Abstract:Congenital hypothyroidism and the thyroid hormone (T3) resistance syndrome are associated with severe central nervous system (CNS) dysfunction. Because thyroid hormones are thought to act principally by binding to their nuclear receptors (TRs), it is unexplained why TR knock-out animals are reported to have normal CNS structure and function. To investigate this discrepancy further, a T3 binding mutation was introduced into the mouse TR-␤ locus by homologous recombination. Because of this T3 binding defect, the… Show more
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