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Some of the genetic changes alter single DNA building blocks (nucleotides), whereas others rearrange larger segments of mitochondrial DNA.

These changes likely impair the ability of mitochondria to produce energy.

Most people with Kearns-Sayre syndrome have a single, large deletion of mitochondrial DNA.

The deletions range from 1,000 to 10,000 nucleotides, and the most common deletion is 4,997 nucleotides.

This damage can irreversibly alter the function of the inner ear, leading to hearing loss.

Mitochondrial DNA is prone to somatic mutations, which are a type of noninherited mutation.

Researchers speculate that the impaired mitochondria may affect certain cells of the autonomic nervous system, which is the part of the nervous system that controls involuntary body functions such as heart rate, blood pressure, and digestion.

However, it remains unclear how these changes could cause the recurrent episodes characteristic of cyclic vomiting syndrome.

As people age, mitochondrial DNA accumulates damaging mutations, including deletions and other changes.oxidase deficiency (also known as complex IV deficiency), which is a condition that can affect several parts of the body, including the muscles used for movement (skeletal muscles), the heart, the brain, or the liver.The mitochondrial genes associated with cytochrome oxidase is responsible for the last step in oxidative phosphorylation before the generation of ATP.Oxidative phosphorylation is a process that uses oxygen and simple sugars to create adenosine triphosphate (ATP), the cell's main energy source.The remaining genes provide instructions for making molecules called transfer RNA (t RNA) and ribosomal RNA (r RNA), which are chemical cousins of DNA.

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