It has been suggested that dopamine D3 receptor (DRD3) may have important implications for antipsychotic-induced tardive dyskinesia (TD). Previous studies have demonstrated an association between a serine to glycine polymorphism in the first exon of the DRD3 gene and TD; however, the results have been inconsistent. Therefore, we have replicated these studies using a Chinese sample population. A total of 115 schizophrenic patients from chronic wards were assessed for TD severity using the Abnormal Involuntary Movements Scale (AIMS) and were subsequently genotyped for the DRD3 polymorphism. The mean AIMS score for patients carrying the heterozygote (DRD3ser-gly) was significantly greater than for those with the homozygotes (DRD3ser-ser and DRD3gly-gly). Our results are in line with a previous report, the results of which suggest that the presence of the DRD3ser-gly genotype may be a risk factor for the development of TD in patients treated with antipsychotics.
Peak leg power and habitual gait speed were associated with varying domains of late-life disability. The association between peak leg power and disability seems to be partially mediated through usual gait speed.
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