Evaluation of linkage of markers on chromosome 6p with schizophrenia in Taiwanese families

• Published in: American journal of medical genetics 2000-02, Vol.96 (1), p.74-78
• Main Authors: Hwu, Hai-Gwo, Lin, Ming-Wei, Lee, Ping-Chuan, Lee, Sandy F-C, Ou-Yang, Wen-Chen, Liu, Chih-Min
• Format: Article
• Language: English
• Subjects: Adolescent; Adult; Adult and adolescent clinical studies; Biological and medical sciences; chromosome 6p; Chromosomes, Human, Pair 6; Female; Genetic Linkage; Genetic Markers; genotyping; Humans; linkage; Male; Medical sciences; Psychology. Psychoanalysis. Psychiatry; Psychopathology. Psychiatry; Psychoses; Schizophrenia; Schizophrenia - ethnology; Schizophrenia - genetics; Taiwan; Tropical medicine
• ISSN: 0148-7299; 1096-8628
• DOI: 10.1002/(SICI)1096-8628(20000207)96:1<74::AID-AJMG15>3.0.CO;2-G

Previous studies have indicated possible linkage of schizophrenia with chromosome 6p21‐24. In an attempt to replicate these findings, we studied the linkage of schizophrenia with nine markers on chromosome 6p21‐24 in 39 Taiwanese schizophrenic nuclear families with at least two affected siblings. Two diagnostic models (narrow: Diagnostic and Statistical Manual of Mental Disorders‐IV schizophrenia only; and broad: including schizophrenia, schizoaffective, and other nonaffective psychotic disorders) were used to define the disease phenotypes. With the broad and narrow diagnostic models, the marker D6S296 produced maximum two‐point lod scores of 1.46 (θ = 0.2) and 1.35 (θ = 0.2), respectively, in the recessive inheritance model. Assuming locus heterogeneity, a multipoint lod score of 0.85 was obtained between markers D6S296 and D6S277 under the narrow/recessive model. Maximum nonparametric lod scores of 1.25 ( p= 0.09) and 1.36 (p = 0.08) were observed, but still not statistically significant, at D6S296 in the narrow and broad diagnostic models, respectively. Both two‐point analysis of the dominant model (lod score 0.85) and nonparametric analysis (lod score 1.25) showed a mild peak lod score appeared at marker D6S 285 as well. The results add some support to the suggestive linkage of schizophrenia with markers in the regions of chromosome 6p22 and 6p24 in an ethnically distinct Taiwanese sample. Am. J. Med. Genet. (Neuropsychiatr. Genet.) 96:74–78, 2000. © 2000 Wiley‐Liss, Inc.