The DHCR24 gene helps your body make cholesterol, a substance needed for cell membranes, hormones, and normal brain development. When this gene does not work properly, desmosterol can build up and cholesterol can stay too low, which may lead to a rare inherited condition called desmosterolosis. People with harmful variants in the DHCR24 gene can have differences in growth, brain development, and body structure, although effects vary. This gene is mainly known in medicine rather than popular culture.
What is a gene?
A gene is a stretch of DNA that holds instructions your cells use to make molecules or manage processes in the body. Some genes carry the directions for producing proteins, the functional parts of cells. Others mainly help direct 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 influence how you respond to food, stress, or medications. For a deeper look at this topic, you can find more in the LearnHub.
Overview
DHCR24Gene function
What if the gene works
The DHCR24 gene helps your body make cholesterol, especially in the final step of this process. Cholesterol supports cell membranes, hormone production, and normal growth and development.
Risk
What if the gene does not work
When the DHCR24 gene works poorly, desmosterolosis can affect brain and body development. More severe variants often cause earlier, broader problems, including developmental delay, low muscle tone, growth problems, and limb or facial differences.
Treatment
What does that mean for your treatment
For a pathogenic variant in the DHCR24 gene, no DHCR24-specific treatment or drug-choice approach is currently established; care is supportive and guided by a person’s symptoms. The DHCR24 gene is also being studied as a possible biomarker and drug target in some cancers and brain conditions.
Conditions associated with DHCR24
Gene function
What if the gene works
Understanding what the DHCR24 gene does in the body starts with cholesterol, a fat-like substance your cells need every day. This gene helps finish one of the last steps in cholesterol production. That steady supply supports normal cell structure and communication across many tissues.
The DHCR24 gene helps your cells complete a final step in making cholesterol. Its protein turns desmosterol, a near-finished building block, into cholesterol.
Cholesterol made with help from the DHCR24 gene becomes part of cell membranes, the thin outer layer around each cell. This helps membranes keep the right balance of firmness and flexibility.
Well-built membranes help receptors and other cell parts stay in the right place. By supporting cholesterol supply, this gene helps cells send and receive routine signals.
What is a variant?
A genetic variant is a slight difference in the DNA sequence within a gene. These differences are common and help shape normal human diversity, including variation in appearance, metabolism, and the way the body responds to environmental influences. Many do not have any noticeable effect and are simply part of natural genetic variation. In some cases, though, a variant changes how a gene works more substantially and can contribute to or lead to a genetic condition.
Genetic variants
What if the gene does not work
Variants in the DHCR24 gene can change the shape or stability of its enzyme, so cells make less of it or a poorly working version. This may reduce the final step of cholesterol production and lead to a buildup of desmosterol, with the functional effects of DHCR24 gene variants ranging from mild reduction in activity to near complete loss. More disruptive variants often cause a larger biochemical block and, in desmosterolosis, can be linked to earlier and broader features.
How variants are linked to conditions
Pathogenic variants in the DHCR24 gene cause desmosterolosis, a very rare inherited condition. People with two disease-causing variants may have developmental delay, low muscle tone, short stature, feeding difficulties, vision problems such as cataracts, and differences seen on brain scans, although the pattern and severity can vary. In clinical genetics, the best-established DHCR24 gene variant and desmosterolosis link is this rare condition.
A variant is not necessarily a diagnosis
Gene variants are a normal feature of human biology and are common throughout the general population. Most have no direct effect on health and simply reflect natural human diversity. 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 particular gene can be enough to confirm a diagnosis.
Are there things that can increase or change my risk?
For DHCR24, risk is mainly shaped by inheritance rather than lifestyle. A child’s chance of having the related condition is higher when both parents carry a harmful change in the DHCR24 gene, and this is more likely in families where the parents are blood relatives.
Inheritance of DHCR24 variants
Variants in the DHCR24 gene linked to desmosterolosis are inherited in an autosomal recessive pattern, which means a child usually needs to inherit one altered copy from each parent. In families asking how DHCR24 gene variants are inherited, parents are often healthy carriers who each pass on one copy without having the condition themselves. When both parents carry a disease-causing variant in the DHCR24 gene, each pregnancy has a 25% chance of the child having the condition, a 50% chance of being a carrier, and a 25% chance of inheriting neither altered copy. Sons and daughters are affected equally.
What does my DHCR24 result mean for my family?
DHCR24 changes are linked to a rare inherited condition called desmosterolosis, which follows a recessive pattern. For family members, this usually means parents may be healthy carriers, and brothers or sisters could also be carriers or, less often, have the condition. Close relatives may want to learn whether the same gene change runs in the family, especially if there is a history of similar health or development concerns.
Genetic information
Genetic testing
How you find out about variants
To find out whether you carry a variant in the DHCR24 gene, doctors use DHCR24 genetic testing on a blood, saliva, or cheek-swab sample. A lab reads the gene’s DNA code and checks for changes that may help explain symptoms or confirm an inherited condition when the result matches the clinical picture.
When should I consider getting a genetic test?
Testing for the DHCR24 gene may be considered if a baby or child has signs of a very rare condition that affects how the body makes cholesterol and can cause growth, brain, or bone differences. It can also be helpful when there is a family history of this condition or blood tests show unusually high desmosterol levels.
A genetic result is only one part of your health story
A genetic result can provide useful insight, but how much it reveals varies based on the condition and the type of variant involved. Over time, many factors, including lifestyle, environment, age, and medical history, also influence how the body functions. For some conditions, especially those shaped by many genes, genetic information adds context rather than certainty and is most helpful when viewed alongside 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. A treatment that works well for one person may work less well for another, or may cause more side effects, because the body can absorb, break down, and handle drugs differently. These differences are common and are one reason medication response is not the same for everyone. In some cases, inherited gene changes can influence how strongly a medicine works or how sensitive someone is to it.
What is Pharmacogenetics?
Pharmacogenetics examines how genetic differences can shape a person’s response to medications. It studies the relationship between genes and drugs to help 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 processes it. This information can help support more informed and personalized treatment decisions. To explore this topic in greater detail, you can learn more in the LearnHub.
Drugs influenced by the DHCR24 gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in guiding medication choices. Questions about medicines, side effects, or other health concerns are best discussed with your doctor.
History
The DHCR24 gene entered research through cholesterol studies and later drew wider interest in brain health. In recent decades, awareness of this gene’s role has grown as scientists linked it to both inherited metabolic disease and age related research. It was first identified in work on desmosterol reductase, an enzyme involved in the final steps of making cholesterol, and pathogenic variants were later tied to desmosterolosis, a rare genetic condition. Around the same time, the gene was also described as SELADIN-1 in studies of Alzheimer disease, which brought it into a different area of medical research. Over time, scientists’ understanding of the gene’s function has changed, and those early lines of research together shaped how the DHCR24 gene is viewed today.