WormMine: ExpressionPattern Expr20

• Pattern: Expression is seen from the L1 larval stage as neural processes (small nuclei in the pharynx) in the ventral and dorsal nerve cords. This expression appears to be cytoplasmic. Staining is evident in a few intestinal nuclei just anterior to the intestinal-rectal valve. A ring of stain is also present around the isthmus of the pharynx from L2 to L4. Staining is evident in small nuclei (possibly neuronal) of the pharynx, as a cytoplasmic smear down the dorso/ventral nerve cords, and in a few intestinal nuclei just anterior to the intestinal-rectal valve. A ring ofstain is also present around the isthmus of the pharynx from L2 to L4.
• Primary Identifier: Expr20
• Remark: Developmental expression pattern screen for genes predicted in the C.elegans genome sequencing project. Life_stage summary = post L1
• Subcellular Localization: Expression is a cytoplasmic smear down the dorso/ventral nerve cords.

4 Anatomy Terms

Definition	Name	Synonym	Primary Identifier
A chain of very large cuboidal cells forming a wide central lumen in which food arrives from the posterior pharynx, is digested, and from which waste products proceed to the rectum. Intestinal rings form in groups of two and four cells surrounding the common lumen; thus the epithelium is only one cell deep at any point, with neighboring cells firmly secured to their neighbors by apical adherens junctions. These cells have very large nuclei and many large vacuoles, yolk granules, and other inclusions; the latter increase in number and electron density as the animal ages.	intestine	gut	WBbt:0005772
a large process bundle that runs along the vental mid-line extending from the ventral region of the nerve ring.	ventral nerve cord	ventral cord	WBbt:0005829
a bundle of nerve processes that runs along the dorsal mid-line of the animal.	dorsal nerve cord	dorsal cord	WBbt:0006750
a section of pharynx of which muscles contract with a peristaltic motion.	isthmus		WBbt:0003734

1 Genes

WormBase Gene ID	Gene Name	Sequence Name	Organism
WBGene00014025	asna-1	ZK637.5	Caenorhabditis elegans

4 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 third stage larva. At 25 Centigrade, it ranges 32.5-40 hours after fertilization, 18.5-26 hours after hatch.		L3 larva Ce	WBls:0000035
	The second stage larva. At 25 Centigrade, it ranges 25.5-32.5 hours after fertilization, 11.5-18.5 hours after hatch.		L2 larva Ce	WBls:0000027
	The fourth stage larva. At 25 Centigrade, it ranges 40-49.5 hours after fertilization, 26-35.5 hours after hatch.		L4 larva Ce	WBls:0000038