Problem 1 How many protein-coding genes ar... [FREE SOLUTION]

Chapter 5: Problem 1

How many protein-coding genes are contained in the human genome, and why are more than this number of proteins actually found in humans?

Short Answer

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Answer: The human genome contains approximately 20,000 protein-coding genes. However, more than this number of proteins are found in humans due to processes such as alternative splicing and post-translational modifications. These processes lead to the production of multiple protein isoforms and modified proteins, thereby increasing the overall protein diversity in humans.

Step by step solution

Determine the number of protein-coding genes in the human genome

According to the National Human Genome Research Institute, there are approximately 20,000-25,000 protein-coding genes in the human genome. For this exercise, let's use the approximate value of 20,000 as an example.

Learn about alternative splicing

Alternative splicing is a process in which the mRNA transcribed from a single gene can be modified before translation to produce multiple different proteins in a cell. This occurs when different combinations of exons are included in the mature mRNA molecule, resulting in the production of multiple protein isoforms from a single gene.

Learn about post-translational modifications

Post-translational modifications (PTMs) are processes that occur after translation. These modifications can lead to the production of additional protein variants. Some common PTMs include phosphorylation, glycosylation, and acetylation. These modifications can alter protein characteristics such as activity, stability, and localization, which in turn can affect cellular functions.

Understand the factors leading to the increased number of proteins in humans

There are two main factors that lead to the increased number of proteins found in humans compared to the number of protein-coding genes: alternative splicing (discussed in Step 2) and post-translational modifications (discussed in Step 3). These processes result in an increased number of protein isoforms and modifications, allowing a single gene to produce multiple distinct proteins, increasing the overall protein diversity in humans.

Combine the knowledge and answer the question

The human genome contains approximately 20,000 protein-coding genes. However, more than this number of proteins are found in humans due to processes such as alternative splicing and post-translational modifications. These processes lead to the production of multiple protein isoforms and modified proteins, thereby increasing the overall protein diversity in humans.

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How many protein-coding genes are contained in the human genome, and why are more than this number of proteins actually found in humans?

Short Answer

Step by step solution

Determine the number of protein-coding genes in the human genome

Learn about alternative splicing

Learn about post-translational modifications

Understand the factors leading to the increased number of proteins in humans

Combine the knowledge and answer the question

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