RESUMO
PURPOSE: To localize and identify the gene and mutations causing autosomal recessive retinal dystrophy in two consanguineous Pakistani families. METHODS: Consanguineous families from Pakistan were ascertained to be affected with autosomal recessive retinal degeneration. All affected individuals underwent thorough ophthalmologic examinations. Blood samples were collected, and genomic DNA was extracted using a salting out procedure. Genotyping was performed using microsatellite markers spaced at approximately 10 cM intervals. Two-point linkage analysis was performed with the lod score method. Direct DNA sequencing of amplified genomic DNA was performed for mutation screening of candidate genes. RESULTS: Genome-wide linkage scans yielded a lod score of 3.05 at θ=0 for D17S1832 and 3.82 at θ=0 for D17S938, localizing the disease gene to a 12.22 cM (6.64 Mb) region flanked by D17S1828 and D17S1852 for family 61032 and family 61227, which contains aryl hydrocarbon receptor interacting protein-like 1 (AIPL1), a gene previously implicated in recessive Leber congenital amaurosis and autosomal dominant cone-rod dystrophy. Sequencing of AIPL1 showed a homozygous c.773G>C (p.Arg258Pro) sequence change in all affected individuals of family 61032 and a homozygous c.465G>T (p.(H93_Q155del)) change in all affected members of family 61227. CONCLUSIONS: The results strongly suggest that the c.773G>C (p.R258P) and c.465G>T (p.(H93_Q155del)) mutations in AIPL1 cause autosomal recessive retinal degeneration in these consanguineous Pakistani families.
Assuntos
Proteínas de Transporte/genética , Cromossomos Humanos Par 17/genética , Proteínas do Olho/genética , Genes Recessivos/genética , Degeneração Retiniana/genética , Proteínas Adaptadoras de Transdução de Sinal , Adulto , Sequência de Aminoácidos , Proteínas de Transporte/química , Eletrorretinografia , Proteínas do Olho/química , Família , Feminino , Fundo de Olho , Haplótipos/genética , Humanos , Escore Lod , Masculino , Pessoa de Meia-Idade , Dados de Sequência Molecular , Mutação/genética , Paquistão , Linhagem , Estrutura Terciária de Proteína , Sítios de Splice de RNA/genéticaRESUMO
This study was undertaken to evaluate the expression of DMBT1 in bladder cancer and its correlation with clinico-pathological parameters analyzed in bladder carcinoma patients. We investigated DMBT1 in 56 paraffin embedded specimens of transitional cell carcinoma of the urinary bladder. We assessed DMBT1 gene expression at mRNA level by RT-PCR. Our results show 100% expression of DMBT1 in bladder carcinoma samples. Due to this preliminary results; gene expression was compared to tumor grade, and a significant difference was detected between grade 1 and 3 (p = 0.028). The down-regulation of DMBT1 gene expression in carcinomas suggests the possible role in bladder cancer.