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Presencia de los alelos DRD4/7R y DAT1/10R en miembros de familias chilenas con síndrome de déficit atencional con hiperactividad / Presence of DRD4/7R and DAT1/10R allele in Chilean family members with attention deficit hyperactivity disorder
Carrasco, X; Rothhammer, P; Moraga, M; Henríquez, H; Aboitiz, F; Rothhammer, F.
  • Carrasco, X; Universidad de Chile. Facultad de Medicina. Instituto de Ciencias Biomédicas. Santiago. CL
  • Rothhammer, P; Universidad de Chile. Facultad de Medicina. Instituto de Ciencias Biomédicas. Santiago. CL
  • Moraga, M; Universidad de Chile. Facultad de Medicina. Instituto de Ciencias Biomédicas. Santiago. CL
  • Henríquez, H; Universidad de Chile. Facultad de Medicina. Instituto de Ciencias Biomédicas. Santiago. CL
  • Aboitiz, F; Pontificia Universidad Católica de Chile. Escuela de Medicina. Departamento de Psiquiatría. CL
  • Rothhammer, F; Universidad de Chile. Facultad de Medicina. Instituto de Ciencias Biomédicas. Santiago. CL
Rev. méd. Chile ; 132(9): 1047-1052, sept. 2004. tab
Article in Spanish | LILACS | ID: lil-443222
ABSTRACT

BACKGROUND:

Genes for dopamine receptor DRD4 and dopamine transporter DAT1 have been implicated in attention deficit with hyperactivity disorder (ADHD). However, the findings are not conclusive. More studies in populations with different genetic backgrounds may contribute to solve the discrepancies observed.

AIM:

To test the hypothesis that affected members of Chilean families exhibit higher frequencies of the DRD4/7R and DAT1/10R alleles then their healthy sibs. MATERIAL AND

METHODS:

The parents of 51 children belonging to families of the Metropolitan Region of Chile, were approached to obtain clinical histories and blood samples, after the signature of a written informed consent. ADHD was diagnosed according to DSM-IV criteria, ancd intellectual coefficient was tested using the WISC-R test. Genomic DNA was extracted from lymphocytes and amplified by PCR.

RESULTS:

The 7R allele was identified in 13 out of 26 subjects diagnosed as ADHD and in 6 of 25 healthy sibs (p < 0.05). Parents with a history of ADHD, were conmpared with their healthy counterparts, exhibiting an identical tendency, that did not reach statistical significance. No significant differences in the frequencies of DAT1/10R alleles, were observed between cases and controls or their parents.

CONCLUSIONS:

Our results showed that ADHD in Chilean families is associated with the presence of DRD4/7R allele.
Subject(s)
Full text: Available Index: LILACS (Americas) Main subject: Membrane Transport Proteins / Attention Deficit Disorder with Hyperactivity / Membrane Glycoproteins / Gene Frequency / Nerve Tissue Proteins Type of study: Diagnostic study / Observational study / Prognostic study / Risk factors Limits: Adolescent / Child / Female / Humans / Male Country/Region as subject: South America / Chile Language: Spanish Journal: Rev. méd. Chile Journal subject: Medicine Year: 2004 Type: Article Affiliation country: Chile Institution/Affiliation country: Pontificia Universidad Católica de Chile/CL / Universidad de Chile/CL

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Full text: Available Index: LILACS (Americas) Main subject: Membrane Transport Proteins / Attention Deficit Disorder with Hyperactivity / Membrane Glycoproteins / Gene Frequency / Nerve Tissue Proteins Type of study: Diagnostic study / Observational study / Prognostic study / Risk factors Limits: Adolescent / Child / Female / Humans / Male Country/Region as subject: South America / Chile Language: Spanish Journal: Rev. méd. Chile Journal subject: Medicine Year: 2004 Type: Article Affiliation country: Chile Institution/Affiliation country: Pontificia Universidad Católica de Chile/CL / Universidad de Chile/CL