI
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Specific language impairment (SLI) is a common developmental disorder characterized by difficulties in language acquisition despite otherwise normal development and in the absence of any obvious explanatory factors. We performed a high-density screen of SLI1, a region of chromosome 16q that shows highly significant and consistent linkage to nonword repetition, a measure of phonological short-term memory that is commonly impaired in SLI. Using two independent language-impaired samples, one family-based (211 families) and another selected from a population cohort on the basis of extreme language measures (490 cases), we detected association to two genes in the SLI 1 region: that encoding c-maf-inducing protein (CMIP, minP = 5.5 x 10(-7) at rs6564903) and that encoding calcium-transporting ATPase, type2C, member2 (ATP2C2, minP = 2.0 x 10(-5) at rs11860694). Regression modeling indicated that each of these loci exerts an independent effect upon nonword repetition ability. Despite the consistent findings in language-impaired samples, investigation in a large unselected cohort (n = 3612) did not detect association. We therefore propose that variants in CMIP and ATP2C2 act to modulate phonological short-term memory primarily in the context of language impairment. As such, this investigation supports the hypothesis that some causes of language impairment are distinct from factors that influence normal language variation. This work therefore implicates CMIP and ATP2C2 in the etiology of SLI and provides molecular evidence for the importance of phonological short-term memory in language acquisition.
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