The effect of repressors on ion channel gene expression was studied. The hKv4. 3 promoter and the sequence （ ＋ 2-- ＋ 160, S160） of 5＇-UTR of the hKv4. 3 gene was cloned into the pβ-gal-Basic vector. The transient expression of the pβ-gal vector and the analysis of the relative activity of β-galactosidase were carried out. The analysis of the mRNA level was carried out with the RT-PCR method. S160 could intensively repress the expression of the hKv4. 3 gene with position-specificity. The level of mRNA did not alter obviously. A repressor（ S160）, in 5＇-UTR of the hKv4. 3 gene was found and its repression to gene expression may play a role in the post-transcription process.
LI HaoJIANG Chun-laiYU Xiang-huiWU Yong-geLI WeiKONG Wei
