Abstract
Velocardiofacial/DiGeorge syndrome (VCFS/DGS) is a developmental disorder caused by a 1.5 to 3-Mb hemizygous 22q11.2 deletion. VCFS/DGS patients display malformations in multiple systems, as well as an increased frequency of neuropsychiatric defects including schizophrenia. Haploinsufficiency of TBX1 appears to be responsible for these physical malformations in humans and mice, but the genes responsible for the neuropsychiatric defects are unknown. In this study, two mouse models of VCFS/DGS, a deletion mouse model (Lgdel/+) and a single gene model (Tbx1 +/−), as well as a third mouse mutant (Gscl −/−) for a gene within the Lgdel deletion, were tested in a large behavioral battery designed to assess gross physical features, sensorimotor reflexes, motor activity nociception, acoustic startle, sensorimotor gating, and learning and memory. Lgdel/+ mice contain a 1.5-Mb hemizygous deletion of 27 genes in the orthologous region on MMU 16 and present with impairment in sensorimotor gating, grip strength, and nociception. Tbx1 +/− mice were impaired in grip strength similar to Lgdel/+ mice and movement initiation. Gscl −/− mice were not impaired in any of the administered tests, suggesting that redundant function of other Gsc family members may compensate for the loss of Gscl. Thus, although deletion of the genes in the Lgdel region in mice may recapitulate some of the behavioral phenotypes seen in humans with VCFS/DGS, these phenotypes are not found in mice with complete loss of Gscl or in mice with heterozygous loss of Tbx1, suggesting that the neuropsychiatric and physical malformations of VCFS/DGS may act by different genetic mechanisms.
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Abbreviations
- VCFS/DGS:
-
Velocardiofacial/DiGeorge syndrome
- MMU16:
-
Mouse chromosome 16
- CS:
-
Conditioned stimulus
- US:
-
Unconditioned stimulus
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Acknowledgements
This work was supported by NIEHS Superfund Center Grant P42 ES10337 to A.W.-B., the American Heart Association, the March of Dimes (1-FY02-193) and the National Institutes of Health (HD34980-08 and DC05186-01) to B.E.M., NIH Grant HD 34980 to R.K., and NIH Grant HD 34980 to A.S.
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Long, J.M., LaPorte, P., Merscher, S. et al. Behavior of mice with mutations in the conserved region deleted in velocardiofacial/DiGeorge syndrome. Neurogenetics 7, 247–257 (2006). https://doi.org/10.1007/s10048-006-0054-0
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DOI: https://doi.org/10.1007/s10048-006-0054-0