Figure 4. Dauer formation in
daf-2(
e1370) mutant animals is associated with an increase in autophagy in lateral hypodermal seam cells. (A) GFP::LGG-1 expression in the seam cells of wild-type N2 and
daf-2(
e1370) L3 larvae grown at 15C and 25C. The arrow shows representative GFP-positive punctate areas that label preautophagosomal and autophagosomal structures. (B) Quantitation of GFP::LGG-1-positive punctate areas in the seam cells of wild-type N2 and
daf-2(
e1370) animals grown at 15C and 25C (mean + SEM for at least 50 seam cells from 10 different animals). (C to I) Representative electron micrographs of lateral hypodermal seam cells in a wild-type N2 control animal in (C) the L2 larval stage and (D) the L3 larval stage; a
daf-2(
e1370) animal grown for (E) 1 day at 25C and [(F) to (H)] 2 days at 25C; and (I) a
daf-2(
e1370);
bec-1 (RNAi) animal grown for 2 days at 25C. In (F), arrowheads denote representative vacuolar structures in the late stages of the autophagolysosomal pathway; the white arrowhead denotes structure that is shown at higher magnification in (H); the arrow denotes the dauer cuticle. (G) A representative early autophagosome and (H) a multilamellar body/autolysosome are shown in a seam cell of a
daf-2(
e1370) dauer animal. Scale bars, 1 uM [(C) to (F) and (I)]; 0.1 uM [(G) and (H)].