WormMine: ExpressionPattern Expr1639

• Pattern: Epidermal cells in C. elegans are born on the dorsal side of the embryo, and the epidermal sheet migrates ventrally to enclose other tissues and anteriorly to cover the head. slt-1::GFP was first detectable just as the migrating epidermal cells completely covered the head and was expressed in hyp4, hyp1, and other epidermal cells. At the 2-fold stage of embryogenesis, expression spread beyond the anterior cap of cells to other anteriorly located cells, including the most anterior head muscle cells and some anterior socket cells, a set of glia associated with head sensilla. During the second half of embryogenesis, when most cells and axons in the developing nervous system are migrating, slt-1::GFP expression was concentrated in anterior cells and excluded from the middle of the body. Expression in anterior cells, including the anterior hyp cells, continued throughout larval stages and in the adult. Around the two-fold stage of embryogenesis, slt-1::GFP expression became evident in pharyngeal cells, including the most posterior pharyngeal muscle. Expression in the pharynx persisted through the L1 stage and in the adult. Beginning at the 2-fold stage of embryogenesis, slt-1::GFP was expressed in dorsal body wall muscles in a striking asymmetric pattern. Dorsal muscle expression began in the posterior embryo and spread anteriorly by the L1 larval stage, all dorsal muscles expressed slt-1::GFP. Robust expression in dorsal muscles persisted throughout the life of the animal. slt-1::GFP was also expressed in ventral body wall muscles, beginning in the L1 stage in posterior ventral muscles and continuing to more anterior muscles in later larval stages. Throughout development, dorsal muscles expressed more slt-1::GFP than ventral muscles. slt-1::GFP was expressed in the BDU neuron in the body and the RIH and RMED neurons, which have the most anterior axons in the nerve ring. Expression was first detected in comma stage embryos, with expression restricted to a cap of anterior cells. slt-1::GFP is not expressed in ventral epidermal cells. slt-1::GFP was expressed in the anal sphincter muscle.
• Primary Identifier: Expr1639
• Remark: Double staining with antisera against GFP and the epithelial junction protein JAM-1 (MH27) was performed to characterize embryonic expression in more detail.

13 Anatomy Terms

Definition	Name	Synonym	Primary Identifier
An interfacial epithelial cell which forms a distal cap on a sheath cell to bind the sheath of a sensillum to the neighboring hypodermis, via adherens junctions. There is often a narrow opening through the socket from the exterior into the sheath channel, allowing ciliated dendrites to be exposed to the external environment. The socket cell functions similarly to a glial cell.	socket cell		WBbt:0005750
Longitudinal bands of muscle cells surrounding animal body, with one band running in each quadrant of the body, regulated contraction and relaxation of these muscles cause locomotion.	body wall musculature	body muscle	WBbt:0005813
a saddle-shaped muscle cell that encircles the intestinal-rectal valve	anal sphincter muscle	lineage name: ABprpppppap	WBbt:0005798
Cylindrical hypodermal syncytium in head	hyp3	lineage name: ABplaapaaaa	WBbt:0004690
Cylindrical hypodermal syncytium in head	hyp4	lineage name: ABarpapapa	WBbt:0004687
Cylindrical hypodermal syncytium in head	hyp1	lineage name: ABalpaapppa	WBbt:0004694
Cylindrical hypodermal syncytium in head	hyp2	lineage name: ABalpaapppp	WBbt:0004692
Cylindrical hypodermal syncytium in head	hyp5	lineage name: ABarpappap	WBbt:0004685
Neuron, process runs along excretory canal and into ring, unique darkly staining synaptic vesicles	BDUL	lineage name: ABarppaappp	WBbt:0003812
Neuron, process runs along excretory canal and into ring, unique darkly staining synaptic vesicles	BDUR	lineage name: ABarpppappp	WBbt:0003811
Cylindrical hypodermal syncytium in head	hyp6	lineage name: ABarpaapaa	WBbt:0004679
Ring motor neuron	RMED	lineage name: ABalapppaap	WBbt:0005027
Neuron class of one ring interneuron.	RIH	lineage name: ABprpappaaa	WBbt:0003928

1 Genes

WormBase Gene ID	Gene Name	Sequence Name	Organism
WBGene00004854	slt-1	F40E10.4	Caenorhabditis elegans

7 Life Stages

Remark	Definition	Other Name	Public Name	Primary Identifier
	The stage that begins when a C.elegans individual is fully-developed and has reached maturity.		adult Ce	WBls:0000041
	The C. elegans life stage spanning 620-800min(hatch) after first cleavage at 20 Centigrade. Cell number remains at ~560 cells, with some new cells generated and some cells go through programmed cell death. A stage after elongation is over. The last stage of embryogenesis. Also called pre-hatched embryo, late embryo or morphogenetic embryo.		fully-elongated embryo Ce	WBls:0000021
	A developmental life stage of the nematode Caenorhabditis elegans that occurs from egg hatching until adulthood.		larva Ce	WBls:0000023
	The C. elegans life stage spanning 520-620min after first cleavage at 20 Centigrade. Cell number remains at ~560 cells, with some new cells generated and some cells go through programmed cell death. The shape of embryo is elongated and tripple fold. A stage between 2-fold embryo and fully-elongated embryo. Also called pretzel embryo or pretzel stage.		3-fold embryo Ce	WBls:0000020
	The C. elegans life stage spanning 420-460min after first cleavage at 20 Centigrade. Cell number remains at ~560 cells, with some new cells generated and some cells go through programmed cell death. The shape of embryo is elongated and fold back 50%. A stage between comma embryo and 2-fold embryo.		1.5-fold embryo Ce	WBls:0000018
	The C. elegans life stage spanning 390-420min after first cleavage at 20 Centigrade. Cell number remains at ~560 cells, with some new cells generated and some cells go through programmed cell death. The shape of embryo looks like a comma. A stage between bean embryo and 1.5-fold embryo.		comma embryo Ce	WBls:0000017
	The C. elegans life stage spanning 460-520min after first cleavage at 20 Centigrade. Cell number remains at ~560 cells, with some new cells generated and some cells go through programmed cell death. The shape of embryo is elongated and double fold. A stage between 1.5-fold embryo and 3-fold embryo.		2-fold embryo Ce	WBls:0000019