Transmission disequilibrium and haplotype analyses of the G72/G30 locus: suggestive linkage to schizophrenia in Palestinian Arabs living in the North of Israel.

Association of the G72/G30 locus with schizophrenia was recently reported in French Canadian, Russian, and Ashkenazi populations using case-control studies. In the present study we hypothesize the existence of a G72/G30 risk allele over-transmitted to affected sibs in Palestinian Arab families. A total of 223 Palestinian Arab families that included an affected offspring and parents were genotyped with 11 SNPs encompassing the G72/G30 genes. The families were recruited from three regions of Israel: 56 from the North (Afula), 136 from the central hill region (Bethlehem, Palestinian Authority), and 31 from the South (Beersheva). Individual SNP analyses disclosed a risk allele in SNP rs3916970 by both haplotype relative risk (HRR: chi(2) = 5.59, P = 0.018) and transmission disequilibrium test (TDT: chi(2) = 6.03, P = 0.014) in the Afula families. Follow-up multilocus analysis using family-based association tests (FBAT: z = 2.197, P = 0.028) exposed the adjacent haplotype. SNP rs3916970 is located about 8 kb from the linkage disequilibrium block that was reported to be associated with schizophrenia in Ashkenazi Jews. Excess of similar haplotypes of this region was observed in the Palestinian Arabs and the Ashkenazi patients. These data suggest a common risk factor for schizophrenia susceptibility in the G72/G30 locus among Ashkenazi Jews and Palestinian Arabs. The results strengthen previous reports on the role of this locus in the etiology of schizophrenia.

Elderly psychiatric patients at risk of folic acid deficiency: a case controlled study.

In the elderly, folic acid deficiency may result in psychiatric symptoms or the increases in severity of other organic and non-organic mental diseases. We aimed to characterize elderly, community-dwelling, newly admitted patients to a large urban psychiatric hospital who are suffering from untreated folic acid deficiency in comparison with elderly inpatients who do not suffer from this deficiency. During a 2-year period, all subjects aged 65 years or older admitted to the large psychiatric center were tested for levels of serum folic acid levels. Subjects suffering from folic acid deficiency were compared (unpaired t-test) with matched patients with normal serum levels. Of the 293 newly admitted elderly patients 45 (15.7%) suffered from folic acid deficiency. Mean age for the folic acid deficient group was 77.3+/-8.1 years, 38% were diagnosed as suffering from dementia, 22% were depressed and 51% were living alone. In the comparison group mean age was 77.3+/-6.3 years, 33% were diagnosed as suffering from dementia, 24% were suffering from depression and 57% were living alone. We conclude that we could not find any "characteristic" of elderly subjects at risk of folic acid deficiency.