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Neurosci Lett. 2015 Mar 17;590:91-5. doi: 10.1016/j.neulet.2015.01.027. Epub 2015 Jan 14.

The serotonin transporter (5-HTTLPR) but not serotonin receptor (5-HT2C Cys23Ser) variant is associated with bipolar I disorder in Kurdish population from Western Iran.

Author information

1
Department of Clinical Biochemistry, Kermanshah University of Medical Sciences, Kermanshah, Iran.
2
Department of Psychiatry, Kermanshah University of Medical Sciences, Kermanshah, Iran.
3
Medical Biology Research Center, Kermanshah University of Medical Sciences, Kermanshah, Iran.
4
Department of Biotechnology, University of Kurdistan, Sanandaj, Iran.
5
Department of Clinical Biochemistry, Kermanshah University of Medical Sciences, Kermanshah, Iran; Medical Biology Research Center, Kermanshah University of Medical Sciences, Kermanshah, Iran. Electronic address: zrahimi@kums.ac.ir.

Abstract

The role of 5-HTTLPR and 5-HT2C Cys23Ser polymorphisms in the psychopathology of mood disorders and suicide behavior is controversial. The aim of present study was to investigate the association between 5-HTTLPR and 5-HT2C Cys23Ser variants and susceptibility to bipolar I disorder (BID). The 5-HT2C genotypes were studied in 152 patients with BID and 173 gender- and age-matched healthy individuals with Kurds ethnic background from Western Iran using PCR and PCR-RFLP methods. In recessive model (SS vs. LL+LS) the SS genotype was associated with 1.79-fold increased risk of BID (p=0.018). Also, the presence of S allele increased the risk of adult-onset BID by 1.76-fold (p=0.027). No association was detected between 5-HTTLPR genotypes and alleles with suicide attempt. The frequency of 5-HT2C Ser allele in patients and controls were 12.3 and 12.5%, respectively. Mutant allele of HT2C Ser had higher frequency in female (14.7%) than male (10.5%, p=0.27) patients. The frequency of HT2C Ser allele in patients with a family history of BID tended to be higher (15.7%) than those without a family history of the disease (11.8%). The frequency of HT2C Ser allele in suicide attempter women was higher (16.7%) than those without a suicide attempt (14.3%). Our findings demonstrate 5-HTTLPR polymorphism might be a risk factor for BID and adult-onset BID in Kurds population. However, we found the lack of an association between 5-HT2C Cys/Ser variants and the risk of BID.

KEYWORDS:

5-HT2C Cys/Ser; 5-HTTLPR; Bipolar I disorder; Polymorphism; Suicide; Western Iran

PMID:
25596490
DOI:
10.1016/j.neulet.2015.01.027
[Indexed for MEDLINE]

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