The genetics of axis specification in Drosophila - Developmental ...
Drosophila is easy to breed, hardy, prolific, tolerant of diverse conditions, and the polytene chromosomes of its larvae are easy to identify (see Chapter 4). The techniques for breeding and identifying mutants are easy to learn.
Axis Specification in Drosophila 4 divides four times with incomplete cytokinesis, to give rise to 16 interconnected cells: 15 nurse cells and the single oocyte precursor. Numerous mRNAs are made in the nurse cells which are transported on microtubules through the cellular interconnections into the enlarging oocyte. 3.
9. The genetics of axis specification in Drosophila - Academia.edu
Recent studies have revealed unexpected mechanisms that drive axis elongation in the Drosophila egg, including an unconventional planar polarity signaling pathway, a distinctive type of morphogenetic movement termed "global tissue rotation," a molecular corset-like role of extracellular matrix, and oscillating basal cellular contractions.
Maternal control of the Drosophila dorsal–ventral body axis
In contrast, a single integrated ensemble of maternal effect genes, central components of which are the ‘dorsal group’ and cactus, orchestrates the formation of the DV axis of the embryo (Table 1).
THE GENETICS OF AXIS SPECIFICATION IN DROSOPHILA DEVELOPMENT …
Our results show different strategies by which maternal gene products, in combination with var ious gap gene proteins, provide position-dependent sets of transcriptional activator/repressor systems which regulate the spatial pattern of specific gap gene expression.
Axis specification in the Drosophila embryo - ScienceDirect
1991年12月1日 · Much of the information for early regional specification along the antero-posterior (Fig. 1) and dorso-ventral axes of the Drosophila embryo is encoded by maternally synthesized molecules that act very rapidly after fertilization [1].
Genetics of Axis Specification in Drosophila | Science Trove
The chapter looks at the gap gene proteins that activate and repress the pair-rule genes, which have modular enhancers that become activated in seven “stripes.” It analyzes how organs form at the intersection of dorsal-ventral and anterior-posterior regions of gene expression.
Anterior–Posterior Axis Specification in Drosophila Oocytes ...
2011年4月6日 · The Drosophila melanogaster anterior–posterior axis is established during oogenesis by the localization of bicoid and oskar mRNAs to the anterior and posterior poles of the oocyte. Although genetic screens have identified some trans -acting factors required for the localization of these transcripts, other factors may have been missed because ...
Axis formation during Drosophila oogenesis - ScienceDirect
2001年8月1日 · Embryonic axis formation in Drosophila is the direct consequence of symmetry-breaking events that take place throughout oogenesis. Oogenesis starts with the first asymmetric division of a germline stem cell to generate a new stem cell and a cystoblast.
The genetics of axis specification in Drosophila
The techniques for breeding and identifying mutants are easy to learn. Moreover, the progress of Drosophila genetics was aided by the relatively free access of every scientist to the mutants and the techniques of every other researcher.