Genotype-phenotype correlation in Brazillian Rett syndrome patients

De Lima F.T.; Brunoni D.; Schwartzman J.S.; Pozzi M.C.; Kok F.; Juliano Y.; Pereira L.D.V.

Genotype-phenotype correlation in Brazillian Rett syndrome patients

item.page.type

Artigo

Date

2009

item.page.ispartof

Arquivos de Neuro-Psiquiatria

item.page.citationsscopus

8

Authors

De Lima F.T.
Brunoni D.
Schwartzman J.S.
Pozzi M.C.
Kok F.
Juliano Y.
Pereira L.D.V.

Abstract

Background: Rett syndrome (RS) is a severe neurodevelopmental X-linked dominant disorder caused by mutations in the MECP2 gene. Purpose: To search for point mutations on the MECP2 gene and to establish a correlation between the main point mutations found and the phenotype. Method: Clinical evaluation of 105 patients, following a standard protocol. Detection of point mutations on the MECP2 gene was performed on peripheral blood DNA by sequencing the coding region of the gene. Results: Classical RS was seen in 68% of the patients. Pathogenic point mutations were found in 64.1% of all patients and in 70.42% of those with the classical phenotype. Four new sequence variations were found, and their nature suggests patogenicity. Genotype-phenotype correlations were performed. Conclusion: Detailed clinical descriptions and identification of the underlying genetic alterations of this Brazilian RS population add to our knowledge of genotype/phenotype correlations, guiding the implementation of mutation searching programs.