The MAK gene helps keep the retina’s light-sensing cells working, especially the tiny structures they use to move and recycle key materials. This gene plays an important role in maintaining these cells, so when both copies carry harmful variants, the cells can gradually wear down. People who inherit harmful variants in both copies of the MAK gene often first notice trouble seeing in dim light, followed by a narrowing of side vision over time. In medicine, the MAK gene is best known as a cause of an inherited form of retinitis pigmentosa, particularly in some Ashkenazi Jewish families.
What is a gene?
Genes are stretches of DNA that give cells instructions to make molecules or to regulate activities in the body. Some genes carry the code for proteins, which are the parts of cells that do much of the work. Others mainly direct when, where, and how much certain processes happen. Taken together, genes help shape how the body develops and functions, and they can influence how you respond to food, stress, and medications. For a deeper look at this topic, visit the LearnHub.
Overview
MAKGene function
What if the gene works
The MAK gene helps make a protein that supports the retina, the part of the eye that senses light. It helps control tiny cell projections called cilia, which move materials needed for normal vision.
Risk
What if the gene does not work
Variants in the MAK gene can cause inherited retinal degeneration, usually retinitis pigmentosa, with night blindness and gradually narrowing side vision. Milder and more severe variants can influence when vision changes begin and how much sight is affected over time.
Treatment
What does that mean for your treatment
For people with a pathogenic or loss-of-function variant in the MAK gene, no MAK-specific treatment or drug choice is currently established in clinical guidelines. The MAK gene is being studied in inherited retinal disease research, including gene replacement approaches, but this has not yet changed routine treatment.
Conditions associated with MAK
Gene function
What if the gene works
For clear vision and steady cell upkeep, your body relies on the MAK gene in a few specialized ways. It is especially active in cilia, which are tiny hair-like structures that help cells move materials and sense their surroundings. Understanding what the MAK gene does in the retina helps show how light-sensing cells stay organized over time.
The MAK gene helps cells manage the length and shape of cilia, which are tiny hair-like structures on the cell surface. This supports orderly movement of proteins inside the cilium and steady cell signaling.
In light-sensing cells of the retina, the MAK gene helps maintain the long outer segment that captures light. This explains an important part of what the MAK gene does in the retina during everyday vision.
Inside some cells, activity from the MAK gene helps coordinate parts of the cell cycle, the step-by-step process cells use to prepare for division. This supports orderly growth and routine tissue renewal.
What is a variant?
A genetic variant is a minor change in the DNA sequence of a gene. These changes are common and are part of normal human diversity, including differences in appearance, metabolism, and how the body responds to environmental influences. Many variants do not have any noticeable effect and simply reflect natural genetic variation. Sometimes, 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
Variants in the MAK gene can change the protein’s shape, shorten it, or stop cells from making enough of it. Many pathogenic variants reduce kinase activity or disrupt the protein’s placement in the photoreceptor cilium, a tiny transport bridge inside light sensing eye cells. This shows how MAK gene variants affect protein function, with milder variants sometimes leaving partial activity and more severe loss of function often linked to earlier or more marked retinal disease.
How variants are linked to conditions
Pathogenic variants in the MAK gene are a well-established cause of autosomal recessive retinitis pigmentosa, an inherited eye condition that gradually narrows side vision and can make night driving or moving around in dim light harder. A diagnosis usually requires disease-causing variants in both copies of the MAK gene. This form of inherited retinal disease is often described as retinitis pigmentosa caused by variants in the MAK gene.
A variant is not necessarily a diagnosis
Gene variants are a normal feature of human biology and are common throughout the general population. Most do not have a direct effect on health and simply reflect natural human diversity. For many genes, carrying a variant associated with a condition suggests a possible link rather than a definite diagnosis, especially when multiple genes and environmental factors also play a part. 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?
For MAK, risk is mainly shaped by genetics: people who inherit two changed copies can develop an inherited eye condition called retinitis pigmentosa. Family history and having Ashkenazi Jewish ancestry can raise the chance of carrying a MAK change. There is not enough evidence to say that lifestyle changes lower this inherited genetic risk.
Inheritance of MAK variants
For families asking how variants of the MAK gene are inherited, the best-established pattern is autosomal recessive. This means a person usually develops a MAK-related condition only when they inherit one altered copy from each parent, while parents with one altered copy are typically healthy carriers. When both parents carry a variant in the MAK gene, each pregnancy has a 25% chance of being affected, a 50% chance of resulting in a carrier child, and a 25% chance of inheriting neither variant. Because the MAK gene is on an autosome rather than a sex chromosome, this pattern is the same for males and females.
What does my MAK result mean for my family?
Changes in the MAK gene are usually linked to an inherited eye condition that runs in families in a recessive pattern. This often means parents, brothers, sisters, and adult children could be carriers, and in some families more than one relative may be affected. For relatives, the main question is often whether they also carry the same MAK change, especially if there is a family history of vision loss.
Genetic information
Genetic testing
How you find out about variants
To find out whether you carry a variant in the MAK gene, doctors use MAK gene genetic testing on a blood or saliva sample. The lab reads the DNA sequence, often with a retinal disease panel or full sequencing, and compares it with the usual sequence to identify variants.
When should I consider getting a genetic test?
Consider testing the MAK gene if you or a close relative has inherited retinal disease, especially night blindness, tunnel vision, or retinitis pigmentosa. It can be particularly relevant in people of Ashkenazi Jewish ancestry, where certain MAK changes are more common. A result may help confirm the cause and clarify family risk.
A genetic result is only one part of your health story
A genetic finding can provide useful information, but how much it explains depends on the condition and the type of variant involved. Many other factors also shape how the body works over time, including lifestyle, environment, age, and medical history. For some conditions, especially those influenced by many genes, genetic information provides context rather than certainty and is most useful when considered alongside other parts of care. In other situations, a genetic finding may offer a clear answer. In areas such as medication response, genetic results can 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 a person’s DNA can change how the body breaks down a drug, moves it through the body, or responds to it at its target. This helps explain why the same medication works well for one person, works less well for another, or causes more side effects in someone else. These differences are common and can influence both how effective a treatment is and how sensitive a person may be to it.
What is Pharmacogenetics?
Pharmacogenetics looks at how genetic differences can shape a person’s response to medications. It examines links between genes and drugs to help explain why the same treatment can work differently from one person to another. For many medicines, genes can affect how strongly a drug works or how the body handles it. Understanding this can support more informed and personalized treatment decisions. More detail on this topic is available in the LearnHub.
Drugs influenced by the MAK gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in guiding medication choice or response, so any concerns about side effects, new symptoms, or how medicines may work for you are best discussed with your doctor.
History
In the early 1990s, researchers identified the MAK gene while studying a group of genes involved in cell signaling and cell division. Early work gave it the name male germ cell associated kinase because it was first described in testis tissue. From these first observations, research expanded steadily, and scientists later found that changes in the MAK gene could be linked to inherited retinal disease. A notable step came when a recurring MAK gene variant was recognized as a cause of retinitis pigmentosa in some people of Ashkenazi Jewish ancestry. Over time, this shifted the gene from a laboratory finding to a clinically recognized part of inherited eye disease research.