Figure 4. The
pha-4 3'UTR Regulates
let-7-Dependent Downregulation of Intestinal
pha-4::gfp Expression. (A) Examples of LCS:
let-7 duplexes predicted for
pha-4. (B and D) A
pha-4::gfp::
pha-43'UTR transgene is highly expressed in the intestinal cells of early stage (L3) larvae but is only weakly visible in L4 and adult animals. (C) Strong intestinal expression persists in adult animals when the
pha-4 3'UTR of the transgene is replaced by the
unc-54 3'UTR. (E)
let-7(
n2853) mutant animals continue to express the
pha-4::gfp::
pha3'UTR transgene as adults. Images in (D) and (E) were taken for the same exposure time and processed identically.