The MRPS18A gene helps mitochondria, the parts of your cells that make energy, build proteins needed for normal energy production. What this gene does can influence how your body uses energy, so if it does not work properly, cells may struggle to meet the needs of the brain, muscles, and other active tissues. Rare harmful variants in the MRPS18A gene have been linked to mitochondrial conditions that can involve developmental delay, low muscle tone, and nerve or movement problems.
What is a gene?
Genes are stretches of DNA that give your cells instructions for making molecules or regulating activities in the body. Some genes hold the information needed to make proteins, which do much of the cell’s work. Others mainly direct when certain processes happen, where they happen, and how active they are. Together, genes affect how your body develops and functions, and they can also shape how you respond to food, stress, or medications. For a more detailed look at this topic, you can find additional information in the LearnHub.
Overview
MRPS18AGene function
What if the gene works
The MRPS18A gene helps mitochondria, your cells’ energy centers, make the proteins they need. This supports normal energy production and steady function in many tissues.
Risk
What if the gene does not work
Changes in the MRPS18A gene can reduce how well cells make mitochondrial proteins, which may weaken energy production. Milder and more severe variants can impair this process to different degrees, depending on how much protein function remains.
Treatment
What does that mean for your treatment
No MRPS18A-specific treatment or drug-selection approach is currently established in clinical guidelines.
Gene function
What if the gene works
Your cells need the MRPS18A gene to help mitochondria, the parts of cells that make energy, run smoothly. Its protein works inside the machinery that makes proteins within mitochondria. This is a key part of how the MRPS18A gene supports mitochondrial function and energy production.
The MRPS18A gene helps mitochondria follow their own genetic instructions and make a small set of proteins they need. Its protein forms part of a ribosome, the protein-making machine inside mitochondria.
By helping mitochondria make their own proteins, the MRPS18A gene supports oxidative phosphorylation (the main way cells turn food and oxygen into usable energy). This helps cells keep up with everyday energy needs.
Its protein helps keep the mitochondrial protein-making machinery organized and working smoothly. That steady setup allows mitochondria to build proteins in a controlled, reliable way.
What is a variant?
A genetic variant is a small difference in the DNA sequence of a gene. These changes are common and are part of normal human diversity, such as differences in appearance, metabolism, or the way the body responds to environmental influences. Many variants have no noticeable effect and simply represent natural genetic variation. In some situations, though, a variant can change the function of a gene more substantially and may contribute to or cause a genetic condition.
Genetic variants
What if the gene does not work
Variants in the MRPS18A gene can change the shape or stability of the S18A protein, making it harder for cells to assemble the small mitochondrial ribosome, the protein making structure inside mitochondria. When this happens, mitochondrial protein production may drop, and energy making pathways can work less efficiently. MRPS18A gene variants can range from milder changes that partly reduce function to more severe variants that leave little or no function.
How variants are linked to conditions
At this time, the MRPS18A gene does not yet have a broadly confirmed link to a specific health condition, so information about MRPS18A gene variants and health conditions is still developing. Anyone with a confirmed MRPS18A-related diagnosis should rely on guidance from their doctor or genetic counselor for interpretation and follow-up.
A variant is not necessarily a diagnosis
Variants in genes are a usual feature of human biology and are widespread across the population. Most do not directly affect health and instead reflect normal human diversity. For many genes, having a variant associated with a condition points to a possible link rather than a clear diagnosis, particularly when several genes and environmental influences also play a role. In certain situations, though, one well understood variant in a particular gene is enough to confirm a diagnosis.
Are there things that can increase or change my risk?
There is not yet broadly confirmed evidence on specific factors that increase or reduce health risks related to the MRPS18A gene. For many living with an MRPS18A-related condition, risk is mainly linked to the genetic change itself rather than clear lifestyle or environmental factors.
Inheritance of MRPS18A variants
There is not yet a broadly confirmed, disease-specific Mendelian pattern for how MRPS18A gene variants are inherited, so the answer to how MRPS18A gene variants are inherited is still being clarified as research develops. The MRPS18A gene is located on chromosome 6, which is an autosome. That means each person inherits one copy of the MRPS18A gene from each parent.
What does my MRPS18A result mean for my family?
There is not yet a broadly confirmed inheritance pattern tied to a specific, well-established condition for MRPS18A, although this can change as research grows. If you have a specific MRPS18A result, the meaning for parents, children, brothers, sisters, or other relatives depends on the exact change found and the health picture in your family.
Genetic information
Genetic testing
How you find out about variants
MRPS18A genetic testing usually checks a blood or saliva sample to look for variants in the MRPS18A gene. Labs read the gene's DNA sequence and compare it with the usual pattern, often as part of a broader rare disease panel, exome, or genome test.
When should I consider getting a genetic test?
Genetic testing for the MRPS18A gene may be considered when a child has signs of an inherited condition that affects how the body’s cells make energy, especially with developmental problems, low muscle tone, seizures, or poor growth. It can also be useful when a close family member has a known MRPS18A variant.
A genetic result is only one part of your health story
A genetic result can provide useful insight, but how much it explains depends on the condition and the type of variant involved. Over time, many factors shape how the body works, including lifestyle, environment, age, and medical history. In some conditions, especially those influenced by many genes, genetic information offers context rather than certainty and is most helpful when considered alongside other parts of care. In other situations, a genetic result may give a clear answer. In areas such as medication response, genetic results can also help put individual experiences in perspective.
Pharmacogenetics
How variants shape your response to medicine
Genetic variation can affect how people respond to medicines. Some people break down a drug more slowly or more quickly, while others may be more or less sensitive to its effects. This helps explain why the same treatment works well for one person, has less effect in another, or causes more side effects in someone else. These differences are common and are one reason medication response can vary from person to person.
What is Pharmacogenetics?
Pharmacogenetics is the area of study focused on how differences in genes affect the way people respond to medicines. It examines relationships between genes and medications to help explain why the same treatment can work differently from one person to another. For many drugs, genes influence either how much effect a medicine has or how the body handles it. This information can support treatment choices that are both better informed and more personalized. More detailed information on this topic is available in the LearnHub.
Drugs influenced by the MRPS18A gene
When should I seek medical advice?
There is no widely confirmed evidence that changes in this gene should guide medicine choices, so questions about side effects, new symptoms, or whether a treatment is working are best discussed with your doctor.