Pax 3 is a transcription factor that is expressed in neural crest cells during embryogenesis. During embryogenesis, neural crest cells (NCCs) migrate from the developing spinal cord to the developing embryo. Pax3 protein binds to specific regions in the DNA and activates other genes. These genes cause the neural crest cells to differentiate into tissue types such as melanocytes in skin.
Pax 3 is expressed in NCCs in the developing PNS, the NC-derived craniofacial mesenchyme, as well as the cardiac NCCs that are migratory on days E10 and E12 in developing mouse embryo. Thus, Pax 3 maintained progenitor populations while allowing differentiation into melanocytes and expression in neural crest stem cells. Pax3 is also required for cardiac neural crest cells to complete migration to developing heart.
Pax3 are transcription factors that have a paired DNA binding domain. They have an additional DNA binding homeodomain and an octapeptide. The octapeptide binds to different cofactors, which inhibit downstream signaling. The transactivation domain is present in C-terminus. In mice, Pax3 along with Pax7 can upregulate the expression of Snail, Foxd3 (forkhead box D3) and Sox genes. These genes are required for formation of a competent NC cell. It also upregulates expression of HES1 required for maintenance of neural stem cells. As it can bind DNA and upregulate expression of other genes, it is a transcription factor.
Pax 3 is required for NC early progenitor formation and speciation. It works with Tgfb2, Hes1, Neurog2 and Sox9 to maintain NC in progenitor state before they can migrate. Pax3 induced Mitf ((microphthalmia-associated transcription factor) expression, which helps melanoblasts to survive during embryogenesis, until they can form melanocytes later after birth. Pax3 is also required to inhibit myelination gene program by inducing Oct6 and Krox2o in promyelinating stem cells.
how does pax3 act as a transcription factor to support its role in embryonic development.
Last week we discussed the role of general transcription factors in forming the transcription initiation complex in eukaryotes. Next week we will look more closely at the regulation of gene expression and the role played by specific transcription factors. Prokaryotes and eukaryotes utilize very different mechanisms for determining which genes are turned on and off and when. In lieu of the prokaryotic operon model, eukaryotes employ a combinatorics approach utilizing both general and specific transcription factors. For this week’s forum,...
The hunchback gene has an enhancer containing 3 binding sites for the transcription factor Bicoid. How could the loss of a single DNA binding site -leaving the 2 others intact- act to reduce gene expression of hunchback by more than 1/3 ? A. Bound Bicoid transcription factor molecules interact antagonistically to cause maximal gene expression B. Bound Bicoid transcription factor molecules interact additively to cause maximal gene expression C. Bicoid does not bind to the hunchback enhancer D. Bound Bicoid...
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Describe the role of organizational development in contemporary organizations. How does organizational development help organizations prepare for or implement change? Provide an example from a hospital..
Describe the role of organizational development in contemporary organizations. How does organizational development help organizations prepare for or implement change? Provide an example from your organization.
9. Describe the role of transcription factors in gene expression and explain how transcription factors can allow cells to be different from each other.
33. How can the function of an essential gene required for embryonic development be studied in an adult knockout mouse? 34. How is the 5´ cap added to nascent RNAs? 31. Describe some typical features of a restriction enzyme recognition sequence.
How does the number of embryonic tissue layers an animal have contribute to the complexity of its body plan?
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Gene A is essential for early embryonic development in human. A mutant version of A (Am) causes cell number to decease in human embryo during its early developmental stage. A is highly conserved between human and Drosophila, indicating the functional importance of A. It is known that the homozygous Am/Am Drosophila is embryonic lethal. You were tasked to design an experiment to study the question how Am causes cell death in Drosophila. What sequences should the completed chimeric plasmid have?