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Correspondence

Deletion of Thyroid Transcription Factor-1 Gene in an Infant with Neonatal Thyroid Dysfunction and Respiratory Failure

N Engl J Med 1998; 338:1317-1318April 30, 1998

Article

To the Editor:

The thyroid and lungs develop as outgrowths of the ventral foregut. Differentiation and early function of both organs appear to be related through the common expression of the thyroid transcription factor-1 (TTF-1) gene on chromosome 14q13. In embryos, the pattern of expression of this gene is largely restricted to the epithelium of the developing thyroid and airways and the ventral forebrain.1 Experimental evidence suggests that TTF-1 mediates thyroid-specific gene transcription and pulmonary production of surfactant proteins.2,3 We identified a heterozygous deletion of the TTF-1 gene in a newborn infant with thyroid dysfunction and respiratory failure.

The infant was referred 15 hours after birth at term (weight, 3.4 kg; length, 48 cm; head circumference, 36 cm) because of severe respiratory distress and required ventilation therapy for one week. On admission, her serum thyrotropin concentration was high (60 mU per liter) and the serum thyroxine concentration was normal (8.9 μg per deciliter [114 nmol per liter]). On day 19, the serum thyrotropin concentration was still high (48 mU per liter) and the serum thyroxine concentration was normal (13.9 μg per deciliter [179 nmol per liter]). Technetium scanning revealed a normal-sized thyroid gland, but the uptake of technetium was low. Therapy with thyroxine was initiated. At the age of three months, withdrawal of thyroxine was followed by a rise in the serum thyrotropin concentration to 24 mU per liter within one month, and thyroxine therapy was resumed. The course during infancy was complicated by lower-airway infections with atelectasis of the right upper lobe. The morphology of the bronchial tree was normal, as judged by bronchoscopy. At the age of 2 years, mental and motor development were delayed by 4 and 12 months, respectively, and there was hypotonia and truncal ataxia. Magnetic resonance imaging of the brain revealed no abnormalities.

High-resolution G-banding showed a deletion of chromosome 14q13–21 that had arisen spontaneously. Fine mapping with a panel of polymorphic microsatellite markers identified a deleted region of less than 13 cM on the paternal chromosome, flanked by markers D14S1049 and D14S984, showing a biparental pattern of inheritance. For markers D14S75, D14S288, and D14S1014, only the maternal allele was inherited. Fluorescence in situ hybridization with cosmid probes from TTF-1 (gift of Dr. J.A. Whitsett, Cincinnati) and PAX9 genes (gift of Dr. M. Busslinger, Vienna, Austria) yielded signals only on maternal chromosome 14 (Figure 1Figure 1Genetic Studies in an Infant with Neonatal Thyroid Dysfunction and Respiratory Failure.).

This child presented with a unique combination of unexplained neonatal respiratory failure and a high serum thyrotropin concentration without overt hypothyroidism. TTF-1 has been proposed to have a dual role in both the morphogenesis and function of the thyroid and lung.1-3 Accordingly, TTF-1 haploinsufficiency is compatible with the occurrence of thyroid dyshormonogenesis and with reduced surfactant production and neonatal respiratory distress. Outside the thyroid gland and lungs, the expression of the TTF-1 gene appears to be confined to the diencephalic structures within the developing brain.1 Haploinsufficiency for the TTF-1 gene may have contributed to the developmental delay in this child, but other genes in the deleted region may be involved. There was also a heterozygous deletion of the PAX9 gene; this gene is thought to participate in the morphogenesis of the vertebral column, limbs, and pharyngeal-pouch derivatives.4 No clinical correlate was apparent in the infant.

Koenraad Devriendt, M.D., Ph.D.
Christine Vanhole, M.D.
Gert Matthijs, Ph.D.
Francis de Zegher, M.D., Ph.D.
University of Leuven, 3000 Leuven, Belgium

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