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Rastreio molecular do gene da peroxidase da tiróide em doentes com hipotiroidismo congénito

2004Master thesis Open access
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dc.contributor.authorRodrigues, Carina
dc.date.accessioned2011-06-13T15:21:55Z
dc.date.available2011-06-13T15:21:55Z
dc.date.issued2004
dc.description.abstractCongenital primary hypothyroidism (CH) affects about 1:3000 to 1:4000 infants and may be caused by defects in thyroidal ontogeny or hormone synthesis. In the past two decades, there were impressive advances in molecular genetics that lead to characterization of numerous genes that are essential for normal development and hormone production of the hypothalamic-pituitary-thyroid axis and for normal thyroid hormone synthesis. Mutations identified in these genes allowed the molecular caracterization of several sporadic and familial HC forms. Defects in the thyroid peroxidase (TPO) gene are reported to be one of the causes of congenital hypothyroidism (CH) due to thyroid hormone biosynthesis defect (thyroid dyshormonogenesis). The aim of the present study was to determine the nature and frequency of TPO gene mutations in patients with CH, characterized by elevated thyroid stimulating hormone (TSH) levels and orthopic thyroid gland, identified in the Portuguese National Neonatal Screening Programme. The sample comprised 55 patients, from 52 unrelated families, with follow-up in the endocrinology clinics of the treatment centres of Porto and Lisbon. Mutation screening in the TPO gene (exons 1-17) was performed by single-strand conformational analysis (SSCA) followed by sequencing of fragments with abnormal migration patterns. Eight different mutations were detected in 13 patients (7 homozygotes, 6 compound heterozygotes). Novel mutations included 3 missense mutations namely c.391T>C (p.S131P), c.1274A>G (p.N425S), c.2512T>A (p.C838S) as well as the predictable splice mutation c.2748G>A. The undocumented polymorphism c.180-47A>C, was also detected. The two most frequent mutations were c.1978C>G (p.Q660E) and c.1183_1186dupGGCC (p.R396fsX76). In order to establish the genetic background associated to these two most frequent mutations, haplotype analysis was done in patients and relatives using intragenic markers. The results suggested a common origin for each of these mutations. This is the first molecular study ever performed in Portuguese CH patients to establish the aetiology of CH due to a hormonogenic defect. The large proportion of patients found to have TPO mutations (approximately 24% of our sample) justifies the implementation of routine molecular testing.por
dc.identifier.citationRodrigues, Carina (2004). Rastreio molecular do gene da peroxidase da tiróide em doentes com hipotiroidismo congénito. Braga: Universidade do Minho. Tese de Mestrado em Genética Molecular.por
dc.identifier.urihttp://hdl.handle.net/10198/5147
dc.language.isoporpor
dc.peerreviewednopor
dc.relation.ispartofseriesId.: 4941021;
dc.subjectRastreio genéticopor
dc.titleRastreio molecular do gene da peroxidase da tiróide em doentes com hipotiroidismo congénitopor
dc.typemaster thesis
dspace.entity.typePublication
oaire.citation.conferencePlaceBragapor
oaire.citation.titleRastreio molecular do gene da peroxidase da tiróide em doentes com hipotiroidismo congénitopor
person.familyNameRodrigues
person.givenNameCarina
person.identifier.ciencia-idC415-C677-0253
person.identifier.orcid0000-0001-9773-1413
rcaap.rightsopenAccesspor
rcaap.typemasterThesispor
relation.isAuthorOfPublicationef666665-6593-48be-bc48-6a1bb58bedbd
relation.isAuthorOfPublication.latestForDiscoveryef666665-6593-48be-bc48-6a1bb58bedbd

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