6 research outputs found
Adenoma de las glĂĄndulas de Brunner
El adenoma de glĂĄndulas de Brunner representa el 10% de los tumores benignos del
duodeno. Su localizaciĂłn mĂĄs frecuente es en la primera porciĂłn del duodeno y es
extremadamente raro por debajo de la ampolla de Vater. Presentamos dos casos, uno de
ellos asociado a adenocarcinoma de la ampolla de Vater. Esta asociaciĂłn no estĂĄ
descrita en la literatura. No existe ningĂșn caso en que se demuestre una transformaciĂłn
de adenoma a adenocarcinoma. Para estas lesiones nodulares solitarias es mĂĄs correcto
el tĂ©rmino de adenoma que el de hiperplasia, debiĂ©ndose reservar este Ășltimo para las
proliferaciones mĂĄs difusas
The Variant rs1867277 in FOXE1 Gene Confers Thyroid Cancer Susceptibility through the Recruitment of USF1/USF2 Transcription Factors
In order to identify genetic factors related to thyroid cancer susceptibility, we adopted a candidate gene approach. We studied tag- and putative functional SNPs in genes involved in thyroid cell differentiation and proliferation, and in genes found to be differentially expressed in thyroid carcinoma. A total of 768 SNPs in 97 genes were genotyped in a Spanish series of 615 cases and 525 controls, the former comprising the largest collection of patients with this pathology from a single population studied to date. SNPs in an LD block spanning the entire FOXE1 gene showed the strongest evidence of association with papillary thyroid carcinoma susceptibility. This association was validated in a second stage of the study that included an independent Italian series of 482 patients and 532 controls. The strongest association results were observed for rs1867277 (OR[per-allele]â=â1.49; 95%CIâ=â1.30â1.70; Pâ=â5.9Ă10â9). Functional assays of rs1867277 (NM_004473.3:c.â283G>A) within the FOXE1 5âČ UTR suggested that this variant affects FOXE1 transcription. DNA-binding assays demonstrated that, exclusively, the sequence containing the A allele recruited the USF1/USF2 transcription factors, while both alleles formed a complex in which DREAM/CREB/αCREM participated. Transfection studies showed an allele-dependent transcriptional regulation of FOXE1. We propose a FOXE1 regulation model dependent on the rs1867277 genotype, indicating that this SNP is a causal variant in thyroid cancer susceptibility. Our results constitute the first functional explanation for an association identified by a GWAS and thereby elucidate a mechanism of thyroid cancer susceptibility. They also attest to the efficacy of candidate gene approaches in the GWAS era
Adenoma de las glĂĄndulas de Brunner
El adenoma de glĂĄndulas de Brunner representa el 10% de los tumores benignos del
duodeno. Su localizaciĂłn mĂĄs frecuente es en la primera porciĂłn del duodeno y es
extremadamente raro por debajo de la ampolla de Vater. Presentamos dos casos, uno de
ellos asociado a adenocarcinoma de la ampolla de Vater. Esta asociaciĂłn no estĂĄ
descrita en la literatura. No existe ningĂșn caso en que se demuestre una transformaciĂłn
de adenoma a adenocarcinoma. Para estas lesiones nodulares solitarias es mĂĄs correcto
el tĂ©rmino de adenoma que el de hiperplasia, debiĂ©ndose reservar este Ășltimo para las
proliferaciones mĂĄs difusas