EBK MOLECULAR CELL BIOLOGY
EBK MOLECULAR CELL BIOLOGY
8th Edition
ISBN: 8220103601887
Author: LODISH
Publisher: YUZU
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Chapter 21, Problem 16RTC
Summary Introduction

(a)

To write:

Effect of mutation in Bad such that it cannot be phosphorylated on apoptosis.

Introduction:

Bad gene is both a positive and negative regulator of apoptosis. When non-phosphorylated it binds to Bcl-2 protein and prevents its anti-apoptotic activity. However, a phosphorylated Bad cannot bind to Bcl-2

Summary Introduction

(b)

To write:

Effect of overexpression of Bcl-2 on apoptosis.

Introduction:

Bcl-2 is a negative regulator of apoptosis and the overexpression of Bcl-2 blocks the movement of cytochrome-c from the mitochondrial membrane to the cytosol.

Summary Introduction

(c)

To write:

Effect of mutation in Bax gene such that it cannot form homodimers.

Introduction:

Bax if the first pro-apoptotic gene to be discovered. Its sequence is somewhat related to the Bcl-2 and CED-9 gene both of which are known to be the suppressor of apoptosis. However, overexpression of Bax gene can cause cell death.

Summary Introduction

To write:

Which of the mutations discussed above are likely to be present in cancer cells.

Introduction:

Cells that undergo uncontrolled cell division and have the ability to metastasize to other parts of the body are known as cancer cells. These cells have lost the ability to undergo apoptosis as they do not die and keep of dividing.

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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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What is cancer? What causes cancer and how is it treated? *UPDATE*; Author: Cancer Treatment Centers of America - CTCA;https://www.youtube.com/watch?v=_N1Sk3aiSCE;License: Standard Youtube License