Abstract
Nicotine addiction (NA) is a common and devastating disease, such that the annual number of deaths (world-wide) from tobacco-related diseases will double from 5 million in the year 2000 to 10 million in 2020. Nicotine is the only substance in tobacco which animals and humans will self-administer. NA, as a lifetime diagnosis, has been assessed in various approaches, including the concept of cigarettes per day (CPD). Other assessments of NA are somewhat more comprehensive, such as the Fagerstrom Test for Nicotine Dependence or the American Psychiatric Association's Diagnostic and Statistical Manual (fourth edition) diagnosis of nicotine dependence. These different measures have moderate agreement with one another. Twin, family and adoption studies have shown that these different assessments of NA have substantial heritability (that fraction of risk attributable to genetic factors). The heritability of NA has been estimated at 50–75%, depending on the definition and the population under study. DNA-based studies of NA have been somewhat successful in identifying a common haplotype, which increases risk for NA among European-origin populations. This haplotype explains a small amount of variance, accounting for ∼1 CPD, and it includes the α5 and the α3 nicotinic receptor subunit genes (CHRNA5 and CHRNA3). The review will focus on this implicated region. In this risk region, there is a common (among European-origin people) mis-sense single-nucleotide polymorphism in the CHRNA5 gene (D398N), which changes a conserved amino acid from aspartic acid to asparagine. The risk allele (398N) confers decreased calcium permeability and more extensive desensitization, according to in vitro cellular studies, raising the possibility that a positive allosteric modulator of the (α4β2)2α5 type of nicotinic receptor might have therapeutic potential in NA. There are other genetic influences on NA in this region, apart from the mis-sense variant, and additional biological experiments must be done to understand them.
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Acknowledgements
The authors would like to thank Jon Lindstrom, PhD, Professor of Neuroscience, University of Pennsylvania School of Medicine, for his insights into the CHRNA5 N398D variants. This paper was written with the support of R01 DA 025201, P20 DA 025995, P60 DA 05186 and the VISN 4 Mental Illness Research, Education and Clinical Center (MIRECC, David Oslin, PI) of the Veterans Administration.
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Berrettini, W., Doyle, G. The CHRNA5–A3–B4 gene cluster in nicotine addiction. Mol Psychiatry 17, 856–866 (2012). https://doi.org/10.1038/mp.2011.122
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