A significant number of mutations in the H B B gene that cause human β-thalassemia occur within

Name: Problem 15, Chapter 14: Essentials of Genetics
Uploaded: 2022-03-24T21:18:14-08:00
Duration: 1 min 35 s
Channel: Dennis Howard
Description: A significant number of mutations in the H B B gene that cause human β-thalassemia occur within introns or in upstream noncoding sequences. Explain why mutations in these regions often lead to severe disease, although they may not directly alter the coding regions of the gene.

step 1 This question asks us what happens when there's a mutation in the promoter region? And specifica

Question

A significant number of mutations in the $H B B$ gene that cause human $\beta$ -thalassemia occur within introns or in upstream noncoding sequences. Explain why mutations in these regions often lead to severe disease, although they may not directly alter the coding regions of the gene.

   A significant number of mutations in the $H B B$ gene that cause human $\beta$ -thalassemia occur within introns or in upstream noncoding sequences. Explain why mutations in these regions often lead to severe disease, although they may not directly alter the coding regions of the gene.

Essentials of Genetics

William S. Klug,… 10th Edition

Chapter 14, Problem 15

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Solved by Expert Dennis Howard

03/24/2022

Step 1

The $HBB$ gene encodes the beta-globin protein, which is a subunit of hemoglobin. Hemoglobin is responsible for carrying oxygen in red blood cells. Mutations in the $HBB$ gene can cause beta-thalassemia, a blood disorder that reduces the production of hemoglobin, Show more…

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A significant number of mutations in the $H B B$ gene that cause human $\beta$ -thalassemia occur within introns or in upstream noncoding sequences. Explain why mutations in these regions often lead to severe disease, although they may not directly alter the coding regions of the gene.

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Key Concepts

Pre-mRNA Splicing

Intronic regions contain essential splice site signals, such as the donor and acceptor sequences, which are necessary for accurate removal of introns from the pre-mRNA. Mutations in these sequences can lead to improper splicing, resulting in abnormal mRNA that may be degraded or translated into nonfunctional proteins, thus having severe biological consequences.

Gene Regulation

Noncoding upstream sequences, including promoters and enhancers, are critical for controlling the timing, location, and level of gene expression. Mutations in these regulatory elements can disrupt the binding of transcription factors and other regulatory proteins, leading to reduced or inappropriate expression of the gene, which can significantly affect protein production and function.

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