Genetic variation of the growth hormone secretagogue receptor gene is associated with alcohol use disorders identification test scores and smoking
Artikel i vetenskaplig tidskrift, 2016

The multifaceted gut-brain peptide ghrelin and its receptor (GHSR-1a) are implicated in mechanisms regulating not only the energy balance but also the reward circuitry. In our pre-clinical models, we have shown that ghrelin increases whereas GHSR-1a antagonists decrease alcohol consumption and the motivation to consume alcohol in rodents. Moreover, ghrelin signaling is required for the rewarding properties of addictive drugs including alcohol and nicotine in rodents. Given the hereditary component underlying addictive behaviors and disorders, we sought to investigate whether single nucleotide polymorphisms (SNPs) located in the pre-proghrelin gene (GHRL) and GHSR-1a gene (GHSR) are associated with alcohol use, measured by the alcohol use disorders identification test (AUDIT) and smoking. Two SNPs located in GHRL, rs4684677 (Gln90Leu) and rs696217 (Leu72Met), and one in GHSR, rs2948694, were genotyped in a subset (n = 4161) of a Finnish population-based cohort, the Genetics of Sexuality and Aggression project. The effect of these SNPs on AUDIT scores and smoking was investigated using linear and logistic regressions, respectively. We found that the minor allele of the rs2948694 SNP was nominally associated with higher AUDIT scores (P = 0.0204, recessive model) and smoking (P = 0.0002, dominant model). Furthermore, post hoc analyses showed that this risk allele was also associated with increased likelihood of having high level of alcohol problems as determined by AUDIT scores ≥ 16 (P = 0.0043, recessive model). These convergent findings lend further support for the hypothesized involvement of ghrelin signaling in addictive disorders.

substance use disorder

Candidate gene association study

gastrointestinal hormones

Författare

Petra Suchankova

Göteborgs universitet

Staffan Nilsson

Chalmers, Matematiska vetenskaper, matematisk statistik

Göteborgs universitet

Bettina von der Pahlen

Åbo Akademi

Pekka Santtila

Åbo Akademi

Kenneth Sandnabba

Åbo Akademi

Ada Johansson

Göteborgs universitet

Patrick Jern

Åbo Akademi

Turun Yliopisto

Jörgen Engel

Göteborgs universitet

Elisabeth Jerlhag

Göteborgs universitet

Addiction Biology

1355-6215 (ISSN) 1369-1600 (eISSN)

Vol. 21 2 481-488

Ämneskategorier

Medicinsk genetik

DOI

10.1111/adb.12277

PubMed

26059200