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Partial thyroxine-binding globulin deficiency in a family with coding region mutations in the TBG gene.
Chen, L-D; Lu, H-J; Gan, Y-L; Pang, S-W; Zheng, Q; Ye, D-M; Huang, X-Y; Qi, H-N; Xu, W-B; Wen, X-Z; Li, L-H; Li, L.
Afiliação
  • Chen LD; Department of Laboratory Medicine, General Hospital of Southern Theater Command of PLA, Guangzhou, 510010, Guangdong, China.
  • Lu HJ; Department of Medical Genetics, School of Basic Medical Sciences, Southern Medical University, Shatai Road 1023, Guangzhou, 510515, Guangdong, China.
  • Gan YL; Department of Laboratory Medicine, General Hospital of Southern Theater Command of PLA, Guangzhou, 510010, Guangdong, China.
  • Pang SW; Zhengzhou Yihe Hospital, Zhengzhou, 450000, Henan, China.
  • Zheng Q; Department of Medical Genetics, School of Basic Medical Sciences, Southern Medical University, Shatai Road 1023, Guangzhou, 510515, Guangdong, China.
  • Ye DM; Department of Medical Genetics, School of Basic Medical Sciences, Southern Medical University, Shatai Road 1023, Guangzhou, 510515, Guangdong, China.
  • Huang XY; Department of Laboratory Medicine, General Hospital of Southern Theater Command of PLA, Guangzhou, 510010, Guangdong, China.
  • Qi HN; Department of Medical Genetics, School of Basic Medical Sciences, Southern Medical University, Shatai Road 1023, Guangzhou, 510515, Guangdong, China.
  • Xu WB; Department of Medical Genetics, School of Basic Medical Sciences, Southern Medical University, Shatai Road 1023, Guangzhou, 510515, Guangdong, China.
  • Wen XZ; Department of Medical Genetics, School of Basic Medical Sciences, Southern Medical University, Shatai Road 1023, Guangzhou, 510515, Guangdong, China.
  • Li LH; Department of Laboratory Medicine, General Hospital of Southern Theater Command of PLA, Guangzhou, 510010, Guangdong, China. mature303@126.com.
  • Li L; Department of Medical Genetics, School of Basic Medical Sciences, Southern Medical University, Shatai Road 1023, Guangzhou, 510515, Guangdong, China. liliang@smu.edu.cn.
J Endocrinol Invest ; 43(12): 1703-1710, 2020 Dec.
Article em En | MEDLINE | ID: mdl-32266677
ABSTRACT

PURPOSE:

T4-binding globulin (TBG) is the main thyroid hormone (TH) transporter present in human serum. Inherited thyroxine-binding globulin (TBG) deficiency is caused by mutations in the TBG (SERPINA7) gene, which is located on the X chromosome. This study was performed to report and evaluate coding region mutations in TBG gene for partial thyroxine-binding globulin deficiency.

METHODS:

A pedigree spanning four generations is described in this study. The proband is a female with partial TBG deficiency. All members of this pedigree underwent thyroid function tests, while Sanger sequencing was used to identify the TBG gene mutations. Bioinformatics databases were used to evaluate the deleterious effects of the mutation(s). Two hundred and seven unrelated individuals were used to evaluate the thyroid function of individuals with different TBG mutations. A one-way ANOVA was used to analyze the impact of the TBG mutations on thyroid function.

RESULTS:

TBG gene sequencing results revealed that the proband had a novel mutation in codon 27 leading to alanine to valine substitution (p.A27V). This mutation was associated with lower serum T4 levels (p < 0.0001) when compared to the groups that did not carry the mutation. The previously reported p.L283F mutation was also found in the proband. The hemizygous p.L283F individuals presenting with lower T4 serum and TBG levels (p < 0.001) when compared to wildtype males and females. Both mutations were deleterious upon SIFT and PolyPhen-2 evaluation.

CONCLUSION:

Associated with partial thyroxine-binding globulin deficiency, this study reports a novel p.A27V mutation in the TBG gene.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Aborto Habitual / Doenças Genéticas Ligadas ao Cromossomo X / Globulina de Ligação a Tiroxina Tipo de estudo: Prognostic_studies Limite: Adult / Female / Humans / Pregnancy País/Região como assunto: Asia Idioma: En Revista: J Endocrinol Invest Ano de publicação: 2020 Tipo de documento: Article País de afiliação: China

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Aborto Habitual / Doenças Genéticas Ligadas ao Cromossomo X / Globulina de Ligação a Tiroxina Tipo de estudo: Prognostic_studies Limite: Adult / Female / Humans / Pregnancy País/Região como assunto: Asia Idioma: En Revista: J Endocrinol Invest Ano de publicação: 2020 Tipo de documento: Article País de afiliação: China