Blastoderm
Embryo, Nonmammalian
Drosophila
Gastrula
The developmental stage that follows BLASTULA or BLASTOCYST. It is characterized by the morphogenetic cell movements including invagination, ingression, and involution. Gastrulation begins with the formation of the PRIMITIVE STREAK, and ends with the formation of three GERM LAYERS, the body plan of the mature organism.
Blastodisc
A small whitish spot on the surface of the EGG YOLK where cleavage begins. Upon fertilization the cytoplasm streams from the vegetal pole away from the yolk to the animal pole where cleavage will occur. This germinal area eventually flattens into a layer of cells (BLASTODERM) that covers the yolk completely.
Drosophila Proteins
Drosophila melanogaster
Body Patterning
The processes occurring in early development that direct morphogenesis. They specify the body plan ensuring that cells will proceed to differentiate, grow, and diversify in size and shape at the correct relative positions. Included are axial patterning, segmentation, compartment specification, limb position, organ boundary patterning, blood vessel patterning, etc.
Chick Embryo
Tribolium
Gene Expression Regulation, Developmental
Coturnix
Heteroptera
Morphogenesis
Quail
Fushi Tarazu Transcription Factors
Organizers, Embryonic
Cells in certain regions of an embryo that self-regulate embryonic development. These organizers have been found in dorsal and ventral poles of GASTRULA embryos, including Spemann organizer in amphibians, and Hensen node in chicken and mouse. These organizer cells communicate with each other via a network of secreted signaling proteins, such as BONE MORPHOGENETIC PROTEINS and their antagonists (chordin and noggin).
Blastula
Zebrafish
Nodal Signaling Ligands
Members of the transforming growth factor superfamily that play a role in pattern formation and differentiation during the pregastrulation and GASTRULATION stages of chordate development. Several nodal signaling ligands are specifically involved in the genesis of left-right asymmetry during development. The protein group is named after a critical region of the vertebrate embryo PRIMITIVE STREAK referred to as HENSEN'S NODE.
Cleavage Stage, Ovum
The earliest developmental stage of a fertilized ovum (ZYGOTE) during which there are several mitotic divisions within the ZONA PELLUCIDA. Each cleavage or segmentation yields two BLASTOMERES of about half size of the parent cell. This cleavage stage generally covers the period up to 16-cell MORULA.
Insect Hormones
Homeodomain Proteins
Germ Layers
Embryonic Induction
Aurora kinase A controls meiosis I progression in mouse oocytes. (1/6)
Aurora kinase A (AURKA), which is a centrosome-localized serine/threonine kinase crucial for cell cycle control, is critically involved in centrosome maturation and spindle assembly in somatic cells. Active T288 phosphorylated AURKA localizes to the centrosome in the late G(2) and also spreads to the minus ends of mitotic spindle microtubules. AURKA activates centrosomal CDC25B and recruits cyclin B1 to centrosomes. We report here functions for AURKA in meiotic maturation of mouse oocytes, which is a model system to study the G(2) to M transition. Whereas AURKA is present throughout the entire GV-stage oocyte with a clear accumulation on microtubule organizing centers (MTOC), active AURKA becomes entirely localized to MTOCs shortly before germinal vesicle breakdown. In contrast to somatic cells in which active AURKA is present at the centrosomes and minus ends of microtubules, active AURKA is mainly located on MTOCs at metaphase I (MI) in oocytes. Inhibitor studies using Roscovitine (CDK1 inhibitor), LY-294002 (PI3K inhibitor) and SH-6 (PKB inhibitor) reveal that activation of AURKA localized on MTOCs is independent on PI3K-PKB and CDK1 signaling pathways and MOTC amplification is observed in roscovitine- and SH-6-treated oocytes that fail to undergo nuclear envelope breakdown. Moreover, microinjection of Aurka mRNA into GV-stage oocytes cultured in 3-isobutyl-1-methyl xanthine (IBMX)-containing medium to prevent maturation also results in MOTC amplification in the absence of CDK1 activation. Overexpression of AURKA also leads to formation of an abnormal MI spindle, whereas RNAi-mediated reduction of AURKA interferes with resumption of meiosis and spindle assembly. Results of these experiments indicate that AURKA is a critical MTOC-associated component involved in resumption of meiosis, MTOC multiplication, proper spindle formation and the metaphase I-metaphase II transition. (+info)The position of the germinal vesicle and the chromatin organization together provide a marker of the developmental competence of mouse antral oocytes. (2/6)
(+info)Examining the contents of isolated Xenopus germinal vesicles. (3/6)
(+info)Mammalian nuclear transplantation to Germinal Vesicle stage Xenopus oocytes - a method for quantitative transcriptional reprogramming. (4/6)
(+info)Inhibition of germinal vesicle breakdown by antioxidants and the roles of signaling pathways related to nitric oxide and cGMP during meiotic resumption in oocytes of a marine worm. (5/6)
(+info)A survey of 6,300 genomic fragments for cis-regulatory activity in the imaginal discs of Drosophila melanogaster. (6/6)
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Blastodisc
The blastodisc is a small disc of cytoplasm that sits on top of the yolk. In birds it is a small, circular, white spot ( ... The blastodisc, also called the germinal disc, is the embryo-forming part on the yolk of the egg of an animal that undergoes ... "Definition of BLASTODISC". www.merriam-webster.com. Retrieved 15 October 2022. Gilbert, Scott F. (2006). Developmental biology ...
Primitive streak
Lateral section through the mammalian blastodisc. "Definition of AMNIOTE". www.merriam-webster.com. Retrieved 11 May 2022. ...
Blastoderm
A blastoderm (germinal disc, blastodisc) is a single layer of embryonic epithelial tissue that makes up the blastula. It ... Blastodisc Embryology Cleavage Gastrulation Gilbert, Scott F. (2000). Early Drosophila Development (6 ed.). Sunderland (MA): ...
Chain catshark
The catshark lays eggs in their blastodisc form. The following exhibits a typical developmental timeline (measurements are ...
Cleavage (embryo)
The embryo forms a disc of cells, called a blastodisc, on top of the yolk. Discoidal cleavage is commonly found in monotremes, ...
Fish development
Cleavage, or initial cell division, can only occur in a region called the blastodisc, a yolk free region located at the animal ... This type of meroblastic cleavage is called discoidal because only the blastodisc becomes the embryo. In fish, waves of calcium ...
Blastocoel
From there the blastodisc, a small cluster of cells in the animal pole of the egg, then undergoes discoidal meroblastic ... Rather, they have small, irregular extracellular spaces that are formed between the cells of the blastodisc sitting atop the ... The shape and formation of the avian blastodisc differs from amphibian, fish, and echinoderm blastulas, but the overall spatial ...
Snake
The snake embryo begins as a zygote, undergoes rapid cell division, forms a germinal disc, also called a blastodisc, then ...
Hypoblast
... or from the blastodisc in reptiles and birds. The hypoblast gives rise to the yolk sac, which in turn gives rise to the chorion ...
Primitive node
In chick development, the primitive node starts as a regional knot of cells that forms on the blastodisc immediately anterior ...
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The Anatomy of an Egg
DeCS
Blastodisc Entry term(s). Area, Germinal Areas, Germinal Blastodiscs Disc, Germinal Discs, Germinal Germinal Area Germinal ... Blastodisc - Preferred Concept UI. M0503154. Scope note. A small whitish spot on the surface of the EGG YOLK where cleavage ... Blastodiscs. Disc, Germinal. Discs, Germinal. Germinal Area. Germinal Areas. Germinal Disc. Germinal Discs. ...
Scoliodon: Distribution, Structure and Sense Organs | Dogfishes
With the expansion of the blastocoel the blastodisc becomes multi- layered. The posterior region of the blastodisc grows faster ... As the embryo elongates along the antero-posterior axis, a head fold is marked off from the blastodisc and it becomes raised up ... By this way of cleavage, a blastodisc is separated from a layer of periblast cells. The periblast cells form a syncitial layer ... The body of the embryo is constricted from the blastodisc and the tail fold is differentiated and extended backward. ...
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Developmental Engineering of Fishes
Figure 3．A-E) Embryos in which the blastodisc in the blastocyst stage was separated from the yolk cell and rotated 180° ... Figure 2．Embryos where the entire blastodisc is transplanted to the animal pole side of another embryo using transplantation ... Figure 1．Blastodisc transplantation at the blastocyst stage. A) Red-stained and unstained transparent embryos. B) Cutting the ... When the blastodisc of the anaphase blastocyst stage is separated from the yolk cell, rotated 180° horizontally and reattached ...
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blastoderm | Taber's Medical Dictionary
NEW (2008) DeCS DESCRIPTORS WITH SCOPE NOTES (UNIT RECORD FORMAT; 21/02/2008
NEW (2008) DeCS DESCRIPTORS WITH SCOPE NOTES (UNIT RECORD FORMAT; 21/02/2008
NEW (2008) DeCS DESCRIPTORS WITH SCOPE NOTES (UNIT RECORD FORMAT; 21/02/2008
NEW (2008) DeCS DESCRIPTORS WITH SCOPE NOTES (UNIT RECORD FORMAT; 21/02/2008
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NEW (2008) DeCS DESCRIPTORS WITH SCOPE NOTES (UNIT RECORD FORMAT; 21/02/2008
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- The blastodisc sits on the yolk and is made up of a single layer of cells that, when fertilized, can become a chick embryo in the proper environment. (mannapro.com)
- The direction of the differentiation of blastodisc cells in the blastocyst stage is determined by the induction signal from the yolk side. (hokudai.ac.jp)
- When the blastodisc of the anaphase blastocyst stage is separated from the yolk cell, rotated 180° horizontally and reattached to the yolk cell, many individuals with two bodies are born from this embryo. (hokudai.ac.jp)
- This is because the body is made up of two groups of cells that have started building the body before or after being separated from the yolk cell (Figure 3 ． Individual with two axes generated from an embryo in which the blastodisc of the anaphase blastocyst of a goldfish is separated, rotated 180°, and reattached. (hokudai.ac.jp)
- For the egg to be truly fertilized, a small clear circle in the center of the yolk, called the blastodisc, must be visible. (exoticbirds.life)
Differentiation1
- Four hours after incubation of the egg shows differentiation of the blastodisc into area pellucida and area opaca. (pfeiffertheface.com)
Viagra2
- straightedges, wroth spinneries yet buy cheap viagra canada blastodisc plugged atop whom fumaric Morquio. (fondren.com)
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Blastoderm1
- Technically speaking, fertile eggs are where the 'blastodisc' turns into a 'blastoderm' - the first stage of a developing embryo. (backyardchickencoops.com.au)
Embryo1
- Fragments of blastodisc can regenerate the complete embryo and Olaparib (AZD2281) re-establish polarity (Bertocchini et al. (science-fair-projects-online.com)
Cleavage2
- Subsequent handling of eggs: Introduction of the eggs is before cleavage of the blastodisc commenced (approximately 2-4 hours after fertilisation). (europa.eu)
- The objectives of the study were a) to monitor changes in the morphology of the blastodisc of the fertilized medaka egg during the first cleavage, and b) to correlate these changes temporally to mitotic events. (nii.ac.jp)
Eggs1
- Subsequent handling of eggs: The eggs were visually inspected before introduction into the test system and were identified as being at early blastodisc stage. (europa.eu)
Tiny1
- All the instructions for a chicken were present in the original tiny blastodisc inside the egg. (creation.com)
System1
- The morphology of the blastodisc was monitored by time-lapse video microscopy and an image analysis system. (nii.ac.jp)
Features1
- Mitosis features color illustrations and photomicrographs (3,100x) of whitefish blastodisc and onion root tip. (carolina.com)
