dorsal closure, spreading of leading edge cells

Dorsally-directed movement of the cells at the leading edge of the epithelium over the amnioserosa.

Catalysis of the reaction: a long-chain aldehyde + CoA + NADP+ = a long-chain acyl-CoA + NADPH.

Closure of the dorsal hole. Filopodia extending from each leading edge interdigitate at the dorsal midline and appear to prime the formation of adherens junctions between the two rows of leading edge cells. Newly formed septate junctions are also used to seal the dorsal hole.

The process whose specific outcome is the progression of the ectoderm over time, from its formation to the mature structure. In animal embryos, the ectoderm is the outer germ layer of the embryo, formed during gastrulation.

The origin and formation of nervous tissue.

Catalysis of the reaction: (6Z,8E,10E,14Z)-(5S,12R)-5,12-dihydroxyicosa-6,8,10,14-tetraenoate + NADPH + H2O = (6Z,8E,10E,14Z)-(5S,12R)-5,12,20-trihydroxyicosa-6,8,10,14-tetraenoate + NADP+ + H2O.

Catalysis of the reaction: malonyl-CoA = acetyl-CoA + CO2.

Specification of the terminal regions (the two non-segmented ends) of the embryo by the gap genes; exemplified in insects by the actions of huckebein and tailless gene products.

The partitioning of an embryo into serially repeated regions, e.g. tagmata, segments or parasegments.

Catalysis of the reaction: 7-methylguanosine 5'-triphospho-5'-polynucleotide + H2O = 7-methylguanosine 5'-phosphate + polynucleotide.

Allocation of cells to parasegments in the embryo, through the action of overlapping series of pair rule gene activities.

Division of the 14 parasegments of the embryo into anterior and posterior compartments; exemplified by the actions of the segment polarity gene products.

The establishment of an organism's body plan or part of an organism with respect to the left and right halves. The pattern can either be symmetric, such that the halves are mirror images, or asymmetric where the pattern deviates from this symmetry.

A complex and coordinated series of cellular movements that occurs at the end of cleavage during embryonic development of most animals. The details of gastrulation vary from species to species, but usually result in the formation of the three primary germ layers, ectoderm, mesoderm and endoderm.