The DPH5 gene helps cells finish a small chemical change on a protein called eEF2, which is needed for accurate protein building. If this gene does not work properly, cells may make proteins less reliably, which can affect brain development and growth. People with harmful variants in the DPH5 gene can have a rare inherited condition with developmental delay, low muscle tone, seizures, and learning difficulties, although features can vary from person to person.
What is a gene?
Genes are sections of DNA that carry instructions your cells use to make molecules or manage processes in the body. Some genes hold the instructions for making proteins, the parts of cells that do much of the work. Other genes mainly help regulate when certain processes happen, where they take place, and how strongly they operate. Together, genes affect how the body develops and works, and they can also influence how you respond to food, stress, or medications. To explore this topic in greater depth, you can learn more in the LearnHub.
Overview
DPH5Gene function
What if the gene works
The DPH5 gene helps cells add a small chemical mark to a protein used in making other proteins. This supports normal protein production, which cells need for growth, repair, and everyday function.
Risk
What if the gene does not work
Changes that greatly reduce how well the DPH5 gene works are linked to developmental delay, learning difficulties, growth differences, and sometimes seizures. Milder and more severe variants can influence when symptoms start and how strongly a person is affected.
Treatment
What does that mean for your treatment
For a pathogenic or loss-of-function variant in the DPH5 gene, no DPH5-specific treatment or drug-selection approach is currently established. Care is based on the person’s symptoms and day-to-day needs rather than the variant itself.
Gene function
What if the gene works
Inside your cells, the DPH5 gene helps build a small chemical tag on EEF2, a protein used during protein making. This tag, called diphthamide, supports accurate translation, the step where cells read genetic instructions and turn them into proteins. Understanding what the DPH5 gene does in your cells helps explain how routine cell work stays organized.
The DPH5 gene adds small chemical groups called methyl groups to an early diphthamide building block on EEF2, a protein used during protein making. This key middle step moves the tag closer to its final form.
By helping create diphthamide on EEF2, the DPH5 gene supports accurate translation, the process cells use to build proteins from genetic instructions. This helps ribosomes stay on track as they make proteins needed for everyday cell activity.
What is a variant?
A genetic variant is a small difference in the DNA sequence of a gene. These differences are common and help shape normal human diversity, including variation in appearance, metabolism, and how the body responds to environmental influences. Many variants do not have any noticeable effect and are simply part of natural genetic variation. In some cases, though, a variant can change how a gene works more substantially and may contribute to or cause a genetic condition.
Genetic variants
What if the gene does not work
In discussions of how DPH5 gene variants affect protein function, the main issue is a reduced ability to place a small chemical tag on eEF2, a protein cells use to make other proteins. Some variants change the DPH5 protein's shape, making it less stable or less able to bind ATP, the cell's energy source, or its target. Milder variants may leave some activity, while more severe variants can lead to very little or no enzyme activity.
How variants are linked to conditions
Pathogenic variants in the DPH5 gene are linked to a rare inherited condition often called diphthamide deficiency syndrome 5, one of the main conditions linked to DPH5 gene variants. People with this diagnosis may have developmental delay, intellectual disability, short stature, seizures, and sometimes distinctive facial features or brain imaging findings. When disease-causing variants are found in both copies of the DPH5 gene, this can confirm the diagnosis.
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 have a direct effect on health and instead represent natural human variation. For many genes, carrying a variant associated with a condition indicates 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 specific gene is 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 DPH5 gene. For many living with a disease-causing change in DPH5, the main driver is the genetic change itself, and a doctor or genetic counselor can help explain what that may mean for personal risk.
Inheritance of DPH5 variants
DPH5-related conditions are inherited in an autosomal recessive pattern. This means a person usually develops the condition only when both copies of the DPH5 gene carry a disease-causing variant, with one variant inherited from each parent. Parents who each carry one DPH5 variant are typically unaffected carriers, and 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 with two working copies. In families asking how DPH5 variants are inherited, this pattern means boys and girls are affected equally.
What does my DPH5 result mean for my family?
For DPH5, family meaning usually follows a recessive pattern. This often means parents are healthy carriers, and brothers or sisters may also be affected or be carriers even if they seem well. Other close relatives may also carry the same gene change, so family testing may be relevant depending on the result seen in your family.
Genetic information
Genetic testing
How you find out about variants
DPH5 gene testing looks for variants in a blood, saliva, or cheek swab sample using DNA sequencing. If you are looking into how to find DPH5 gene variants, the test reads the gene's code and compares it with a reference sequence. Results may show a variant linked to a condition, a likely benign change, or a result that remains uncertain.
When should I consider getting a genetic test?
There may be a reason to look for changes in the DPH5 gene as part of broader genetic testing in a child with unexplained developmental delay, learning problems, or other early growth and health concerns. Testing decisions are best made with a doctor or genetic counselor based on personal and family history.
A genetic result is only one part of your health story
A genetic result can provide valuable insight, but how much it can explain depends on the condition and the type of variant involved. Over time, factors such as lifestyle, environment, age, and medical history also influence how the body functions. In some conditions, especially those affected by many genes, genetic information provides context rather than certainty and is most useful when considered with other parts of care. In other situations, a genetic result may offer 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 DNA can change how the body breaks down a drug, moves it through the bloodstream, or responds to it at its target. This helps explain why the same treatment may work well for one person, have less effect in another, or cause more side effects in someone who is more sensitive to it.
What is Pharmacogenetics?
Pharmacogenetics examines how differences in genes can shape a person’s response to medications. It looks at the links between genes and drugs to better explain why the same treatment may work differently from one person to another. For many medicines, genes can affect both how strongly a drug works and how the body handles it. This information can help support treatment decisions that are more informed and more individualized. To explore this subject in greater detail, you can learn more in the LearnHub.
Drugs influenced by the DPH5 gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in predicting how people respond to medicines, so general questions about side effects, new symptoms, or medication changes are best discussed with your doctor or pharmacist.