Subequatorial cytoplasm plays an important role in ectoderm patterning in the sea urchin embryo

Development, Growth & Differentiation
T KominamiHiromi Takata

Abstract

To gain information on the process of ectoderm patterning, the animal halves of sea urchin embryos were isolated at various stages, and their morphology was examined when control embryos developed into pluteus larvae. The animal halves separated at the 8-cell stage developed into 'dauerblastula', without showing any conspicuous ectoderm differentiation. In contrast, some of the animal halves isolated at the 60-cell stage (after the sixth cleavage) formed a ciliated band and oral opening, suggesting that some patterning signal was transmitted from the vegetal to animal hemisphere during early cleavage. Further patterning of the animal hemisphere did not seem to occur until hatching, since both the animal halves isolated at the 60-cell stage and hatching stage showed the same degree of ectoderm patterning. After hatching, the later animal halves were isolated, the more patterned ectoderm they formed. The animal halves isolated just prior to gastrulation differentiated well-patterned ectoderm. It is of note, however, that the level of separation was a more crucial factor than the timing of separation; even the animal fragments of newly hatched embryos differentiated well-patterned ectoderm if they had been separated at a subequato...Continue Reading

References

May 1, 1979·Experimental Cell Research·R M Showman, C A Foerder
Dec 1, 1971·Development, Growth & Differentiation·K Dan, M Ikeda
Jan 15, 1984·Journal of Molecular Biology·J J LeeE H Davidson
Aug 1, 1994·Developmental Biology·K M Malinda, C A Ettensohn
Feb 24, 1998·The Journal of Experimental Zoology·K Mitsunaga-NakatsuboH Shimada
Oct 23, 1998·Development, Growth & Differentiation·T Kominami, M Takaichi
Jan 25, 2000·Developmental Biology·L M Angerer, R C Angerer
Jan 9, 2001·The Biological Bulletin·T Kominami, H Takata
May 25, 2002·Zoological Science·Minoru Iijima, Shonan Amemiya
Jan 2, 2003·Current Topics in Developmental Biology·Lynne M Angerer, Robert C Angerer
Sep 6, 2005·Zoological Science·Haruko Kurihara, Shonan Amemiya

❮ Previous
Next ❯

Citations

Feb 25, 2009·Development, Growth & Differentiation·Hiroki Sasaki, Tetsuya Kominami
May 12, 2009·Biochimica Et Biophysica Acta·Yi-Hsien Su

❮ Previous
Next ❯

Related Concepts

Trending Feeds

COVID-19

Coronaviruses encompass a large family of viruses that cause the common cold as well as more serious diseases, such as the ongoing outbreak of coronavirus disease 2019 (COVID-19; formally known as 2019-nCoV). Coronaviruses can spread from animals to humans; symptoms include fever, cough, shortness of breath, and breathing difficulties; in more severe cases, infection can lead to death. This feed covers recent research on COVID-19.

Blastomycosis

Blastomycosis fungal infections spread through inhaling Blastomyces dermatitidis spores. Discover the latest research on blastomycosis fungal infections here.

Nuclear Pore Complex in ALS/FTD

Alterations in nucleocytoplasmic transport, controlled by the nuclear pore complex, may be involved in the pathomechanism underlying multiple neurodegenerative diseases including Amyotrophic Lateral Sclerosis and Frontotemporal Dementia. Here is the latest research on the nuclear pore complex in ALS and FTD.

Applications of Molecular Barcoding

The concept of molecular barcoding is that each original DNA or RNA molecule is attached to a unique sequence barcode. Sequence reads having different barcodes represent different original molecules, while sequence reads having the same barcode are results of PCR duplication from one original molecule. Discover the latest research on molecular barcoding here.

Chronic Fatigue Syndrome

Chronic fatigue syndrome is a disease characterized by unexplained disabling fatigue; the pathology of which is incompletely understood. Discover the latest research on chronic fatigue syndrome here.

Evolution of Pluripotency

Pluripotency refers to the ability of a cell to develop into three primary germ cell layers of the embryo. This feed focuses on the mechanisms that underlie the evolution of pluripotency. Here is the latest research.

Position Effect Variegation

Position Effect Variagation occurs when a gene is inactivated due to its positioning near heterochromatic regions within a chromosome. Discover the latest research on Position Effect Variagation here.

STING Receptor Agonists

Stimulator of IFN genes (STING) are a group of transmembrane proteins that are involved in the induction of type I interferon that is important in the innate immune response. The stimulation of STING has been an active area of research in the treatment of cancer and infectious diseases. Here is the latest research on STING receptor agonists.

Microbicide

Microbicides are products that can be applied to vaginal or rectal mucosal surfaces with the goal of preventing, or at least significantly reducing, the transmission of sexually transmitted infections. Here is the latest research on microbicides.