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Master's Dissertation
DOI
10.11606/D.5.2011.tde-11012012-152825
Document
Author
Full name
Elisangela Pereira de Souza Quedas
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2011
Supervisor
Committee
Toledo, Sergio Pereira de Almeida (President)
Monte, Osmar
Rubio, Ileana Gabriela Sanchez de
Title in Portuguese
Análise do proto-oncogene RET em pacientes com carcinoma medular de tireóide e megacólon congênito de uma família com mutação germinativa p.C620R
Keywords in Portuguese
Carcinoma medular de tireóide
Doença de Hirschsprung
Feocromocitoma
Hiperparatireoidismo primário
Neoplasia endócrina múltipla tipo 2a
RET
Abstract in Portuguese
As Neoplasias endócrinas múltiplas (NEMs) são síndromes herdadas de modo dominante e causadas por mutações germinativas em genes específicos. Caracterizam-se pela presença de tumores em um conjunto de glândulas endócrinas, conjunto este típico de cada tipo-específico de NEM. Dentre os diferentes tipos de NEMs, há a neoplasia endócrina múltipla tipo 2 (NEM2) que envolve os fenótipos, carcinoma medular de tireóide (CMT), hiperparatiroidismo primário (HPT), feocromocitoma (FEO) e megacólon congênito (doença de Hirschsprung, HSCR). Apesar da prevalência da NEM2 na população em geral ser baixa (~ 1:30.000), o número de casos afetados por família pode ser expressivo, uma vez que sua penetrância é praticamente completa (~100%). A doença de HSCR ou aganglionose intestinal congênita quando ocorre está geralmente associada à mutações RET nos códons 609, 618 e 620; apresenta ampla variação fenotípica, padrão de herança complexa e baixa penetrancia. Poucos casos de HSCR podem apresentar mutações em outros genes. Mutações no gene RET são responsáveis por aproximadamente metade (~50%) dos casos familiares de HSCR e alguns casos esporádicos (~10-20%), sugerindo fortemente que a HSCR seja doença poligenica. Tem-se também sugerido que polimorfismos genéticos no RET podem influenciar o fenotipo da NEM2/HSCR. No presente estudo, analisamos o gene RET no sentido de investigar se o desenvolvimento de megacólon em pacientes com a mutação germinativa RET p.C620R estaria associado à presença de ou a) a uma segunda mutação germinativa ou b) a um SNP, ou c) a um haplótipo informativo, que possivelmente poderia estar potencialmente interagindo genicamente com a mutação RET principal e eventualmente modulando o fenótipo HSCR
Title in English
Analysis of the RET proto-oncogene in patients with medullary thyroid cancer and congenital mega-colon in a family with germline mutation p.C620R
Keywords in English
Aganglionosis
CMT PHEO HPT
Congenital megacólon
Hirschsprung
Multiple endocrine neoplasia type 2 (MEN2)
RET
Abstract in English
The multiple endocrine neoplasias (MENs) are inherited multi-tumoral conditions caused by germline mutations in specific genes. Specifically, the multiple endocrine neoplasia type 2 (NEM2) is a hereditary endocrine disorder transmitted dominantly and involving three main tumors, medullary thyroid carcinoma (CMT), primary hyperparathyroidism (HPT) and pheochromocytoma (PHEO). Despite the low prevalence of MEN2 in general population, the number of affected individuals per family can be significant as the penetrance of MEN2 is almost complete (~100%). In addition to CMT, PHEO and HPT, other conditions as congenital megacólon (Hirschsprung disease, HSCR or congenital intestinal aganglionosis) may occur in MEN2 (HSCR/MEN2). HSCR/MEN2 usually is due to RET mutations in codons 609, 618 and 620. HSCR has a wide phenotypic variation; is a complex multigenic disease; and has a low penetrance. Mutations in the RET gene are responsible for approximately 50% of the familial HSCR cases and ~10% of the sporadic HSCR cases, supporting that HSCR is a polygenic disease and this is confirmed by a few HSCR cases associated with mutations in the EDNRB and EDN3 genes. In the present study, we focused in the analysis of the RET gene in order to investigate whether the development of congenital megacólon in patients with RET mutation p.C620R is associated with the presence of, a) a second RET germline mutation, b) a SNP, or with a haplotype that co-segregate with the disease
 
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Publishing Date
2012-01-16
 
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