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Expr15649
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Expr15558
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Expr15567
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Expr15571
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Expr15572
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Expr15573
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Expr15579
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Expr15586
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Expr15651
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Expr15652
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Expr15589
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Expr15591
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Expr15598
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Expr15604
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Expr14590
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Embryonic expression of exc-7 was first observed at the bean stage. By reverse lineaging with use of SIMI-Biocell software, we confirm the identity of one of the expressing cells at this stage as the excretory canal cell. In L1 animals, broad expression in the head, ventral nerve cord (VNC), and tail was observed. In young adults, expression is notably observed in vulva cells. In the nervous system specifically, expression is observed in many neurons throughout the body, but unlike Drosophila Elav, exc-7::gfp it is not panneuronally expressed. We confirmed previously reported expression in cholinergic VNC MNs, but absence of GABAergic VNC MNs, consistent with previous reports (Fujita et al., 1999; Loria et al., 2003) and consistent with exc-7 functioning in cholinergic, but not GABAergic neurons to control alternative splicing (Norris et al., 2014). exc-7::gfp is also expressed in some non-neuronal cell types, including muscle and hypodermis, but not in the gut. A previous report showed that exc-7 is only transiently and weakly expressed in the excretory cell, which, based on exc-7's excretory mutant phenotype, has puzzled researchers (Fujita et al., 2003). We find that the gfp tagged exc-7 locus is strongly and continuously expressed in the excretory canal cell. |
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Expr15608
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Expr15611
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4.2 k |
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Expr15345
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4.2-1k |
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Expr15346
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Picture: Fig. 5. ant-1.3 = K01H12.2 |
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Expr8110
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The fusion protein ANT-1.3::GFP produces a GFP signal that was observed in the intestine and the anterior part of elongated embryos without any appreciable change during embryonic development. However, the GFP signal was observed during larval development and in adults in a few additional cells: a pair of head neurons that send ciliary process to the anterior tip of the animal and one ventral neuron, which has been tentatively identified as VA11. |
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Expr15570
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Expr1872
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In late L2 larvae anti-PAG-3 staining was seen in approximately two dozen cells in the head, all six mechanosensory neurons, the BDU neurons, approximately ten cells in the tail as well as in the ventral cord. PAG-3 staining of many cells in the head and tail remained detectable in adult animals. In the ventral cord, PAG-3 was first detected in the Pn.aa neuroblasts. PAG-3 was not detected in the Pn.ap euroblasts or their descendants. PAG-3 was present equally in each of the descendant cells of Pn.aa after subsequent rounds of division (i.e. the Pn.aaa, Pn.aap, Pn.aaaa and Pn.aaap cells), including the three differentiating neurons generated by each Pn.aa neuroblast. In most cells, PAG-3 protein became undetectable shortly after the cells had been generated in the L1, but PAG-3 was present in six cells in the ventral cords of adults. In late L2 larvae anti-PAG-3 staining was seen in approximately two dozen cells in the head, all six mechanosensory neurons, the BDU neurons, approximately ten cells in the tail as well as in the ventral cord. PAG-3 staining of many cells in the head and tail remained detectable in adult animals. In the ventral cord, PAG-3 was first detected in the Pn.aa neuroblasts. PAG-3 was not detected in the Pn.ap neuroblasts or their descendants. PAG-3 was present equally in each of the descendant cells of Pn.aa after subsequent rounds of division (i.e. the Pn.aaa, Pn.aap, Pn.aaaa and Pn.aaap cells), including the three differentiating neurons generated by each Pn.aa neuroblast. In most cells, PAG-3 protein became undetectable shortly after the cells had been generated in the L1, but PAG-3 was present in six cells in the ventral cords of adults. PAG-3 expression persisted throughout the life of the animal in four cells in the retrovesicular ganglion at the anterior end of the ventral cord and in two cells in the posterior ventral cord. In newly hatched L1-stage larvae, before the initiation of the postembryonic W and P cell lineages, two cells in the retrovesicular ganglion expressed PAG-3. Based on position, these cells were most likely the RIG interneurons. After completion of the W and P cell lineages, two additional cells in the retrovesicular ganglion and two cells in the posterior ventral cord contained detectable PAG-3 protein. These nuclei might be the two AVF and the VA11 and VA12 neurons, respectively. This hypothesis was confirmed by staining animals carrying an integrated Punc-4lacZ reporter, which is expressed in the AVF and VA as well as other neurons, with PAG-3 antiserum and monoclonal antibody against beta-galactosidase. PAG-3 protein was expressed more widely in the nervous system than had been observed using the Ppag-3lacZ reporter. PAG-3 was detected during embryonic development in many nuclei ~280 minutes after fertilization. |
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Transgenic Marker: rol-6(su1006). |
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Expr521
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Expression in touch-sensitive neurons, motor neurons, and interneurons which starts in the 2-fold embryo and disappears by L3. Sporadic expression seen in retrovesicular ganglion at L1. Expressed in ALM, PLM and BDU cells at 2-fold embryo, L1 and L2. In AVM, PVM cells at L1 and L2. Expressed in ventral cord motor neurons VA2-VA12, VB1-VB11, AVF cells, and precursors at L1 and L2. |
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Expr15644
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Expr15646
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Expr12716
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Expr12717
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Expr1329
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UNC-42 expression was detected with a mouse antiserum in several cells as early as 260 minutes of embryogenesis and in neurons at high levels in the head by comma stage, the time when these neurons extend axons and establish connections. Expression in head neurons continues into adulthood. UNC-42 was strongly expressed in at least 20 pairs of neurons of the head, including the AVA, AVD and AVE interneurons, ASH sensory neurons, and RMD and SMB motor neurons. Other neurons that express high levels of UNC-42 include the AIN, AVH, AVJ, AVK, RIV, SAA and SIB interneurons. The same expression pattern in the head was detected in animals that carry a transgene that encodes an UNC-42 protein tagged at its C terminus with GFP(gmEx186). Antiserum to UNC-42 and the gmEx104 GFP reporter gene revealed low levels of unc-42 expression in hypodermis and additional neurons in the head. Transient expression of UNC-42 protein was also detected in the DD motor neurons at hatching and at low levels in postembryonic ventral cord motor neurons derived from P11. UNC-42 protein was not detected in descendants of P2-P10 or P12. In the tail, unc-42-gfp (gmEx104) is strongly expressed in PVT. |
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Expr15633
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Expr1590
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Early Expression by Ventral Epidermoblasts: Ventral epidermoblasts P1/2-P11/12 are the first cells to express UNC-6::HA during embryogenesis. Netrin becomes detectable in the cytoplasm of these twelve cells soon after their births (circa 230 min) and before they form into regular rows. This staining gradually decreases in intensity as the cells spread ventrally, forming two symmetrical rows. At the completion of neurulation, soon after these rows have come together along the ventral midline, cytoplasmic staining is no longer detectable. Expression by Larval Ventral Cord Motorneurons: Postembryonic motorneurons VA2 to VA12 and VB3 to VB11 express UNC-6::HA in the ventral nerve cord. Netrin becomes detectable in these cells soon after their births at the end of the first larval stage. This expression continues through the adult stage. After hatching, the C. elegans larva increases about 5-fold in both length and circumference before becoming an adult. Six axons (AVAL, AVAR, AVBL, AVBR, AVG, and PVQR) in the right longitudinal tract and one axon (PVQL) in the left tract provide a continuous source of UNC-6 in the ventral nerve cord. Near the end of the first larval stage, the twenty postembryonic motorneurons (VA2VA12, VB3VB11) provide a further source of UNC-6 in the right tract. These motorneurons could maintain and sharpen the proposed gradient of netrin in the basement membrane of the epidermis and skew its peak farther to the right of the ventral midline. Expression by Lateral Ring and Lumbar Ganglia Neurons: Paired neurons AVA, AVB, and PVQ express UNC-6::HA in the lateral and lumbar ganglia, respectively. Born circa 300 min, netrin does not become detectable in these cells until about 3-fold elongation. Netrin expression then continues through the larval and adult stages. After axogenesis begins, PVQ itself expresses UNC-6. Expression by Midline and Asymmetric Neurons in the Developing Nerve Cord: Positioned at the anterior and posterior ends of the developing ventral nerve cord, respectively, the midline neurons AVG and PVT express UNC-6::HA. Netrin becomes detectable in the PVT neuron soon after its birth (circa 290 min). At this time, PVT is positioned on the ventral midline of the body wall just anterior to the developing rectum. Netrin expression is transient; UNC-6::HA is no longer detectable in this cell by 3-fold elongation. By then, PVT has shifted to its mature position as the most anterior cell in the preanal ganglion. Born circa 290 min, AVG does not express UNC-6::HA until about 3-fold elongation. AVG is positioned on the ventral midline in the retrovesicular ganglion at this time. Netrin expression then continues through the larval and adult stages. Besides AVG, a second neuron in the retrovesicular ganglion, RIFL (born circa 410 min), also expresses UNC-6::HA from about 3-fold elongation through adult. Interestingly, no UNC-6::HA expression is ever observed in the bilateral homolog RIFR. Expression by Sheaths in the Developing Head: All six inner labial and both ventral cephalic sheaths express UNC-6::HA in the early neurula. Netrin becomes detectable in these cells soon after their births (circa 310 min). At this time, the inner labial sheaths are clustered together just anterior to the developing pharynx. As the head depression forms around comma stage, the cell bodies move anteriorly toward the sensillar rudiments, revealing processes trailing back to the developing nerve ring. The endfeet form a more-or-less complete path around the pharynx that anticipates the anterior margin of the nerve ring. UNC-6::HA is detectable along the entire cell body and process at this time. As the embryo elongates, the cell bodies initially stay near the sensillar rudiments at the tip of the head. Presently, as judged by UNC-6::HA staining, the processes no longer reach the developing nerve ring. By inference, they fail to stretch apace with the rapid elongation of the head. As the pharynx elongates, the cell bodies assume their mature positions, typically just anterior or posterior to the metacorpus. Netrin expression is transient; only weak staining of UNC-6::HA is detectable in these cells beyond 3-fold elongation. The sheath processes appear to provide a scaffold of netrin-labeled pathways that support and guide labial axons to the nerve ring. Moreover, their endfeet could form a ring-shaped substratum for axons within the ring itself. The cephalic sheaths are positioned dorsally and ventrally just anterior to the developing nerve ring. In the early neurula, these cells extend sheetlike processes that apparently anticipate the outer surface of the ring neuropil. At this time, UNC-6::HA is detectable throughout the cell body and processes of the ventral cephalic sheaths. Netrin expression is transient; UNC-6::HA is no longer detectable in these cells by 3-fold elongation. Finally, no UNC-6::HA expression is ever observed in the dorsal cephalic sheaths. Expression by a Midline Neuron in the Developing Pharynx: The midline neuron I5 expresses UNC-6::HA in the developing pharynx. Netrin becomes detectable in this cell soon after its birth (circa 280 min). Positioned on the ventral midline, I5 is the most posterior neuron in the pharynx at this time. Netrin expression is transient; UNC-6::HA is no longer detectable in the cell body after about 3-fold elongation, but staining in the axons persists somewhat longer. |
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