Document Detail

Neonatal thyrotoxicosis and maternal infertility in thyroid hormone resistance due to a mutation in the TRbeta gene (M313T).
MedLine Citation:
PMID:  12201835     Owner:  NLM     Status:  MEDLINE    
We report two unusual cases of resistance to thyroid hormone (RTH) in one family. The first case, a male infant, had clinical features of thyrotoxicosis in the neonatal period. In the fourth week of life weight gain was poor despite a daily intake of standard infant formula almost double the infant's estimated requirements. At this time serum free T4 (fT4) was 60.7 pmol/l (Normal range [NR] 11-25 pmol/l) and TSH was inappropriately normal at 1.8 mU/l (NR 0.3-4.0 mU/l). The infant responded clinically and biochemically to propylthiouracil (PTU) at a dose of 10 mg/kg/day. Following 27 days of treatment serum fT4 was 22.6 pmol/l and TSH had risen to 24.9 mU/l. As the infant was thriving treatment was discontinued. The infant, now aged 6 months old, remains clinically euthyroid and developmentally normal off treatment. The infant's mother, from whom he had inherited a mutation of the thyroid receptor beta (TRbeta) gene (M313T), presented earlier with secondary infertility and clinical features of thyrotoxicosis. Treatment with PTU restored her fertility and she spontaneously conceived. In the subsequent pregnancy, clinical and biochemical features of RTH improved, and she gave birth to a small but healthy female infant. In the next pregnancy, resulting in the birth of the affected male infant, clinical and biochemical features of RTH worsened, and high doses of PTU were required to maintain a clinically euthyroid state. To our knowledge, these are the first case reports of RTH associated with added features of a hypermetabolic state in infancy and secondary infertility.
J C Blair; U Mohan; V F Larcher; O Rajanayagam; J M Burrin; L A Perry; A B Grossman; V K K Chatterjee; M O Savage
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Publication Detail:
Type:  Case Reports; Journal Article    
Journal Detail:
Title:  Clinical endocrinology     Volume:  57     ISSN:  0300-0664     ISO Abbreviation:  Clin. Endocrinol. (Oxf)     Publication Date:  2002 Sep 
Date Detail:
Created Date:  2002-08-30     Completed Date:  2002-10-16     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  0346653     Medline TA:  Clin Endocrinol (Oxf)     Country:  England    
Other Details:
Languages:  eng     Pagination:  405-9     Citation Subset:  IM    
Department of Endocrinology, St Barthoomew's and the Royal London School of Medicine and Dentistry, UK.
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MeSH Terms
Infant, Newborn
Infertility, Female / etiology,  genetics*
Receptors, Thyroid Hormone / genetics*
Thyroid Hormone Resistance Syndrome / complications,  genetics*
Thyrotoxicosis / genetics*
Reg. No./Substance:
0/Receptors, Thyroid Hormone

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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