Fourteen T4-binding globulin (TBG) variants have been identified at the gene level. They are all located in the coding region of the gene and 6 produce complete deficiency of TBG (TBG-CD). We now describe the first mutation in a noncoding region producing TBG-CD. The proband was treated for over 20 yr with L-T4 because of fatigue associated with a low concentration of serum total T4. Fifteen fa...

Thyroxine-binding globulin (TBG) synthesis by human hepatoma (Hep G2) cells was demonstrated by pulse labeling with [35S]methionine or [3H]mannose and subsequent immunoprecipitation in the medium or cell lysate. Secreted TBG was glycosylated and had the same apparent molecular weight in sodium dodecyl sulfate-polyacrylamide gel electrophoresis as TBG purified from human serum. Pulse-chase exper...

Trypanosoma brucei rhodesiense (Tbr) and T. b. gambiense (Tbg), causative agents of Human African Trypanosomiasis (sleeping sickness) in Africa, have evolved alternative mechanisms of resisting the activity of trypanosome lytic factors (TLFs), components of innate immunity in human serum that protect against infection by other African trypanosomes. In Tbr, lytic activity is suppressed by the Tb...

A method for obtaining highly purified thyroxine-binding globulin (TBG) from whole human serum is presented. The method employs relatively simple procedures of step-wise ammonium sulfate precipitation followed by column chromatography on DEAE cellulose and DEAE Sephadex. The final product produces a single protein band on disc electrophoresis. The sedimentation constant of the TBG thus purified...

The thyroid hormone/thyroxin-binding globulin (TBG) ratio and the free thyroid hormone index (FTI) were compared in 372 subjects classified according to age, sex, and biochemical and clinical findings. Age-related variations in thyroid function tests were investigated, as was the relationship between triiodothyronine uptake and TBG. Men, but not women, showed significant age-dependent changes i...

Analog assays for free thyroxin (FT4) produce inaccurate results because the T4 analog is sequestered by albumin. Diagnostic Products Corp. (DPC) introduced the concept of chemically blocking analog-albumin binding in 1982. While DPC succeeded in eliminating albumin dependence, their 1985 version of chemically blocked FT4 assay appeared to be "thyroxin-binding globulin" (TBG) dependent, produci...

This study aims to identify hepatic genes affecting traits related to muscularity and obesity by combining expression analyses, association studies, and gene mapping. Functional candidate genes with trait-associated expression were obtained by hybridising custom made application-specific cDNA microarrays with targets of discordant sib pairs of a porcine experimental population. Out of 238 genes...

Inherited abnormalities of thyroid hormone-binding proteins are not uncommon and can predominate in some ethnic groups. They alter the amount of iodothyronines present in serum and, although the concentration of free hormones remains unaltered, routine measurement can give erroneous results. With a single exception, inherited defects in thyroxine-binding globulin (TBG), are X-chromosome linked ...

Using the simple method of protein analysis described here, we could identify thyroxin (T4)-binding-protein abnormalities in euthyroid patients with hyperthyroxinemia or hypothyroxinemia. Serum incubated with [125I]thyroxin was analyzed by agarose gel electrophoresis, with bromphenol blue staining of protein. The relative distribution of radioactive T4 was determined for each binding protein--t...

Serum from normal, pregnant, and severely ill patientswas stripped of endogenousthyroidhormonesand diluted1100fold in barbital buffer. We then used it to study the binding characteristicsof thyroxin binding globulin (TBG), noting significant differences in binding capacities among the groups. The mean (± SD) trilodothyronine/thyroxinratio for bindingcapacity was 18 ±4 for normal subjects.The ra...