The PROM1 gene helps certain cells keep their outer shape, especially the light sensing cells in the retina at the back of the eye. If it does not work properly, these cells can wear down over time, which may lead to blurred central vision, trouble seeing at night, blind spots, or gradual vision loss. This gene plays an important role in keeping the retina healthy, so some PROM1 variants are linked to inherited eye conditions such as cone rod dystrophy, retinitis pigmentosa, and macular disease.
What is a gene?
Genes are sections of DNA that hold instructions your cells use to make molecules or regulate processes in the body. Some genes carry the instructions for producing proteins, which are the working parts of cells. Others mainly help determine when certain processes happen, where they happen, and how strongly they run. Taken together, genes affect how the body develops and works, and they can influence how you respond to food, stress, and medications. More information on this topic is available in the LearnHub.
Overview
PROM1Gene function
What if the gene works
The PROM1 gene helps certain cells keep their shape and organized outer surface. It is especially important in the light sensing cells of the retina, where it supports normal vision.
Risk
What if the gene does not work
Variants in the PROM1 gene most often affect the retina, causing inherited vision loss such as cone-rod dystrophy, retinitis pigmentosa, or macular disease. Effects can range from milder adult-onset blurring to earlier, broader sight loss with more disruptive variants.
Treatment
What does that mean for your treatment
No treatment or drug choice based specifically on the PROM1 gene is currently established in clinical guidelines. The PROM1 gene is being studied in inherited retinal disease research, including gene-based approaches, but this has not yet led to routine treatment decisions.
Conditions associated with PROM1
Gene function
What if the gene works
Cells use the PROM1 gene to organize their outer surface and keep certain delicate structures in shape. This matters most in cells with tiny projections, where the membrane needs careful support. Understanding what the PROM1 gene does in the body helps explain how cells maintain orderly surfaces during everyday renewal.
The protein made from the PROM1 gene helps cells build and maintain tiny outward folds on their surface. These folds give the cell more working space and support normal shape.
This protein gathers in specific parts of the cell membrane. That pattern helps some cells keep an organized top and bottom surface, so key materials stay in the right place.
In the retina, the PROM1 gene helps light sensing cells form and renew their outer segments, the light catching part of the cell. This steady membrane shaping supports normal visual function.
What is a variant?
A genetic variant is a small difference in the DNA sequence within a gene. These differences are common and are part of 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 simply represent natural genetic variation. In some cases, 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
In discussions of how PROM1 gene variants affect protein function, the main issue is that changes can alter how the prominin-1 protein folds, reaches the cell surface, or helps organize the light sensing membranes of retinal cells. Milder variants may partly reduce protein stability or trafficking. More severe variants can greatly lower or abolish protein function, which may be linked to earlier or more pronounced inherited retinal disease. Some missense variants may also disrupt the normal protein made from the other gene copy.
How variants are linked to conditions
Pathogenic variants in the PROM1 gene can cause inherited retinal conditions, especially cone-rod dystrophy, retinitis pigmentosa, and some forms of Stargardt disease and macular dystrophy. These PROM1 gene retinal disease patterns can affect central vision, side vision, night vision, or all three, and the age they begin varies widely. Some variants are passed down in dominant families, while others follow a recessive pattern.
A variant is not necessarily a diagnosis
Genetic variants are a usual part of human biology and are widely seen in the general population. Most do not have a direct effect on health and simply represent natural human diversity. For many genes, carrying a variant associated with a condition points to a possible link rather than a definite diagnosis, especially when several genes and environmental factors are involved. In some situations, however, a single clearly characterized variant in a specific gene is enough to confirm a diagnosis.
Are there things that can increase or change my risk?
There isn't yet broadly confirmed evidence on specific factors that increase or reduce risk related to the PROM1 gene. For many living with a PROM1 change, the main risk is tied to the genetic variant itself rather than clear lifestyle factors. Anyone with concerns about personal or family risk should speak with a doctor or genetic counselor.
Inheritance of PROM1 variants
PROM1-related conditions can be inherited in different ways, so how PROM1 gene variants are inherited depends on the specific eye condition and the variant involved. Well-established patterns include autosomal dominant inheritance, where a parent carrying a PROM1 variant has a 50% chance of passing it to each child, and autosomal recessive inheritance, where a child inherits one variant from each parent. In recessive families, parents are often healthy carriers. Because the PROM1 gene is on chromosome 4, an autosome, inheritance is generally the same for males and females.
What does my PROM1 result mean for my family?
A PROM1 result can matter for relatives, but the meaning depends on the specific PROM1-related eye condition in the family. Some PROM1 changes are passed down in a dominant way, so close relatives such as a parent, sibling, or child may also carry the change. Other PROM1-related conditions are recessive, which means relatives may be healthy carriers and, in some families, affected children can be born when both parents carry a changed copy.
Genetic information
Genetic testing
How you find out about variants
Genetic testing for PROM1 variants usually uses a blood or saliva sample. A lab reads the DNA in the PROM1 gene and compares it with the usual sequence to find variants. Results can help clarify whether a DNA change may be linked to an inherited eye condition and whether it may run in a family.
When should I consider getting a genetic test?
Genetic testing for the PROM1 gene may be worth considering if you or close relatives have an inherited eye condition, especially worsening central vision, trouble seeing at night, or a diagnosis such as cone-rod dystrophy, retinitis pigmentosa, or Stargardt-like macular disease. It can help clarify the cause and whether the condition may run 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 explains depends on the condition and the type of variant involved. Lifestyle, environment, age, and medical history all 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 most useful when considered alongside other parts of care. In other situations, a genetic result may give a clear answer. In areas like medication response, genetic results can help put personal experiences into perspective.
Pharmacogenetics
How variants shape your response to medicine
Genetic variation can affect how people respond to medicines. One person may break down a drug more slowly or more quickly than another, which can change how strongly it works or how likely side effects are. These differences are common and are one reason the same treatment can help one person a lot, help another person less, or feel harder to tolerate.
What is Pharmacogenetics?
Pharmacogenetics is the area of study that examines how genetic differences affect medication response. It looks at relationships between genes and drugs to help explain why the same treatment may work differently from one person to another. For many medicines, genes can influence both how strongly a drug works and how the body processes it. This understanding can help support treatment decisions that are more informed and more individualized. To explore this topic in greater detail, you can learn more in the LearnHub.
Drugs influenced by the PROM1 gene
When should I seek medical advice?
There is no broadly confirmed role for this gene in guiding how medicines are chosen or adjusted, so any concerns about your health, treatment, or medication side effects are best discussed with your doctor.
History
The PROM1 gene entered medical research through work on a cell surface protein later called CD133, first described in the 1990s. Researchers initially studied it in blood forming cells and then recognized it in the retina and other tissues, which expanded interest beyond hematology. In recent decades, awareness of this gene’s role has grown because PROM1 variants were linked to inherited retinal conditions in families with vision loss. That connection helped move the gene from laboratory marker research into clinical genetics. Building on this early work, scientists also explored PROM1 in stem cell biology and cancer research, where CD133 became widely used in experiments. These historical steps shaped today’s understanding.