The WAC gene helps cells control which genes are turned on, manage stress, and clear away damaged cell material. If the WAC gene does not work properly, brain development and growth can be affected. Some people with a disruptive variant in this gene have developmental delay, speech and learning differences, low muscle tone, or behavior features such as autism or attention difficulties. Certain variants in the WAC gene can cause DeSanto-Shinawi syndrome.
What is a gene?
Genes are sections of DNA that carry instructions your cells use to make molecules or regulate processes in the body. Some genes provide the instructions for proteins, the parts of cells that do much of the work. Others mainly guide when certain processes take place, where they occur, and how strongly they operate. As a group, genes affect how the body develops and functions, 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
WACGene function
What if the gene works
The WAC gene helps cells control which genes are active, recycle worn-out cell parts, and divide in an organized way. These jobs support normal brain development and everyday cell function.
Risk
What if the gene does not work
Variants in the WAC gene are linked to a neurodevelopmental condition with developmental delay, intellectual disability, and behavior or feeding differences. Effects can range from milder to more marked, and more disruptive variants often cause earlier or broader features.
Treatment
What does that mean for your treatment
No WAC-specific treatment or drug selection approach is currently established. Care is guided by a person’s symptoms and needs rather than by a pathogenic variant in the WAC gene.
Conditions associated with WAC
Gene function
What if the gene works
Your cells use the WAC gene for steady daily housekeeping. It helps turn on selected genes, keeps active stretches of DNA easier to read, and supports the cell recycling process. Understanding how the WAC gene works helps explain how cells stay organized and keep making the proteins they need.
The WAC gene helps your cells switch on selected genes when they are needed. It supports the machinery that copies DNA instructions into RNA messages, which are then used to make proteins.
WAC also helps place a small chemical tag on the spool-like proteins that DNA wraps around. This keeps some active parts of DNA easier for the cell to reach and read.
WAC helps start autophagy (the cell's recycling system). This process breaks down worn-out cell parts so their building blocks can be reused.
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 differences 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. Sometimes, though, a variant changes how a gene works more substantially and can contribute to or cause a genetic condition.
Genetic variants
What if the gene does not work
Many variants in the WAC gene reduce how much working WAC protein a cell can make. More disruptive changes, such as early stop variants or small insertions or deletions that throw the code off track, often lead to a shortened protein or cause the message to be broken down before protein is made. In studies of how WAC gene variants affect protein function, some missense variants mainly weaken protein stability or interactions, while milder changes may leave partial activity.
How variants are linked to conditions
Pathogenic variants in the WAC gene cause DeSanto-Shinawi syndrome, a genetic condition linked with developmental delay, intellectual disability, and often autism features. Many people also have low muscle tone, feeding or sleep difficulties, or recognizable facial features. A pathogenic variant in the WAC gene can confirm the diagnosis when these features are present, although the exact pattern and severity can vary from person to person.
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 represent natural human diversity. For many genes, carrying a variant associated with a condition suggests a possible link rather than a definite diagnosis, especially when several genes and environmental factors also contribute. In some situations, though, a single well-characterized variant in a specific gene can be 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 WAC gene. For many living with a disease-causing WAC change, the main driver is the genetic change itself, so care usually centers on follow-up, developmental support, and watching for related health needs.
Inheritance of WAC variants
WAC-related conditions are inherited in an autosomal dominant pattern, which means a child only needs one altered copy of the WAC gene to inherit the condition. If a parent carries a disease-causing variant in the WAC gene, each child has a 50% chance of inheriting it. In many families, the change appears for the first time in the affected person as a new, de novo variant rather than being passed down from either parent. This is the main pattern described for how WAC gene variants are inherited.
What does my WAC result mean for my family?
For WAC-related DeSanto-Shinawi syndrome, the family meaning is usually in the autosomal dominant range: close relatives such as a parent, brother, sister, or child may also carry the same change and could consider genetic testing. Many reported cases happen for the first time in the affected child, so a parent may not have the variant. If a parent does carry it, each child has a 1 in 2, or 50%, chance of inheriting it.
Genetic information
Genetic testing
How you find out about variants
To look for a variant in the WAC gene, doctors use genetic testing for WAC gene variants, usually from a blood or saliva sample. A lab reads the DNA sequence and checks for changes, often through a multigene panel or broader DNA sequencing. Results may show a pathogenic variant, a benign variant, or a variant of uncertain significance.
When should I consider getting a genetic test?
Genetic testing for the WAC gene may be worth considering when a child has unexplained developmental delay, speech delay, learning problems, autism traits, or low muscle tone, especially along with similar features in relatives. It can also help explain a rare condition linked to WAC and clarify recurrence risk for future pregnancies.
A genetic result is only one part of your health story
Genetic results can be informative, but how much they reveal varies with the condition and the kind of variant involved. Over time, the way the body works is also shaped by many factors, 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 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. Small differences in genes 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 treatment works well for one person, works less well for another, or causes more side effects in some people.
What is Pharmacogenetics?
Pharmacogenetics examines how genetic differences can shape the way a person responds to medications. It studies links 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 handles it. This information can support more informed and individualized treatment decisions. You can read more about this topic in the LearnHub.
Drugs influenced by the WAC gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in guiding medication choices, so questions about side effects, new symptoms, or how medicines may affect you are best discussed with your doctor.
History
Researchers first described the WAC gene in the early 2000s during studies of how cells control gene activity and respond to DNA damage. From these first observations, research expanded steadily. A major step came in 2015, when independent groups linked harmful variants in the WAC gene to a developmental condition now called DeSanto-Shinawi syndrome. That discovery gave clinicians a clearer explanation for a pattern of developmental delay, learning differences, and growth features seen in some children. Since then, case reports and larger genetic studies have helped refine the picture and shown that people with variants in the WAC gene can have a wide range of features.