The MRPS33 gene helps mitochondria, the parts of cells that make energy, build the proteins they need to work properly. The protein made by this gene helps your cells keep energy production steady, especially in the brain, heart, and muscles. If the MRPS33 gene does not work well, it can lead to a rare mitochondrial condition with poor growth, low muscle tone, developmental delay, feeding problems, or lactic acidosis (a buildup of acid in the blood).
What is a gene?
A gene is a section of DNA that gives your cells instructions to make molecules or regulate activities in the body. Some genes carry the directions for producing proteins, the main working parts of cells. Other genes mainly help determine when certain processes happen, where they happen, and how strongly they run. Together, genes affect how the body develops and functions, and they can influence how you respond to food, stress, or medications. If you want to explore this topic in more depth, you can learn more in the LearnHub.
Overview
MRPS33Gene function
What if the gene works
The MRPS33 gene helps mitochondria, the cell's energy makers, build proteins. This supports energy production needed for routine cell work.
Risk
What if the gene does not work
When the MRPS33 gene does not work properly, it can cause a rare mitochondrial condition affecting brain and muscle energy supply. Milder and severe variants can change when problems start and how much development, movement, and muscle tone are affected.
Treatment
What does that mean for your treatment
For pathogenic variants in the MRPS33 gene, no MRPS33-specific treatment or management approach is currently established.
Gene function
What if the gene works
Your cells need the MRPS33 gene to keep mitochondria, the parts of the cell that make usable energy, working smoothly. It helps mitochondria build a small set of proteins needed for daily energy production. This supports steady energy use in organs such as the brain, heart, and muscles.
Inside mitochondria, the MRPS33 gene helps build part of the small ribosome, the protein-building machine used there. This gives mitochondria the tools to make a select group of their own proteins.
This gene helps mitochondria read instructions carried by mitochondrial DNA, their own small set of genetic directions. That step is needed so proteins can be assembled in the right order.
By helping mitochondria make the proteins needed for energy production, the MRPS33 gene supports the system that turns nutrients and oxygen into usable cellular energy. This helps cells meet everyday energy demands.
What is a variant?
A genetic variant is a small alteration in the DNA sequence of a gene. These changes are common and help account for normal human diversity, including differences in appearance, metabolism, or how the body responds to environmental influences. Many variants do not have any noticeable effect and simply represent natural genetic variation. In some situations, however, a variant can change a gene’s function more substantially and may contribute to or cause a genetic condition.
Genetic variants
What if the gene does not work
Variants in the MRPS33 gene can alter the protein’s shape, shorten it, or reduce how much of it the cell makes, which may weaken its ability to join the mitochondrial ribosome. In practice, how MRPS33 variants affect mitochondrial protein synthesis can range from mild slowing to a near complete loss of this process. Milder variants may leave some residual activity, while more severe variants can markedly disrupt ribosome assembly and reduce energy production inside cells.
How variants are linked to conditions
The MRPS33 gene does not yet have a broadly confirmed link to a specific health condition, although research on health conditions linked to MRPS33 gene variants is still evolving. If you have a reported variant in the MRPS33 gene or a diagnosis that has been discussed in relation to this gene, your doctor or genetic counselor can explain what that result may mean for you and your family.
A variant is not necessarily a diagnosis
Genetic variants are a usual part of human biology and are widespread in the general population. Most do not have a direct effect on health and simply contribute to natural human diversity. For many genes, having a variant associated with a condition suggests a possible link rather than a definite diagnosis, especially when multiple genes and environmental factors 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 risk related to the MRPS33 gene. If a change in MRPS33 has been found in you or your family, a doctor or genetic counselor can help explain what that result may mean for your personal risk.
Inheritance of MRPS33 variants
MRPS33-related conditions are inherited in an autosomal recessive pattern. This means a child usually inherits one MRPS33 variant from each parent, and both parents are typically healthy carriers. When both parents carry a variant in the MRPS33 gene, each pregnancy has a 25% chance of being affected, a 50% chance of resulting in a carrier child, and a 25% chance of inheriting neither variant. Because the MRPS33 gene is on an autosome, this inheritance pattern is the same for boys and girls.
What does my MRPS33 result mean for my family?
For families with an MRPS33-related condition, the pattern is typically recessive, which means parents are often healthy carriers. Brothers and sisters may also be carriers, and in some families a sibling could have the same condition. Close relatives may want to learn whether the family change is present in them, especially if they are planning children.
Genetic information
Genetic testing
How you find out about variants
To find out whether you carry an MRPS33 variant, genetic testing for MRPS33 variants is done on a blood sample, saliva sample, or cheek swab. A lab reads the DNA sequence of the MRPS33 gene and compares any changes with trusted evidence to classify each variant as benign, uncertain, or pathogenic.
When should I consider getting a genetic test?
Genetic testing for the MRPS33 gene may be considered when a baby or child has signs of a rare inherited condition that affects how cells make energy, such as developmental delay, low muscle tone, feeding problems, or seizures, especially if similar problems run in the family. It can also help explain abnormal metabolic or brain test results.
A genetic result is only one part of your health story
Genetic results can be informative, but how much they reveal varies by the condition and the specific type of variant. Over time, the way the body works is also shaped by factors such as lifestyle, environment, age, and medical history. For some conditions, especially those influenced by many genes, genetic information offers context rather than certainty and is best understood together with other parts of care. In other situations, a genetic result may give a clear answer. In areas like medication response, these results can help put individual experiences into context.
Pharmacogenetics
How variants shape your response to medicine
Genetic variation can affect how people respond to medicines. Two people can take the same treatment, yet one may get the expected benefit while the other may notice less effect or more side effects. Part of the reason is that inherited differences can change how the body breaks down, moves, or responds to a drug. This kind of variation is common and is one reason medication response can differ from person to person.
What is Pharmacogenetics?
Pharmacogenetics examines how genetic differences shape a person’s response to medications. It looks at links between genes and drugs to better understand why the same treatment may work differently from one person to the next. For many medicines, genes influence how strongly a drug works or how the body processes it. This information can help support more informed, individualized treatment decisions. To explore this subject in greater detail, you can learn more in the LearnHub.
Drugs influenced by the MRPS33 gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in predicting how medicines will work, so concerns about side effects, new prescriptions, or changes to treatment are best discussed with your doctor.