1. Does telomere length mediate associations between inbreeding and increased risk for bipolar I disorder and schizophrenia?
- Author
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Farha A El-Chennawi, Zeinab Gomaa, Ahmed Eissa, Amal Yassin, Mikhil Bamne, Hala Salah, Ibtihal Ibrahim, Nahed E. Ibrahim, Warda Fathi, Mai Elassy, Hanan Elsayed, Kodavali V. Chowdari, Hader Mansour, Wafaa El-Bahaei, Mohamed El-Sayed, Vishwajit L. Nimgaonkar, Hala El-Boraie, Salwa Tobar, and Joel Wood
- Subjects
Adult ,Male ,medicine.medical_specialty ,Bipolar Disorder ,Bipolar I disorder ,Consanguinity ,Biology ,Young Adult ,Risk Factors ,Internal medicine ,medicine ,Humans ,Genetic Predisposition to Disease ,Inbreeding ,Bipolar disorder ,Risk factor ,Biological Psychiatry ,Genetics ,Analysis of Variance ,Case-control study ,Telomere ,medicine.disease ,Psychiatry and Mental health ,Endocrinology ,Mood disorders ,Schizophrenia ,Case-Control Studies ,Linear Models ,Egypt ,Female - Abstract
We have recently found that consanguinity is a risk factor for bipolar I disorder (BP1) and schizophrenia (SZ) in Egypt. Inbreeding has been associated with increased cellular stress and impaired physiological function in plants and animals. Previous studies have reported that telomere length (TL), an index of oxidative stress and cellular senescence is significantly reduced among patients with SZ or mood disorders compared with control individuals. Hence we evaluated TL as a possible mediator of the observed association between consanguinity and BP1/SZ risk. Patients with BP1 (n=108), or SZ (n=60) were compared with screened adult controls in separate experiments. TL was estimated using a quantitative PCR (qPCR) based assay. The inbreeding coefficient/consanguinity rate was estimated in two ways: using 64 DNA polymorphisms ('DNA-based' rate); and from family history data ('self report'). Significant correlation between TL and DNA based inbreeding was not observed overall, though suggestive trends were present among the SZ cases. No significant case-control differences in TL were found after controlling for demographic variables. In conclusion, reduced TL may not explain a significant proportion of observed associations between consanguinity and risk for BP1/SZ.
- Published
- 2011
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