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Volume 271, Number 24,
Issue of June 14, 1996
pp. 14567-14571
©1996 by The American Society for Biochemistry and Molecular Biology, Inc.
Molecular Cloning of a Novel Thyroid Hormone-responsive Gene,
ZAKI-4, in Human Skin Fibroblasts
(Received for publication, August 22, 1995, and in revised form, March 19, 1996)
Takashi
Miyazaki
§
,
Yasuhiko
Kanou
¶
,
Yoshiharu
Murata
,
Sachiko
Ohmori
,
Toshimitsu
Niwa
§
,
Kenji
Maeda
§
,
Hideki
Yamamura
¶
and
Hisao
Seo
From the Department of Endocrinology and Metabolism
and the ¶ Department of Teratology and Genetics, Division of
Molecular and Cellular Adaptation, Research Institute of Environmental
Medicine, Nagoya University, Nagoya 464-01, Japan and the
§ Department of Internal Medicine, Nagoya University Branch
Hospital, Nagoya 461, Japan
Utilizing a method called ``differential display
of mRNAs by means of polymerase chain reaction'', the cDNA
fragment of a thyroid hormone-responsive gene ZAKI-4 was
cloned from cultured human skin fibroblasts. Northern blot analysis
revealed that there were two ZAKI-4 mRNA species (3.4 and 1.4 kilobases (kb)), and they were up-regulated by a physiological
concentration of triiodothyronine (T3). This T3
effect was abolished by the treatment with cycloheximide, indicating
the possibility that gene ZAKI-4 is regulated by
T3 in an indirect fashion, through an intermediate product
of T3, rather directly by T3 itself. No effect
of T3 on ZAKI-4 mRNA stability suggested that
T3 induces the mRNA at the transcriptional level. Rapid
amplification of cDNA ends confirmed the presence of two mRNA
species. ZAKI-4 mRNA was detected in heart, brain,
liver, and skeletal muscle but not in placenta, lung, kidney and
pancreas. In skin fibroblasts and skeletal muscle, 3.4-kb mRNA was
the major species, whereas 1.4-kb mRNA was dominant in heart,
brain, and liver. The sequence analysis suggested that the two mRNA
species arise from alternative polyadenylation and code a single
protein of 192 amino acids. No homologous protein sequence was found in
a data base. Elucidation of the function of ZAKI-4 gene
product will provide new insights into an important role of
T3 in various organs.

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Copyright © 1996 by the American Society for Biochemistry and Molecular Biology.
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