title: Candidate pathway association study in cocaine dependence: the control of neurotransmitter release.
abstract: OBJECTIVE
  Cocaine is the second most used illegal drug in Europe. The transition from use to dependence involves both genetic and environmental factors. Genetic variation in neurotransmitter systems is involved in the susceptibility to cocaine dependence. We examined the possible contribution to cocaine dependence of 16 genes involved in the cellular machinery that controls neurotransmitter release: genes encoding proteins of the SNARE complex (STX1A, SNAP25, VAMP1 and VAMP2), fusion control elements (SYT1, SYT2, CPLX1, CPLX2, CPLX3 and CPLX4) and regulatory elements (STXBP1, SYP, SNPH, NSF, NAPA and RAB3A).
  
  
  METHODS
  We genotyped 121 SNPs, selected according to genetic coverage criteria, in 360 cocaine-dependent patients and 360 controls from Spain.
  
  
  RESULTS
  Single and multiple-marker analyses revealed a strong association between cocaine dependence and the NSF gene, encoding the N-ethylmaleimide-sensitive factor (P = 5.1e-04, OR = 2.44 (1.45-4.00) and P = 0.001, OR = 1.82 (1.28-2.59), respectively). The presence and absence of psychotic symptoms were also studied. Interestingly, when we considered the time between initial consumption and the onset of cocaine dependence, we observed that the association was mainly restricted to the group of patients that rapidly developed drug dependence (≤ 2 years; P = 2.98e-06, OR = 1.33 (1.20-1.47)).
  
  
  CONCLUSIONS
  Our data show preliminary evidence that NSF may predispose not only to cocaine dependence, but also to an early onset of the dependence.
authors.affiliation: Departament de Genètica, Facultat de Biologia, Universitat de Barcelona, Catalonia, Spain.
authors.forename: Noèlia
authors.initials: N
authors.lastname: Fernàndez-Castillo
authors.forename: Bru
authors.initials: B
authors.lastname: Cormand
authors.forename: Carlos
authors.initials: C
authors.lastname: Roncero
authors.forename: Cristina
authors.initials: C
authors.lastname: Sánchez-Mora
authors.forename: Lara
authors.initials: L
authors.lastname: Grau-Lopez
authors.forename: Begoña
authors.initials: B
authors.lastname: Gonzalvo
authors.forename: Laia
authors.initials: L
authors.lastname: Miquel
authors.forename: Roser
authors.initials: R
authors.lastname: Corominas
authors.forename: Josep Antoni
authors.initials: JA
authors.lastname: Ramos-Quiroga
authors.forename: Miquel
authors.initials: M
authors.lastname: Casas
authors.forename: Marta
authors.initials: M
authors.lastname: Ribasés
mesh_terms: D000328:Adult; D019970:Cocaine-Related Disorders / Q000235:genetics*; D005260:Female; D020022:Genetic Predisposition to Disease; D005838:Genotype; D006239:Haplotypes; D006801:Humans; D008297:Male; D008875:Middle Aged; D052066:N-Ethylmaleimide-Sensitive Proteins / Q000235:genetics* / Q000378:metabolism; D020641:Polymorphism, Single Nucleotide; D011618:Psychotic Disorders / Q000235:genetics; D013030:Spain; D009435:Synaptic Transmission / Q000235:genetics
chemical_list: D052066:N-Ethylmaleimide-Sensitive Proteins