The GATB gene helps mitochondria, the energy making parts of cells, build certain proteins they need to work properly. If the GATB gene does not work as it should, cells may struggle to make energy efficiently, especially in organs with high energy needs such as the brain, muscles, and heart. People with harmful variants in the GATB gene can have a rare inherited mitochondrial condition that may affect movement, muscle tone, development, or organ function. Many variants in this gene have little or no effect, while a small number can disrupt how the gene works.
What is a gene?
Genes are sections of DNA that carry instructions your cells use to make molecules or regulate activities in the body. Some genes hold the directions for producing proteins, the parts of cells that do much of the work. Other genes mostly help manage when certain processes happen, where they happen, and how strongly they operate. Taken together, genes affect how the body develops and works, and they can also influence how you respond to food, stress, or medications. To go into this topic in more detail, you can find more in the LearnHub.
Overview
GATBGene function
What if the gene works
Inside mitochondria, the GATB gene helps prepare a helper molecule used to build proteins. This supports normal mitochondrial protein production and helps your cells make energy for everyday body functions.
Risk
What if the gene does not work
Variants in the GATB gene can disrupt mitochondrial energy production, often leading to lactic acidosis and heart muscle disease, sometimes with developmental or muscle symptoms. Effects can range from milder to more severe, which may influence when symptoms begin.
Treatment
What does that mean for your treatment
No treatment or drug choice is currently guided specifically by pathogenic or loss-of-function variants in the GATB gene.
Gene function
What if the gene works
Your cells need a steady way to build the proteins used inside mitochondria, the parts that make most of your energy. The GATB gene helps with one small but essential step in that process. It prepares a helper molecule called transfer RNA so mitochondria can place the right amino acid into a growing protein.
Inside mitochondria, the GATB gene helps prepare transfer RNA, a helper molecule that places amino acids into new proteins. It changes a loaded glutamate to glutamine on the correct transfer RNA so protein building stays accurate.
Its protein forms part of a three piece enzyme inside mitochondria. Working with the other parts, it completes a key step that makes this transfer RNA ready for protein production.
By helping mitochondria make a small set of their own proteins, the GATB gene supports the machinery that turns food and oxygen into usable energy. This is a central part of how the GATB gene helps mitochondria make proteins.
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, including differences in appearance, metabolism, or how the body responds to environmental influences. Many variants do not cause any noticeable effect and simply represent natural genetic variation. In some situations, however, 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
Changes in the GATB gene can make the GATB protein unstable, lower its activity, or stop it from joining the mitochondrial protein complex it works with. This means GATB gene variants may reduce mitochondrial protein production and weaken oxidative phosphorylation, the process cells use to make energy. Milder variants often leave some activity, while more severe variants can cause a larger loss of function and are linked to earlier or more marked features of combined oxidative phosphorylation deficiency.
How variants are linked to conditions
Rare, disease-causing variants in the GATB gene are linked to a rare inherited mitochondrial disease called combined oxidative phosphorylation deficiency. People with this diagnosis may have low muscle tone, developmental delay, seizures, high lactate levels, or heart muscle disease, often beginning in infancy or childhood. Features can vary from person to person.
A variant is not necessarily a diagnosis
Genetic variants are a routine part of human biology and are common across the general population. Most do not directly affect 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 several genes and environmental factors are involved. In some situations, though, a single well characterized variant in a particular 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 risk related to the GATB gene. For many living with a disease-causing GATB change, risk is mainly linked to the inherited gene change itself rather than lifestyle or common environmental factors.
Inheritance of GATB variants
Variants in the GATB gene are inherited in an autosomal recessive pattern. This means a child usually develops a GATB-related condition only when they inherit one changed copy of the gene from each parent. Parents who carry one variant are typically carriers, and with each pregnancy they have a 25% chance of having an affected child, a 50% chance of having a child who is also a carrier, and a 25% chance of having a child with two working copies of the gene. Sons and daughters are affected at the same rate.
What does my GATB result mean for my family?
For GATB, the main confirmed family pattern is recessive, which usually means parents are healthy carriers. Brothers and sisters may also be affected or may be carriers, and other relatives on both sides of the family could carry the same change. Because of that, family members may want to talk with their care team about whether genetic testing would be helpful for them.
Genetic information
Genetic testing
How you find out about variants
Genetic testing for GATB variants usually uses a blood sample, though saliva can sometimes be used. A lab reads the DNA sequence in the GATB gene as part of a single gene test, a multi gene panel, or broader exome or genome testing, then reports whether a variant was found and how it is classified.
When should I consider getting a genetic test?
Genetic testing for GATB may be considered when a baby or child has signs of a rare inherited condition that affects the body’s energy supply, especially severe heart muscle disease, high lactic acid levels, poor growth, or developmental delay. It can also help clarify carrier status in parents after an affected child is diagnosed.
A genetic result is only one part of your health story
A genetic result can provide useful insight, though how much it reveals depends on the condition and the kind of variant involved. Over time, many factors shape how the body works, including lifestyle, environment, age, and medical history. With some conditions, especially those shaped by many genes, genetic information provides context rather than certainty and is best considered alongside other parts of care. In other situations, a genetic result can offer a clear answer. In areas such as medication response, genetic results can also help put individual experiences into perspective.
Pharmacogenetics
How variants shape your response to medicine
Genetic variation can affect how your body responds to medicines. Some people break down a drug more slowly or more quickly than others, which can change how well it works or how likely side effects are. These differences are common and are one reason the same treatment can feel helpful for one person but less effective or harder to tolerate for another.
What is Pharmacogenetics?
Pharmacogenetics examines how differences in a person’s genes can affect their response to medications. It studies gene drug patterns to help explain why the same treatment may work differently from one person to another. For many medicines, genes can influence how powerfully a drug works or how the body handles it. This information can support treatment decisions that are more informed and more individualized. To look into this subject more deeply, more information is available in the LearnHub.
Drugs influenced by the GATB 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 symptoms, treatment, or side effects from medicines are best discussed with your doctor.