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Central Laboratory for Clinical Investigation, Osaka University Hospital, 2–15 Yamadaoka, Suita, Osaka 565-0871, Japan
¹ Department of Laboratory Medicine, Osaka University Medical School, 2-2 Yamadaoka, Suita, Osaka 565-0871, Japan
² Kuma Hospital, Simoyamate-Dori, Chuo-Ku, Kobe, Hyogo 650-0011, Japan

(Requests for offprints should be addressed to I Maeda; Email: maeda{at}hp-lab.med.osaka-u.ac.jp)

Thyroid-specific genes, such as thyroid peroxidase, thyroglobulin, Na⁺/I^– symporter and thyroid-stimulating hormone receptor, play fundamental roles in thyroid function and relate to many pathological conditions. Using sequence specific-differential display, we detected three genes that showed higher expression levels in normal thyroid tissues than in thyroid tumor tissues. After subcloning and sequencing analysis, one of the genes was revealed to be tensin3. The expression level of tensin3 was examined with real-time quantitative PCR analysis. Its expression levels were more depressed in thyroid tumor tissues than in normal thyroid tissues. The decrease was even more evident in two anaplastic carcinomas. High and moderate levels of tensin3 mRNA expression were observed in the thyroid and placenta respectively. Tensin3 mRNA was expressed only in low levels in other tissues, such as the brain, heart, lung, liver, pancreas, kidney, skeletal muscle, white blood cells and prostate. These results show that tensin3 is a novel thyroid-specific gene and further investigations may reveal its relation to thyroid function or thyroid disease.