Análise citogenética em alta resolução de 2q37 e 22q13 e molecular do gene SHANK3 em doenças do espectro autístico
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Data
2010-02-24
Autores
Martins, Ana Luiza Bossolani [UNESP]
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Editor
Universidade Estadual Paulista (Unesp)
Resumo
As Doenças do Espectro Autístico incluem o Autismo, o Transtorno Invasivo do Desenvolvimento Sem Outra Especificação e a Síndrome de Asperger. A etiologia é muito discutida, devido a sua variação e complexidade. São doenças que se manifestam nos três primeiros anos de vida, com uma variação clínica que inclui comportamento ritualístico, fala ausente ou pouco desenvolvida, além de problemas graves de relacionamento. Em 5 a 37 % dos casos são observadas em comorbidade com outras afecções. Em indivíduos com estas doenças já foram descritas alterações em todos os cromossomos e há genes propostos como candidatos de estarem envolvidos na etiopatogenia. Também, há relatos de casos com alterações subteloméricas, especialmente deleções, envolvendo as extremidades distais dos braços longos dos cromossomos 2 e 22. Mais recentemente foram observadas mutações no gene SHANK3, que está localizado em 22q13.3, na população com Doenças do Espectro Autístico. Este trabalho apresenta os resultados de um estudo citogenético e molecular realizado em 48 indivíduos com doenças do espectro autístico. Foram estudados o cariótipo por bandamento GTG convencional, as regiões 2q37 e 22q13 pela técnica de bandamento GTG em alta resolução, os éxons 8 e 22 do gene SHANK3 por seqüenciamento direto. A análise cariotípica convencional e dos éxons 8 e 22 revelaram resultados normais. A análise em alta resolução de um indivíduo mostrou resultado com possível deleção em 2q37, que não foi confirmada por técnica complementar. O número restrito de pacientes estudados deve ser considerado, porém pode ser sugerido que alterações em 2q37, 22q13 e dos éxons 8 e 22 do gene SHANK3, sejam eventos mais raros do que se supunha em Doenças do Espectro Autístico e sua investigação pode ser indicada na triagem de pacientes e para o aconselhamento genético...
The autism spectrum disorders including autism, Pervasive Developmental Disorder Not Otherwise Specified and Asperger syndrome. The etiology is much debated due to its variation and complexity. These are disorders that are manifested in the first three years of life, with a clinical variant that includes ritualistic behavior, speech absent or poorly developed, in addition to serious relationship. In 5 to 37% of cases are observed in association with other diseases. In individuals with these diseases have been described changes in all chromosomes and genes are proposed as candidates to be involved in pathogenesis. Also, there are reports of cases with subtelomeric changes, especially deletions involving the distal ends of the long arms of chromosomes 2 and 22. More recently, mutations were observed in the gene SHANK3, which is located on 22q13.3, in the population with autism spectrum disorders. This paper presents the results of a cytogenetic and molecular study performed in 48 individuals with autistic spectrum disorders. We studied the karyotype by GTG conventional regions 2q37 and 22q13 by GTG banding technique in high resolution, the exons 8 and 22 SHANK3 gene by direct sequencing. The conventional karyotype analysis and exons 8 and 22 point normal results. The high resolution analysis of an individual with demonstrated results possible deletion in 2q37, which was not confirmed by complementary technique. The small number of patients should be considered, but may be suggested that changes in 2q37, 22q13 and exons 8 and 22 of the gene SHANK3, are more rare than previously thought on the autism spectrum disorders and their investigation may be indicated in screening of patients for genetic counseling of families is not justified. However, these investigations could be cited in this population when it is selected for the presence of dysmorphic features indicative of possible... (Complete abstract click electronic access below)
The autism spectrum disorders including autism, Pervasive Developmental Disorder Not Otherwise Specified and Asperger syndrome. The etiology is much debated due to its variation and complexity. These are disorders that are manifested in the first three years of life, with a clinical variant that includes ritualistic behavior, speech absent or poorly developed, in addition to serious relationship. In 5 to 37% of cases are observed in association with other diseases. In individuals with these diseases have been described changes in all chromosomes and genes are proposed as candidates to be involved in pathogenesis. Also, there are reports of cases with subtelomeric changes, especially deletions involving the distal ends of the long arms of chromosomes 2 and 22. More recently, mutations were observed in the gene SHANK3, which is located on 22q13.3, in the population with autism spectrum disorders. This paper presents the results of a cytogenetic and molecular study performed in 48 individuals with autistic spectrum disorders. We studied the karyotype by GTG conventional regions 2q37 and 22q13 by GTG banding technique in high resolution, the exons 8 and 22 SHANK3 gene by direct sequencing. The conventional karyotype analysis and exons 8 and 22 point normal results. The high resolution analysis of an individual with demonstrated results possible deletion in 2q37, which was not confirmed by complementary technique. The small number of patients should be considered, but may be suggested that changes in 2q37, 22q13 and exons 8 and 22 of the gene SHANK3, are more rare than previously thought on the autism spectrum disorders and their investigation may be indicated in screening of patients for genetic counseling of families is not justified. However, these investigations could be cited in this population when it is selected for the presence of dysmorphic features indicative of possible... (Complete abstract click electronic access below)
Descrição
Palavras-chave
Autistic spectrum disorders, HANK3, Citogenética, Autismo em crianças - Aspectos genéticos, Crianças - Desvio do desenvolvimento, Doenças do espectro autístico - Aspectos genéticos, 2q37, 22q13
Como citar
MARTINS, Ana Luiza Bossolani. Análise citogenética em alta resolução de 2q37 e 22q13 e molecular do gene SHANK3 em doenças do espectro autístico. 2010. 86 f. Dissertação (mestrado) - Universidade Estadual Paulista, Instituto de Biociências, Letras e Ciências Exatas, 2010.