Modeling Biological Pattern Formation in Embryology

asurvey of progress and problems in comparative molecular embryology

This report surveys data and interpretations presented by speakers in the Arthropod Session of the 1994 BSDB Spring Symposium. After a short review of phylogenetical aspects in premolecular insect embryology, the following topics are discussed: the ancestral germ type of pterygote insects, correlations between oogenesis and embryonic pattern formation, the universality or otherwise of bicoid as...

O-21: Differential Expression and Epigenetic Pattern of HOX Family Genes in Cumulus Cells of Mature MII Oocytes from Patients with Polycystic Ovary Syndrome

Background Ovarian tissue cryopreservation represents a promising strategy to preserve the ovarian function in cancer patients. It is usually performed by slow freezing/rapid thawing (SF/RT). Recent studies emphasize an ultrarapid cryopreservation procedure, vitrification/warming (V/W), since it might prevent damages due to ice crystal formation. Comparative studies between the cryopreservation...

Evidence for specific feedback signals underlying pattern control during vertebrate embryogenesis.

Experiments are described in which sectors including dorsolateral mesoderm from early-neurula-stage amphibian embryos are grafted to the mid-ventral region of gastrula-stage hosts. The grafted tissue pursues an autonomous developmental sequence, though integrated into the host mesodermal mantle, so that such embryos develop a ventral strip of ectopic somite tissue, occasionally with a pronephri...

The role of irradiated tissue during pattern formation in the regenerating limb.

The amphibian limb regeneration blastema is used here to examine whether irradiated, non-dividing tissue can participate in the development of new pattern of morphogenesis. Irradiated blastemas were rotated 180 degrees on normal stumps and normal blastemas rotated on irradiated stumps. In both cases supernumerary elements developed from the unirradiated tissue. The supernumeraries were defectiv...

Ultrastructural changes during transition of larval to adult intersegmental muscle at metamorphosis in the blowfly Calliphora erythrocephala. II. The formation of adult muscle.