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Mutations of the thyroglobulin gene and its relevance to thyroid disorders.
Rubio, Ileana G S; Medeiros-Neto, Geraldo.
Afiliação
  • Rubio IG; Thyroid Study Unit (LIM-25), Division of Endocrinology, University of São Paulo Medical School, São Paulo, Brazil.
Curr Opin Endocrinol Diabetes Obes ; 16(5): 373-8, 2009 Oct.
Article em En | MEDLINE | ID: mdl-19633549
PURPOSE OF REVIEW: To perform an update review on thyroglobulin gene mutations associated with congenital hypothyroidism, thyroid cancer, and autoimmunity. RECENT FINDINGS: Forty-two thyroglobulin mutations have been identified in dyshormonogenetic congenital hypothyroidism. Clinical and laboratory criteria defining defective thyroglobulin synthesis are mostly related to thyroglobulin mutations, generally caused by intracellular thyroglobulin transport defects to the colloid rather than defects in thyroid hormones synthesis. Some mutated thyroglobulin may escape the rigorous chaperone control and reach the colloid, allowing a wide phenotypic spectrum that includes euthyroidism in an adequate iodine environment. In some patients, continuous levothyroxine treatment does not reduce elevated serum thyroid-stimulating hormone (TSH) levels that may lead to goiter development. Prenatally, inactive mutant thyroglobulin will not be able to synthesize thyroid hormones and may increase pituitary thyrotroph threshold for thyroid hormone feedback. Congenital goiter is a risk factor for thyroid cancer and some thyroglobulin variants may confer susceptibility to thyroid autoimmunity. SUMMARY: Advances in the understanding of thyroglobulin genetic defects and its severity should allow researchers to perform adequate molecular diagnosis, genetic counseling, and intrauterine treatment to prevent subtle deficits in central nervous system development. This knowledge should improve the understanding of physiological functions of the thyroid and influence of nutritional iodine.
Assuntos

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Tireoglobulina / Doenças da Glândula Tireoide / Mutação Tipo de estudo: Prognostic_studies / Risk_factors_studies Limite: Humans Idioma: En Revista: Curr Opin Endocrinol Diabetes Obes Assunto da revista: ENDOCRINOLOGIA / METABOLISMO Ano de publicação: 2009 Tipo de documento: Article País de afiliação: Brasil País de publicação: Reino Unido

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Tireoglobulina / Doenças da Glândula Tireoide / Mutação Tipo de estudo: Prognostic_studies / Risk_factors_studies Limite: Humans Idioma: En Revista: Curr Opin Endocrinol Diabetes Obes Assunto da revista: ENDOCRINOLOGIA / METABOLISMO Ano de publicação: 2009 Tipo de documento: Article País de afiliação: Brasil País de publicação: Reino Unido