tailieunhanh - Báo cáo khoa học: Evolutionary changes to transthyretin: developmentally regulated and tissue-specific gene expression

A survey of the expression of the transthyretin and thyroxine-binding glob-ulin genes in various species during development provides clues as to how the present thyroid hormone distribution network in extracellular compart-ments developed during vertebrate evolution. Albumin may be the ‘oldest’ component of the thyroid hormone distribution network as it is found in the plasma of all vertebrates investigated. | ỊFEBS Journal MINIREVIEW Evolutionary changes to transthyretin developmentally regulated and tissue-specific gene expression Kiyoshi Yamauchi and Akinori Ishihara Department of BiologicalScience Faculty of Science Shizuoka University Japan Keywords developmentalregulation thyroid hormone tissue specificity transcriptionalcontrol transthyretin Correspondence K. Yamauchi Department of Biological Science Faculty of Science Shizuoka University Shizuoka 422-8529 Japan Fax 81 54 238 0986 Tel 81 54 238 4777 E-mail sbkyama@ Received 2 February 2009 revised 21 June 2009 accepted 21 July 2009 doi A survey of the expression of the transthyretin and thyroxine-binding globulin genes in various species during development provides clues as to how the present thyroid hormone distribution network in extracellular compartments developed during vertebrate evolution. Albumin may be the oldest component of the thyroid hormone distribution network as it is found in the plasma of all vertebrates investigated. Subsequent to albumin transthyretin appeared as the second component in this network during the evolution of vertebrates. The strong expression of transthyretin genes in the liver coincides with the presence of recognition site s for liver-enriched transcription factors such as HNF-3P Foxa2 in the transthyretin promoter regions of vertebrates. Finally the addition of thyroxine-binding globulin to this network occurred at postnatal stages in some marsupials and rodents and in perinatal to adult stages in most eutherians. All vertebrates have defined developmental stages when thyroid hormone-dependent transition from larval to juvenile forms occurs. The inclusion of transthyretin and thyroxine-binding globulin in the thyroid hormone distribution network may be correlated with the increased requirement of thyroid hormones for thyroid hormone-dependent tissue remodeling during these stages and or increased metabolism in thyroid .

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