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This study is the first to examine the genetics of autism in African Americans, even though the disorder occurs equally across ethnic groups. Gene studies in African-American autism families are rare. Duke University researchers believe the finding will be critical to developing new treatments for both African Americans and Whites. The study of 54 African American families and 557 Caucasian families in which a member had autism were analyzed. Researchers analyzed genes that regulate a brain chemical or neurotransmitter called GABA along chromosome 15. Chromosome 15 has been linked to autism. GABA slows down nerve cells from firing once their message has been transmitted. In this way, the neurotransmitter acts as an information filter that prevents the brain from becoming over-stimulated. If the GABA system malfunctions, the brain can be flooded with sensory information that overwhelms the brain's processing capabilities, leading to some of the behaviors that characterize autism, said Michael Cuccaro, Ph.D ., a Duke clinical psychologist and study co-author. According to a study co-author, if the GABA system malfunctions, the brain can be flooded with sensory information that overwhelms the brain's processing capabilities leading to some of the behaviors that characterize autism. Researchers found that in African Americans and Caucasians, the contact of two malfunctioning GABA receptor genes -- GABRB1 and GABRA4 -- can increase the risk of autism. GABA receptors are docking sites on the surface of brain cell neurons. GABA binds to these docking sites and keeps the neurons from firing. GABRA4 increases the risk of autism, and its communication with GABRB1 further increases the risk of autism. Autism medications, including diazepam (a sedative) and certain antiepileptic drugs already target the GABA system in a wide-ranging manner. Understanding the precise gene to gene interaction may help scientists develop new drugs that specifically target the genes. Scientists believe as many as 100 genes may be involved in autism. Each ethnic group has unique genes that can interact with autism-associated genes to slightly change the course of the disease. For example, certain symptoms associated with autism, such as delayed language development and problems handling daily life tasks, are more severe in African American individuals with autism than in Caucasians. Such differences make it important to understand the range of underlying genes that add to the disorder in other ethnic groups. The most effective drugs are those which aim at the specific genes that are malfunctioning, so researchers must look further to identify which genes play a role for each ethnic group.
Study by National Institutes of Health, the National Alliance of Autism Research, the Hussman Foundation and the Autism Genetic Resource Exchange.
More African Americans and Autism-Related ResearchJ Autism Dev Disord. 1996 Aug;26(4):461-9.Professional perceptions of children with developmental difficulties: the influence of race and socioeconomic status. Cuccaro ML, Wright HH, Rownd CV, Abramson RK, Waller J, Fender D. University of South Carolina School of Medicine, Columbia, USA.
PMID: 8863096 [PubMed - indexed for MEDLINE]
http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=pubmed&dopt=Abstract&list_uids=1836108&query_hl=5
Empowering low-income black families of handicapped children. Kalyanpur M, Rao SS. Division of Special Education and Rehabilitation, School of Education, Syracuse University, N.Y. A qualitative study of four black, low-income, single mothers used in-depth interviews and participant observation to evaluate their interactions with outreach agency professionals. Three perceived aspects (disrespect, focus on deficits, and discounting parenting style differences) were associated with exclusionary (unempowering) relationships. A reciprocal and supportive approach was associated with collaborative (empowering) relationships. Implications of these findings for professionals serving minority families are discussed. PMID: 1836108 [PubMed - indexed for MEDLINE]
African Americans and
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