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Lineage expression: P lineage. Lineage expression: T lineage. Lineage expression: V lineage. |
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Expr1894
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The pattern of gfp expression in hermaphrodites carrying the gfp reporter was dynamic but at all stages restricted to hypodermal cells. Early in the L1 stage, expression was seen in H0, H1, and H2, in the anterior V cells, and in the T cells. Weak expression was also seen in hypodermal nuclei in the head and the tail, including those in hyp5, hyp6, hyp8, hyp9, and hyp10. Expression was not seen at this stage, however, in the P cells or in nuclei in the hyp7 syncytium. After division of H1, both H1.a, a seam cell, and H1.p, which joins hyp7, expressed gfp. Likewise, after division of V1V4 both the anterior daughters (which join hyp7) and the posterior daughters (which remain seam cells) expressed gfp. This pattern was repeated at each of the larval molts with the result that in adult worms, all descendents of H1, H2, and V1V4 expressed gfp. At the end of the L1 stage, V5.p could be seen to express gfp but not V5.a, which is a neuroblast. In the P cell lineages, expression was first seen toward the end of the L1 stage in P1.p, P2.p, P9.p, P10.p, and P11.p nuclei. These cells fuse with hyp7 during the L1 stage. Expression of gfp was not seen, on the other hand, in the daughters of P3 to P8 or P12 (all of which remain separate from hyp7). By the end of the L1 stage most nuclei in hyp7 expressed gfp, as did those in hyp5, hyp6, hyp8, hyp9, hyp10, and hyp11. After division of P3.p, P4.p, and P8.p during the L3 stage, all six daughters started to express gfp concomitant with their fusion with hyp7. The daughters of P5.p, P6.p, and P7.p, the progenitors of the vulva, remained negative for gfp expression as did all the cells they subsequently gave rise to. In adult worms, no hypodermal nuclei that failed to express gfp could be identified. Conversely, no nonhypodermal nuclei were observed at any stage that expressed the gfp marker. |
nuclei |
