Genetic Analysis of Dopamine Receptors (DRD4 and DRD5) in Patients with Autism with Attention Deficit Hyperactivity Disorder (ADHD) in Thi-Qar Province –Iraq | ||||
| Journal of Bioscience and Applied Research | ||||
| Articles in Press, Accepted Manuscript, Available Online from 19 June 2025 | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jbaar.2025.368782.1168 | ||||
 View on SCiNiTO | ||||
| Author | ||||
Hadeel Rashid Faraj  
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| Dept. of Chemistry/ College of Science/University of Thi-Qar Thi-Qar, 64001/Iraq | ||||
| Abstract | ||||
| Autism is a neuro-development disorder which is recently recognized as a public health problem. Attention Deficit Hyperactivity Disorder (ADHD) is a condition that impacts the brain, leading to abnormal levels of hyperactivity and impulsive behavior. The aim of this study is to perform DNA sequencing to identify the genotypes of the DRD4 and DRD5 polymorphisms and to detect any mutations present in the target gene sequences. The study examined the genetic polymorphisms of DRD4 and DRD5 in autism and ADHD patients compared to control groups. For the DRD4 gene, no significant differences were found between the CT and TT genotypes and the wild CC genotype in both autism and control groups (OR 0.92 and OR 0.30, respectively). Five mutations were identified in the DRD4 promoter region. Regarding the DRD5 gene, significant differences were found, particularly for the GA genotype in autism patients (OR 4) and the AA genotype (OR 12), with increased risk associated with the A allele (OR 6.50). In ADHD patients, the GG genotype increased risk by four times (OR 4), while the GA genotype increased it by 4.5 times (OR 4.50). The allele frequencies differed significantly between patients and controls (G: 26.67%, A: 73.33%). Additionally, 11 mutations were documented in the DRD5 gene region. These findings highlight the potential genetic contributions to autism and ADHD our results found that the DRD4 −376 CT genotype associated with development of ADHD. Regarding DRD5 (rs77434921), GA and AA genotypes related with ADHD and autism in Iraqi children. | ||||
| Keywords | ||||
| Autism; ADHD; Dopamine receptor (D4); and Dopamine receptor (D5) | ||||
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