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Several lines of evidence suggest that presence of a D2 dopamine receptor (DRD2) gene variant marked by TaqI restriction fragment length polymorphisms (RFLPs) might contribute to vulnerability
to substance abuse. Psychostimulants display the most robust enhancement of dopamine
activity in mesolimbic/mesocortical circuits important for behavioral reward. The
present study tests the hypothesis that a DRD2 gene variant might be more prominent
in polysubstance users who preferentially use psychostimulants than in addicts with
preferential opiate use or in those with no drug preference. Polysubstance users with
histories of heavy daily preferential psychostimulant use more often displayed one
or two copies of the TaqI A1 (27/62 = 43.5% vs 33/119 = 27.7% for controls), and B1 (20/62 = 32.3% vs 23/119
= 19.8% for controls) markers at the DRD2 locus. DRD2 gene marker distributions in
abusers with more prominent opiate use, or those with no history of drug preference,
were similar to control genotypes. Psychostimulant-preferring drug users also reported
earlier onset of psychostimulant use. Our data are consistent with the hypothesis
that DRD2 gene variants marked by these polymorphisms may work, probably in concert
with other genetic and environmental factors, to enhance vulnerability to psychostimulant
abuse.
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Article info
Publication history
Received in revised form:
September 6,
1995
Received:
June 3,
1994
Footnotes
This work was supported by the Intramural Research Program of the National Institute on Drug Abuse and by NIDA grant DA07110 to F.H.G.
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© 1996 Society of Biological Psychiatry. Published by Elsevier Inc.
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