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Expr1837
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Expression of eff-1p::gfp was silent through the first third of embryogenesis, first appearing about 230 min after first cleavage in a subset of epidermal precursor cells. Over the next 3 hr, these and additional fluorescent cells were observed to migrate over the ventral and dorsal surfaces of the embryo, and the majority of GFP-positive cells fused to form the hyp6 and hyp7 syncytia. As elongation progressed, GFP was also expressed in a pair of cells that fused to form the binucleate "tail spike" . After hatching, eff-1p::gfp expression persisted in large epidermal syncytia through adulthood. Mononucleated epidermal cells-including the seam cells and the VPCs-remained nonfluorescent until shortly before undergoing larval fusion events. More specifically, GFP was seen in (1) nonstem daughters of the seam cells shortly before they fused into hyp7; (2) vulval cells invaginating to form toroids during morphogenesis; and (3) the rays and fan of the adult male tail. Expression was also seen in nonepidermal organs known to contain syncytia, including the pharynx and uterus. Interestingly, a few cells that express eff-1p::gfp have never been observed to fuse, such as some ventral epidermal precursors in the embryo and several neurons. |
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Expr1886
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Expression of the smp-2::gfp transcriptional reporter is detected initially in twofold embryos, in one mononucleate pharyngeal muscle cell and in intestinal cells. In the L1 stage, GFP fluorescence is observed in one mononucleate pharyngeal muscle cell m6, in all intestinal cells, in the head epidermal cells, in a restricted number of body wall muscles, in inner labial sensory neurons, and tentatively in URAVL/R and URADL/R motorneurons. In L4 larvae and adults, GFP fluorescence is restricted to intestinal cells and pharyngeal muscle cell m6. During larval development of the male tail, GFP expression is observed only in the hook. In adult males, rays 8 and 9, and the tail bursa express smp-2::gfp. smp-2::gfp is not seen in hyp 9 or hyp 10. |
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240 minutes of development (author) = late cleavage stage embryo (curator) Lineage expression: Rn descandents. |
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Expr1034
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Except for an earlier onset of GFP expression from both evpPRII.67 and evpPRII.75, all reporters displayed very similar expression patterns. Embryonic GFP expression reported by evpPRII.14 is first visible at approximately 240 minutes of development and is ubiquitous, a pattern that persists until hatching. At the beginning of each larval stage, dividing seam cells express mab-20::GFP, as do both daughter cells in males and hermaphrodites. After the anterior daughter fuses with surrounding hyp7, mab-20::GFP expression is downregulated or shut off in the both daughters. Other hypodermal expression is not evident in males or hermaphrodites. Other cells that express mab-20::GFP in hermaphrodites include the hermaphrodite-specific neurons at the L4 stage, vulva cells A to F throughout development, the migrating distal tip cells during the L4 stage, and several unidentified neurons within the nerve ring and ventral nerve cord. Expression in males include cells in the posterior ganglia, the migrating male linker cell beginning at the L3 to L4 transition, and the same nerve ring and ventral nerve cord expression observed in hermaphrodites. About 35 hours after hatching, mid-L3 males express mab-20::GFP in the 9 R(n) cells that give rise to the ray precursor clusters. Interior neuronal ganglia also express lower levels of mab-20::GFP at this stage. At 38-40 hours, when ray papillae are just visible, the 9 R(n)s and their descendents express mab-20::GFP. However, the underlying neural ganglia express the same level of GFP as the ray precursors at this stage. This pattern of expression continues until adulthood. |
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Another transgenic line independently established with the same construct also showed the similar patterns of EGFP expression. |
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Expr1884
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EGFP expression was first observed at the lima bean stage in P and V epidermal cells and intestinal cells. In larvae, EGFP was expressed intensely in motoneurons in the ventral nerve cord and several neurons in the nerve ring and in the tail. The seam cells showed moderate EGFP expression throughout development. In hermaphrodites, vulval precursor cells and their descendants expressed EGFP intensely throughout development. In the male tail, R(n) cells and their descendants all expressed EGFP intensely. |
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Lineage expression: Rn descandents. |
[plx-1::gfp] transcriptional and translational fusion constructs. A plx-1 transcriptional gfp reporter was constructed by cloning the 2621 bp sequence immediately 5' to the initiation codon into the multiple cloning site of pPD95_77 to generate plasmid pPD95_77cplx. A plx-1(+) rescuing construct was assembled from multiple PCR fragments encompassing the entire coding sequence of Ce-PLX-1. The 3' portion of the construct comes from the cDNA yk535f1 and contains 739 bp of the 3'UTR. This plx-1(+) cDNA minigene was cloned downstream of the promoter sequence of the pPD95_77cplx transcriptional reporter to obtain the plasmid pZH127. The gfp coding sequence is out of frame in pZH127. The construct contains the full-length plx-1(+) minigene with 2621 bp of sequence immediately 5' to the initiation codon and 739 bp of the 3'UTR sequence. The GFP-encoding portion of pZH127 was put in frame with the PLX-1(+) sequence by fusing it after the PmlI site located four amino acids before the stop codon. For this, a SphI-KpnI fragment was deleted from pZH127, cut with PmlI and re-ligated in combination with a linker sequence into the SphI-KpnI cut pZH127 to obtain the new plx-1 translational reporter plasmid pZH157. |
Expr2917
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Expression of both reporters is observed in all body wall muscles, male sex specific muscles and in the lateral epidermis during post-embryonic development. At the third larval stage, male tail hypodermal expression begins in all dividing Rn.a and Rn.p cells although predominantly in R1.a and R1.p. The strongest expression of the transcriptional reporters is observed in the ray 1 cells. Expression of the transcriptional reporters in other rays is weak and eventually disappears. A similar effect is observed for the translational reporter, which expresses first and most highly on the ray 1 and ray 2 cells. Although the translational reporter is found on all rays at later stages of male tail development, this expression is weak relative to the earlier expression in precursors to rays 1 and 2. |
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Reporter gene fusion type not specified. |
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Expr1854
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Fluorescence was detected in the hypodermal cells as early as the comma stage and throughout all the larval stages in the body hypodermis with the exclusion of seam cells. At the late L3 to L4 stages when ray cell differentiation took place, no dpy-11 promoter driven GFP signal was detected in the ray precursor (Rn) cells. Neither was there any signal detected in cells of the Rn.a branch differentiating into future neuronal derivatives. GFP signal was observed only in the Rn.p cells after they were born. |
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