MOLECULAR BIOLOGY OF THE CELL (LL)
MOLECULAR BIOLOGY OF THE CELL (LL)
6th Edition
ISBN: 9780393876109
Author: ALBERTS
Publisher: NORTON
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Chapter 7, Problem 11P
Summary Introduction

To explain: In the given two sets of cells, the set of cells that will have descendents of the original cell that can “remember” that the progenitor cell has experienced the transient signal.

Concept introduction: Transcription is a process of the central dogma where RNA is produced from the DNA with the help of proteins. One such set of proteins are the transcriptional regulators that initiate the transcription and recruit the RNA polymerase. The other set of proteins are transcriptional repressors that inhibit the transcription and prevent binding of RNA polymerase. Cis-regulatory elements or Cis-regulatory sequences are regions that are found in the non-coding DNA regions that regulate the transcription of adjacent genes.

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You aim to test the hypothesis that the Tbx4 and Tbx5 genes inhibit each other's expression during limb development. With access to chicken embryos and viruses capable of overexpressing Tbx4 and Tbx5, describe an experiment to investigate whether these genes suppress each other's expression in the limb buds. What results would you expect if they do repress each other? What results would you expect if they do not repress each other?
You decide to delete Fgf4 and Fgf8 specifically in the limb bud. Explain why you would not knock out these genes in the entire embryo instead.
You implant an FGF10-coated bead into the anterior flank of a chicken embryo, directly below the level of the wing bud. What is the phenotype of the resulting ectopic limb?  Briefly describe the expected expression domains of 1) Shh, 2) Tbx4, and 3) Tbx5 in the resulting ectopic limb bud.
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Embryology | Fertilization, Cleavage, Blastulation; Author: Ninja Nerd;https://www.youtube.com/watch?v=8-KF0rnhKTU;License: Standard YouTube License, CC-BY