Caron_2003_J.Clin.Endocrinol.Metab_88_3546

Reference

Title : Compound heterozygous mutations in the thyroglobulin gene (1143delC and 6725G-->A [R2223H]) resulting in fetal goitrous hypothyroidism - Caron_2003_J.Clin.Endocrinol.Metab_88_3546
Author(s) : Caron P , Moya CM , Malet D , Gutnisky VJ , Chabardes B , Rivolta CM , Targovnik HM
Ref : J Clinical Endocrinology Metab , 88 :3546 , 2003
Abstract :

In a 22-yr-old healthy woman, a fetal goiter was diagnosed coincidentally by ultrasound during the sixth month of gestation, and hypothyroidism was affirmed by a high TSH (336 mU/liter) concentration after cordocentesis. A second ultrasound examination at 27 wk gestation showed further enlargement of the goiter (34/21 mm). Two intraamniotic injections of 200 microg levothyroxine were performed during the seventh month of pregnancy. Ultrasound studies revealed a fetal goiter size of 30/18 mm during the eighth month of gestation. The woman delivered at term a female infant with an Apgar score of 10 at 1 and 5 min. Cord blood analysis indicated elevated TSH (284 mU/liter) and low free T(4) (5.5 pmol/liter) levels. The serum thyroglobulin (Tg) concentration was low (0.8 ng/ml), whereas ultrasound of the neonate indicated an enlarged thyroid gland (32/15/14 mm). During the second pregnancy, ultrasound examination revealed a goiter, and fetal hypothyroidism was also confirmed after umbilical vein blood sampling (TSH, 472 mU/liter). After two intraamniotic injections of 500 microg levothyroxine, the woman delivered a male infant at 37 wk of pregnancy. In cord blood the serum TSH concentration was 39 mU/liter, and the serum Tg level was low (0.7 ng/ml). The parents were nonconsanguineous. After birth of the two affected siblings, genomic DNA sequencing identified the presence of compound heterozygous mutations of the Tg gene: the paternal mutation consists of a cytosine deletion at nucleotide 1143 in exon 9 (1143delC), resulting in a frameshift that generates a stop codon at position 382, and the maternal mutation is a guanine to adenine substitution at position 6725 in exon 38, creating the R2223H missense mutation in the acetylcholinesterase homology domain of Tg. In conclusion, we report two siblings with congenital goiter and hypothyroidism caused by compound heterozygous mutations of the Tg gene.

PubMedSearch : Caron_2003_J.Clin.Endocrinol.Metab_88_3546
PubMedID: 12915634
Gene_locus related to this paper: human-TG
A [R2223H]) resulting in fetal goitrous hypothyroidism
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Citations formats

Caron P, Moya CM, Malet D, Gutnisky VJ, Chabardes B, Rivolta CM, Targovnik HM (2003)
Compound heterozygous mutations in the thyroglobulin gene (1143delC and 6725G-->A [R2223H]) resulting in fetal goitrous hypothyroidism
J Clinical Endocrinology Metab 88 :3546

Caron P, Moya CM, Malet D, Gutnisky VJ, Chabardes B, Rivolta CM, Targovnik HM (2003)
J Clinical Endocrinology Metab 88 :3546