The LRPPRC gene helps your cells make energy by supporting mitochondria, the parts of cells that act as their power source. If this gene does not work properly, cells may not produce enough energy, especially in the brain, liver, and muscles. Pathogenic variants in the LRPPRC gene cause a rare inherited condition called Leigh syndrome, French-Canadian type. People with this condition may have low muscle tone, feeding problems, developmental delay, and lactic acidosis (a buildup of acid in the blood), with symptoms that can vary.
What is a gene?
Genes are stretches of DNA that give your cells instructions for making molecules or managing processes in the body. Some genes carry the information needed to make proteins, which are the working parts of cells. Other genes are mainly involved in controlling when certain processes happen, where they take place, and how strongly they run. Taken together, genes affect how the body develops and works, and they can also shape how you respond to food, stress, or medications. More on this topic is available in the LearnHub.
Overview
LRPPRCGene function
What if the gene works
The LRPPRC gene helps mitochondria, the cell's energy centers, keep key energy instructions stable so cells can produce energy efficiently. This matters most in tissues with high energy needs, such as the brain, liver, and muscles.
Risk
What if the gene does not work
Variants in the LRPPRC gene can cause Leigh syndrome, a mitochondrial condition. Features include low muscle tone, developmental delay, and lactic acidosis. Milder or more severe variants can affect when symptoms start and how strongly the body is affected.
Treatment
What does that mean for your treatment
For people with a pathogenic variant in the LRPPRC gene, no LRPPRC-specific treatment or drug selection approach is currently established. The LRPPRC gene is being studied as a possible biomarker and treatment target in some cancer and mitochondrial disease research, but this has not yet changed routine care.
Conditions associated with LRPPRC
Gene function
What if the gene works
Inside your cells, the LRPPRC gene supports energy production and helps key cell messages stay stable. Its protein works mainly in mitochondria, the parts of cells that turn food and oxygen into usable energy. Understanding what the LRPPRC gene does helps connect it to the body’s everyday energy needs.
The LRPPRC gene helps keep important mitochondrial messages stable. These messages carry instructions for building key parts of the cell’s energy system.
It helps mitochondria use those messages to make proteins they need for daily energy production. This supports the steady release of usable energy from food and oxygen.
The LRPPRC gene supports the final shaping of mitochondrial messages, including a short protective tail. This helps the messages last long enough to be used well.
What is a variant?
A genetic variant is a small difference in the DNA sequence within a gene. These changes are common and are part of normal human diversity, including differences in appearance, metabolism, and how the body responds to environmental influences. Many variants do not cause any noticeable effect and simply represent 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
To understand how variants influence the LRPPRC gene's function, many changes make the LRPPRC protein unstable or unusually short, so mitochondria cannot handle key RNA messages properly. Some variants only partly reduce protein activity, while more disruptive variants can remove most function. This usually causes a larger drop in energy production and, in LRPPRC-related Leigh syndrome, can be linked to earlier or more severe symptoms.
How variants are linked to conditions
Pathogenic variants in the LRPPRC gene cause Leigh syndrome, French Canadian type, a rare inherited mitochondrial condition. This LRPPRC gene condition is reported most often in people with ancestry from the Saguenay–Lac-Saint-Jean region of Quebec, but it can also appear in other populations. Some people have the classic childhood form, while others have a broader LRPPRC-related mitochondrial disease with different levels of severity.
A variant is not necessarily a diagnosis
Gene variants are a normal feature of human biology and are common across the general population. Most have no direct impact on 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 more than one gene and environmental factors are involved. In some situations, though, a single well-characterized variant in a specific gene is enough to confirm a diagnosis.
Are there things that can increase or change my risk?
For LRPPRC, risk is mainly shaped by inheritance: a child is affected when they inherit a disease-causing change from both parents, so risk is higher when both parents carry one. There is not yet broadly confirmed evidence that lifestyle or everyday exposures meaningfully change the chance of developing an LRPPRC-related condition.
Inheritance of LRPPRC variants
LRPPRC gene inheritance for the best known LRPPRC-related condition follows an autosomal recessive pattern. This means a child inherits one LRPPRC variant from each parent, and both parents are usually healthy carriers. When two carriers have a child together, each pregnancy has a 25% chance of being affected, a 50% chance of producing a carrier, and a 25% chance of inheriting neither variant. Because the LRPPRC gene is on a numbered chromosome rather than a sex chromosome, this pattern is the same for boys and girls.
What does my LRPPRC result mean for my family?
For many living with an LRPPRC-related condition, the family meaning is usually that close relatives may also carry the same gene change without having symptoms. Brothers and sisters may have the same condition or be carriers, and parents are often healthy carriers. Family members may want to talk with their care team about whether genetic counseling or testing could help clarify their own chances.
Genetic information
Genetic testing
How you find out about variants
Genetic testing for LRPPRC variants uses a blood sample or cheek swab to read the LRPPRC gene and look for changes linked to Leigh syndrome, French-Canadian type. Results may show a disease-causing variant, a harmless variant, or an unclear finding called a variant of uncertain significance.
When should I consider getting a genetic test?
Testing for the LRPPRC gene may be considered if a baby or child has signs of a severe energy-production condition, especially with French-Canadian ancestry or a family history of early childhood illness or sudden death. It can also confirm whether parents or relatives are carriers when an LRPPRC-related condition is known in the family.
A genetic result is only one part of your health story
Genetic results can provide useful insight, but how much they reveal depends on the condition and the kind of variant involved. Over time, many factors, including lifestyle, environment, age, and medical history, also shape how the body functions. In some conditions, especially those influenced by many genes, genetic information offers context rather than certainty and is best interpreted alongside other parts of care. In other situations, a genetic result can give a clear answer. In areas like medication response, genetic results can also help put individual experiences into context.
Pharmacogenetics
How variants shape your response to medicine
Genetic variation can affect how people respond to medicines. Small differences in genes can change how the body absorbs, breaks down, transports, or responds to a drug, so the same treatment may work better for one person than for another. This is common and can influence how much benefit someone gets from a medicine or how sensitive they are to side effects.
What is Pharmacogenetics?
Pharmacogenetics examines how genetic differences affect a person’s response to medications. It studies gene and drug patterns to help explain why the same treatment may work differently from one person to another. For many medicines, genes influence both how the body processes a drug and how strong its effects may be. This information can support more informed and individualized treatment decisions. If you want to learn more about this topic, more information is available in the LearnHub.
Drugs influenced by the LRPPRC gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in guiding medicine choice or response, so questions about side effects, new symptoms, or treatment changes are best discussed with your doctor or pharmacist.
History
Doctors first recognized an unusual inherited neurologic condition in families from the Saguenay–Lac-Saint-Jean region of Quebec, where the pattern appeared more often than expected in the general population. Initially understood only through visible traits, later recognized as tied to a specific gene, this condition became known as French-Canadian type Leigh syndrome. In the early 2000s, researchers linked it to the LRPPRC gene, which helped explain why the condition clustered in certain families and communities. That discovery was an important example of how founder variants can shape health patterns in a region over generations. These historical steps shaped today’s understanding of the LRPPRC gene and its place in inherited neurologic disease.