The MRPS31 gene helps mitochondria, the parts of your cells that make energy, build some of the proteins they need to work. The protein made by this gene helps your cells keep energy production running, especially in the brain, muscles, and other tissues with high energy needs. If both copies of the gene do not work properly, a person can develop a rare mitochondrial condition that may cause low muscle tone, feeding and growth problems, developmental delay, and high lactic acid levels.
What is a gene?
Genes are stretches of DNA that provide instructions cells use to make molecules or regulate activities in the body. Some genes carry the information needed to make proteins, which are the working parts of cells. Others mainly direct when certain processes happen, where they take place, and how active they are. Taken together, genes affect how the body develops and works, and they can shape how you respond to food, stress, or medications. For a closer look at this topic, you can find more in the LearnHub.
Overview
MRPS31Gene function
What if the gene works
The MRPS31 gene helps mitochondria, the cell’s energy producers, make some of their own proteins. This supports normal energy production and healthy function in tissues that need a lot of energy.
Risk
What if the gene does not work
Variants in the MRPS31 gene can cause a mitochondrial condition affecting energy production, with developmental delay, low muscle tone, and poor growth. Different variants can influence when symptoms start and how strongly the brain and muscles are affected.
Treatment
What does that mean for your treatment
No treatment or management approach specific to pathogenic variants in the MRPS31 gene is currently established.
Gene function
What if the gene works
Inside your cells, mitochondria need their own protein-making machinery. The MRPS31 gene provides instructions for one small part of that system. When it works properly, mitochondria can read their genetic messages and build proteins that help supply energy for everyday cell activity.
The MRPS31 gene helps form the mitochondrial ribosome, the protein-making machine inside mitochondria. This allows mitochondria to build a small set of proteins from their own genetic instructions.
Its protein sits in the small part of that machine, which helps line up RNA messages for accurate reading. This keeps mitochondrial protein building organized and steady.
By helping mitochondria make key proteins, the MRPS31 gene supports the energy system that powers tissues throughout the body. Understanding what the MRPS31 gene does helps explain how cells meet everyday energy needs.
What is a variant?
A genetic variant is a small change in the DNA sequence within a gene. These changes are common and help shape normal human diversity, including differences in appearance, metabolism, or the way the body responds to environmental influences. Many variants do not have any noticeable effect and are simply part of natural genetic variation. In some situations, though, a variant can change how a gene functions more substantially and may contribute to or cause a genetic condition.
Genetic variants
What if the gene does not work
Variants in the MRPS31 gene can make the mitochondrial ribosome small subunit unstable or poorly assembled, so mitochondria make fewer of the proteins they need for energy production. This is the main way MRPS31 gene variants affect mitochondrial protein synthesis. Milder missense variants may leave some residual function, while more disruptive nonsense, frameshift, or splice variants can sharply reduce or abolish the MRPS31 protein and cause a stronger cellular effect.
How variants are linked to conditions
Research on how MRPS31 gene variants are linked to conditions is still developing, and this gene does not yet have a broadly confirmed link to one specific health condition. If you carry a reported MRPS31 variant and have a confirmed diagnosis, the most useful guidance comes from your doctor or genetic counselor, who can interpret your result in the context of your symptoms and family history.
A variant is not necessarily a diagnosis
Variants in genes are a normal part of human biology and are widely found in the general population. Most do not directly affect health and simply reflect natural human diversity. For many genes, carrying a variant associated with a condition suggests a possible link rather than a definite diagnosis, especially when multiple genes and environmental factors also play a role. In some situations, though, a single well-characterized variant in a specific gene can be 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 MRPS31 gene. For many living with a disease-causing MRPS31 change, risk is mainly shaped by the genetic change itself rather than lifestyle or common environmental factors.
Inheritance of MRPS31 variants
MRPS31-related conditions are inherited in an autosomal recessive pattern. In practical terms, how MRPS31 variants are inherited in families usually means a child needs to receive one altered copy of the MRPS31 gene from each parent to be affected. Parents who each carry one variant are often unaffected themselves. With each pregnancy, they have a 25% chance of having an affected child, a 50% chance of having a child who is a carrier, and a 25% chance of having a child who inherits neither familial variant.
What does my MRPS31 result mean for my family?
For MRPS31, the clearest family pattern is that parents can be healthy carriers while a child is affected only after inheriting a changed copy from both sides. This can mean brothers and sisters may also be affected or may be carriers, and other relatives on either side of the family could carry the same change without knowing it. Family implications can vary with the exact result, but carrier testing is often most relevant for close relatives.
Genetic information
Genetic testing
How you find out about variants
To look for changes in the MRPS31 gene, doctors use genetic testing for MRPS31 variants on a blood or saliva sample. A lab reads the gene’s DNA code and compares it with the usual sequence to see whether a variant is present, then reports whether the finding may help explain health features or family risk.
When should I consider getting a genetic test?
Genetic testing for the MRPS31 gene may be considered if a child has signs of a rare condition affecting the body’s energy-making system, such as developmental delay, low muscle tone, seizures, feeding problems, or repeated high lactic acid levels. It can also help if a close family member has a harmful MRPS31 variant or a similar diagnosed condition.
A genetic result is only one part of your health story
Genetic results can provide helpful insight, but how much they explain varies based on the condition and the specific type of variant. Many other factors, including lifestyle, environment, age, and medical history, also influence how the body functions over time. For some conditions, especially those shaped by many genes, genetic information provides context rather than certainty and is most useful when viewed alongside other parts of care. In other situations, a genetic result can offer a clear answer. In areas like medication response, genetic results can also help put personal experiences into context.
Pharmacogenetics
How variants shape your response to medicine
Genetic variation can affect how people respond to medicines. This helps explain why the same drug may work well for one person, have less effect in another, or cause more side effects in someone else. Part of the difference comes from how the body breaks down, moves, and uses a medication. These differences are common and can influence both how well a treatment works and how sensitive a person is to it.
What is Pharmacogenetics?
Pharmacogenetics examines how genetic variation shapes a person’s response to medications. It studies connections between genes and drugs to clarify why the same treatment may work differently from one person to another. For many medicines, genes affect both how the body processes a drug and how strong its effects may be. This information can support more informed, individualized treatment decisions. You can read more about this topic in the LearnHub.
Drugs influenced by the MRPS31 gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in guiding medication choices, so any concerns about side effects, new symptoms, or how your medicines may be affecting you are best discussed with your doctor.
History
In recent decades, awareness of the MRPS31 gene’s role has grown as researchers worked to map the many nuclear genes connected to mitochondrial biology. MRPS31 was identified during the broader effort to catalog the proteins that make up the human mitochondrial ribosome, an important step in late 20th century and early genomic research. Early studies helped place this gene within a larger family of mitochondrial ribosomal protein genes that were being defined one by one. Building on this early work, scientists uncovered more about the gene through DNA sequencing and rare disease research. As clinical genetics expanded, MRPS31 gained added relevance when variants in this gene were linked to inherited mitochondrial conditions. These historical steps shaped today’s understanding of MRPS31 in medical genetics.