O. Vincent et Jm. Gancedo, EXPRESSION OF A YEAST GENE CAN BE BLOCKED BY INSERTION OF SHORT YEASTDNA FRAGMENTS BETWEEN A UAS AND THE TATA BOX, Current genetics, 27(4), 1995, pp. 387-389
We have constructed a plasmid, pOV10, which facilitates the introducti
on of putative upstream activating sequences (UAS) or upstream repress
ing sequences (URS) from yeast genes into plasmids containing CYC1-lac
Z fusions. We have observed that the insertion of yeast sequences from
155 to 195 bp between the UAS and the TATA box of a CYC1-lacZ fusion
gene can block beta-galactosidase expression. It is suggested that thi
s block is related to the formation of nucleosomes on the DNA.