Abstract
The tryptophan hydroxylase 2 gene (TPH2) was resequenced at the 5′ upstream, coding, and 3′ downstream regions, including all 11 exons in 185 subjects. Twenty-three novel and 14 known variants were identified. In a cohort of 583 consecutively ascertained subjects, including normal volunteers and those with specific addictive diseases, six common TPH2 and one TPH1 variant were genotyped. Allele frequencies of three TPH2 variants and the TPH1 variant varied significantly among the four ethnic groups within the control subjects. Of these subjects, 385 who met heroin addiction or control criteria and were of Caucasian, African-American, or Hispanic ethnicity were examined for potential association with vulnerability to develop heroin addiction. At the two locus genotype level in Hispanics, the TPH1 rs1799913 variant was found to significantly interact with the TPH2 rs7963720 variant and heroin addiction (P = 0.022), and with the TPH2 rs4290270 variant and heroin addiction (P = 0.011). In the African-American group, a significant association of a specific TPH2 haplotype with heroin addiction also was found (SNPHAP, P = 0.004; PHASE P = 0.036).
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Acknowledgements
We thank Kathy Bell, R.N., Elizabeth Ducat, R.N., Dorothy Melia, R.N., Lisa Borg, M.D., Pauline McHugh, M.D., James Schluger, M.D., and Heather Hofflich, D.O. for recruiting, screening, and assessment of study subjects, Matthew Randesi for sequencing assistance, and Bronson E. Oosterhuis and Julia Allen for re-reading of the sequencing electropherograms. We are grateful to Vadim Yuferov, Ph.D., Stefan Schlussman, Ph.D., Orna Levran, Ph.D., and K. Steven LaForge, Ph.D. for critical review of this manuscript. We thank Susan Russo for help in manuscript preparation. This study was supported by NIH-NIDA Grants K05-DA00049 (M.J.K.) and RO1-DA12848 (M.J.K.), NIH-RR UL1RR024143 (B.C.), NIH-MH R01-44292 (J.O.), and NSFC grant 30730057 from the Chinese Government (J.O.).
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Nielsen, D.A., Barral, S., Proudnikov, D. et al. TPH2 and TPH1: Association of Variants and Interactions with Heroin Addiction. Behav Genet 38, 133–150 (2008). https://doi.org/10.1007/s10519-007-9187-7
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DOI: https://doi.org/10.1007/s10519-007-9187-7