The DNAJC19 gene helps mitochondria, the parts of cells that make energy, work properly. If this gene does not work well, cells may struggle to make enough energy, especially in the heart, muscles, and other high need tissues. Pathogenic variants in the DNAJC19 gene can cause DCMA syndrome, a rare inherited condition linked to heart muscle disease, growth problems, movement differences, and developmental delay. Symptoms and severity can vary from person to person.
What is a gene?
Genes are stretches of DNA that carry instructions your cells use to make molecules or manage activities in the body. Some genes provide the directions for producing proteins, which do much of the cell’s work. Others mainly regulate when certain processes happen, where they take place, and how active they are. Taken together, genes affect how the body develops and functions, and they can influence how you respond to food, stress, and medications. More detail is available in the LearnHub.
Overview
DNAJC19Gene function
What if the gene works
The DNAJC19 gene helps mitochondria, the parts of cells that make energy, bring in and handle proteins they need to work well. This supports energy production, especially in the heart, muscles, and other tissues that use a lot of energy.
Risk
What if the gene does not work
Variants in the DNAJC19 gene can cause a condition with heart muscle weakness, movement and balance problems, and growth delay. Effects range from milder to more severe, which can influence when symptoms start and which features appear.
Treatment
What does that mean for your treatment
No DNAJC19-specific treatment or drug selection approach is currently established. Care is based on the person’s symptoms and may include standard treatment for heart weakness, heart rhythm problems, and related complications.
Conditions associated with DNAJC19
Gene function
What if the gene works
Your cells need the DNAJC19 gene to keep mitochondria running smoothly. Mitochondria are the parts of cells that make most of your usable energy. This gene helps these structures receive key proteins and stay organized for daily cell work.
The DNAJC19 gene helps move newly made proteins into mitochondria, the parts of cells that make energy. It works with import helpers at the inner mitochondrial membrane, the inner layer inside mitochondria, so proteins can reach the right place.
DNAJC19 also supports the organization of the inner mitochondrial membrane, where many energy related proteins do their work. This helps mitochondria stay orderly so routine energy production can run smoothly.
Many cell activities depend on mitochondria being stocked with the right proteins at the right time. By supporting this setup, the DNAJC19 gene helps cells meet everyday energy needs across the body.
What is a variant?
A genetic variant is a minor change in the DNA sequence within 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 have no noticeable effect and simply represent natural genetic variation. In some cases, though, a variant can more substantially change how a gene works and may contribute to or cause a genetic condition.
Genetic variants
What if the gene does not work
Variants in the DNAJC19 gene affect mitochondrial function by reducing how much protein the cell makes or by producing an unstable protein that cannot support protein handling and inner membrane structure. Milder changes may leave some activity, while more disruptive variants can cause near-complete loss of function and a larger drop in cellular energy production. In people with DCMA syndrome, less remaining function often lines up with earlier or broader features.
How variants are linked to conditions
Pathogenic variants in the DNAJC19 gene cause dilated cardiomyopathy with ataxia syndrome, often called DCMA. This rare inherited condition can involve an enlarged or weakened heart muscle, movement and balance problems, slower growth, and developmental differences. The same condition has also been referred to as 3-methylglutaconic aciduria type V. DNAJC19-related DCMA has been reported most often in people of Hutterite ancestry, though it can occur in others as well.
A variant is not necessarily a diagnosis
Genetic variants are a usual part of being human and are widely found across the general population. Most do not directly affect health and instead reflect normal human variation. For many genes, having a variant associated with a condition points to a possible link rather than a certain diagnosis, particularly when several genes and environmental influences play a role. In some situations, though, one well understood variant in a particular gene is enough to establish a diagnosis.
Are there things that can increase or change my risk?
For DNAJC19, risk is mainly shaped by whether someone is born with harmful changes in both copies of the gene. There is not yet broadly confirmed evidence that lifestyle or environmental factors meaningfully increase or lower risk related to DNAJC19.
Inheritance of DNAJC19 variants
DNAJC19-related conditions are inherited in an autosomal recessive pattern. For families asking about inheritance of the DNAJC19 gene variants, this usually means a child inherits one altered copy from each parent; the parents are often healthy carriers. When both parents carry a DNAJC19 variant, each pregnancy has a 25% chance of the child having the condition, a 50% chance of the child being a carrier, and a 25% chance of inheriting neither variant. Because the DNAJC19 gene is on an autosome, this pattern is the same for boys and girls.
What does my DNAJC19 result mean for my family?
For families with a DNAJC19-related condition, close relatives may also carry the changed gene. Brothers and sisters could be affected or could be carriers, even if they feel well, and parents are usually carriers. Other relatives on both sides of the family may also carry the same change, so the result can matter beyond just one person.
Genetic information
Genetic testing
How you find out about variants
To find out whether you carry a variant in the DNAJC19 gene, a lab can analyze DNA from a blood sample, saliva, or cheek swab. Genetic testing for DNAJC19 variants usually uses gene sequencing, sometimes as part of a heart or mitochondrial condition panel, and results may show a disease-causing variant, a benign finding, or a variant of uncertain significance.
When should I consider getting a genetic test?
Genetic testing for the DNAJC19 gene may be considered when a baby or child has an enlarged, weakened heart, heart-rhythm problems, movement or balance difficulties, or a family history of this rare inherited condition. It can also help clarify risk for relatives when a known DNAJC19 variant is already present in the family.
A genetic result is only one part of your health story
A genetic result can provide useful insight, but how much it reveals varies by the condition and the type of variant. Lifestyle, environment, age, and medical history, among other factors, also influence how the body functions over time. For some conditions, especially those shaped by many genes, genetic information offers context rather than certainty and is best considered 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 your body handles medicines, so the same treatment may work differently from one person to another. Some people break down a drug more slowly or more quickly, which changes how much medicine stays in the body. This can influence how well a treatment works or how sensitive someone is to side effects. These differences are common and are one reason medication response is not the same for everyone.
What is Pharmacogenetics?
Pharmacogenetics is the area of medicine that examines how genetic differences affect the way people respond to medications. It studies the relationship between genes and drugs to better understand why the same treatment can work differently from one person to another. For many medicines, genes can influence how strongly a drug works or how the body handles it. This understanding can support more informed, more individualized treatment decisions. You can read more about this topic in the LearnHub.
Drugs influenced by the DNAJC19 gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in guiding medication choice or dose, so any concerns about side effects, poor treatment response, or new symptoms while taking medicine are best discussed with your doctor.
History
The history of the DNAJC19 gene is closely tied to a rare inherited condition first recognized in the Hutterite population of western Canada. In the 1980s and 1990s, clinicians described children and young adults with a shared pattern of heart muscle disease, movement problems, and growth concerns, later called dilated cardiomyopathy with ataxia syndrome. Initially understood only through visible traits, later recognized as tied to a specific gene, this condition gave researchers a clearer path to study the DNAJC19 gene. In the mid 2000s, genetic studies identified DNAJC19 as the cause in affected families. Those findings turned a puzzling community pattern into a defined genetic diagnosis and shaped later research on this rare syndrome.