By What is the Dorsoventral axis?
dorsoventral axis one passing from the posterior to the anterior surface of the body. mean electrical axis the average direction of the activation or repolarization process during the cardiac cycle; it may be determined for any deflection (P, QRS, ST-T) and in the frontal, transverse, or sagittal plane.
Which gene helps establish the dorsal-ventral axis in a Drosophila embryo?
Spätzle activates Toll, a transmembrane receptor in the embryonic membrane. Transmission of the Toll signal into the embryo leads to the formation of a ventral-to-dorsal gradient of the transcription factor Dorsal within the nuclei of the syncytial blastoderm stage embryo.
What is pattern formation in Drosophila?
It is during the early stages of fly embryonic development that the body plan of a fly is arranged into what will become the adult fly. Pattern formation is the development of a body according to a specific and planned spatial arrangement.
What is axis formation?
Nowadays, the most research on axis formation is the formation of axis of Drosophila and vertebrates. The formation of axis is completed under the multi-level and network control of a series of genes. The axis refers to the anterior-posterior axis and the dorsal-ventral axis of the embryo.
What is the difference between anteroposterior axis and Dorsoventral axis?
As adjectives the difference between dorsoventral and anteroposterior. is that dorsoventral is of, pertaining to, or situated at the back and belly of something while anteroposterior is (anatomy) anterior to posterior; front-to-back.
What is anteroposterior axis and Dorsoventral axis?
Like most organisms, Drosophila embryos develop in relation to two orthogonal axes, the anteroposterior and dorsoventral. These two axes are established by four independent systems of maternal information. Here we show by analyzing their embryonic fate map, that K10 embryos still possess a dorsoventral polarity.
What kind of protein is gurken?
TGF-alpha-like protein
“Gurken, a TGF-alpha-like protein involved in axis determination in Drosophila, directly binds to the EGF-receptor homolog Egfr.” Shmueli A., Cohen-Gazala O., Neuman-Silberberg F.S.
What is segmentation pattern formation?
A segmentation gene is a gene involved in the early stages of pattern formation that define repeated units (metameres) in a segmented organism, usually the embryo. The expression of gap genes result in the formation of gaps in the normal pattern of structure in the embryo.
What is the main features of Drosophila embryo development?
Drosophila melanogaster: early embryogenesis The Drosophila egg is the shape of a sausage. It has a micropyle at the anterior end (site of sperm entry). With fertilization, the fusion of nuclei is followed by rapid mitotic divisions (90 minutes) and no cleavage. A syncytium is formed (many nuclei/common cytoplasm).
Why is Axis formation important?
The formation of the central left-right axis is an important process during development. This internal asymmetry is established very early during development and involves many genes. Research is still ongoing to fully understand the developmental implications of these genes.
What is embryonic pattern?
During embryogenesis, information encoded in the genome is translated into cell proliferation, morphogenesis, and early stages of differentiation. Embryonic pattern arises from the spatial and temporal regulation and coordination of these events.