The protein made by the SASS6 gene helps cells build centrioles, tiny structures that organize cell division. If this gene does not work as expected, cells may divide abnormally during early development, which can lead to a smaller than expected head size because the brain does not grow in the usual way. Some people with SASS6 variants may also have developmental delay. These variants are uncommon and usually need to be inherited from both parents to cause the condition.
What is a gene?
Genes are stretches of DNA that hold instructions your cells use to make molecules or manage processes in the body. Some genes carry the directions for making proteins, which are the parts of cells that do the work. Other genes mainly regulate when certain processes happen, where they happen, and how strongly they operate. Together, genes affect how the body develops and works, and they can shape how you respond to food, stress, or medications. To explore this topic in greater depth, you can read more in the LearnHub.
Overview
SASS6Gene function
What if the gene works
The SASS6 gene helps cells build centrioles, tiny structures needed to organize cell division. This supports normal growth and helps some cells form cilia, the hairlike projections that move fluid or sense signals.
Risk
What if the gene does not work
More disruptive variants in the SASS6 gene can cause primary microcephaly, with a head and brain that are smaller than expected from birth. Effects can range from milder learning difficulties to more marked developmental delay.
Treatment
What does that mean for your treatment
No treatment or management approach specific to pathogenic or loss-of-function variants in the SASS6 gene is currently established. Care is based on the person's symptoms and developmental needs rather than the gene result itself. The SASS6 gene is being studied in cell growth and cancer research, but this has not led to a gene-directed treatment in clinical care.
Conditions associated with SASS6
Gene function
What if the gene works
Your cells rely on the SASS6 gene to build centrioles, tiny structures that help organize cell division and form cilia. Its protein acts early, giving a new centriole its starting framework. This background helps explain how the SASS6 gene helps cells divide in an orderly way and maintain important cell structures.
The SASS6 gene helps cells start building a new centriole. Its protein forms an early framework that other centriole proteins can build on.
The SASS6 protein helps set the usual nine part layout of a centriole. This balanced pattern gives the structure its stable, organized shape.
Centrioles help organize the spindle, a set of fibers that moves chromosomes during cell division. By supporting centriole formation, the SASS6 gene helps cells prepare for accurate chromosome separation.
Some centrioles later serve as the base for cilia, tiny hairlike structures on cells. By helping build centrioles, the SASS6 gene supports this starting point for cilia formation.
What is a variant?
A genetic variant is a small alteration in the DNA sequence of a gene. These changes are common and are part of normal human diversity, such as differences in appearance, metabolism, or how the body responds to environmental influences. Many variants have no noticeable effect and simply represent natural genetic variation. In some cases, however, a variant can change the function of a gene more significantly and may contribute to, or sometimes cause, a genetic condition.
Genetic variants
What if the gene does not work
Variants in the SASS6 gene can change the shape, stability, or amount of the SASS6 protein, which helps cells build centrioles needed for orderly cell division. This is how variants influence the SASS6 gene's function: milder missense variants may leave some activity, while more severe truncating or splice variants can leave little or no working protein. Greater loss of SASS6 function makes centriole assembly less reliable and is linked to earlier or more marked features in SASS6-related primary microcephaly.
How variants are linked to conditions
Pathogenic variants in the SASS6 gene cause a rare inherited form of primary microcephaly, a condition in which a baby’s head and brain are smaller than expected from birth. In reports of SASS6 gene variants linked to primary microcephaly, some children also have developmental delay or intellectual disability. This usually happens when both copies of the SASS6 gene carry a pathogenic variant.
A variant is not necessarily a diagnosis
Genetic variants are a usual part of human biology and are common across the general population. Most of these variants do not have a direct effect on health and instead 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 several genes and environmental factors play a role. 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 SASS6, risk is mainly shaped by family inheritance rather than day-to-day habits or environment. A child’s chance of being born with a SASS6-related condition is higher when both biological parents carry a harmful change in the SASS6 gene, including in families where parents are related by blood.
Inheritance of SASS6 variants
For families asking about SASS6 gene inheritance, the best-established pattern is autosomal recessive. This means a child usually inherits one SASS6 gene variant from each parent, and the parents are often healthy carriers. When both parents carry a variant in the SASS6 gene, each pregnancy has a 25% chance of an affected child, a 50% chance of a child who is also a carrier, and a 25% chance of a child with neither familial variant. Sons and daughters are affected at the same rate.
What does my SASS6 result mean for my family?
Changes in the SASS6 gene have been linked to a rare inherited condition that affects brain growth, usually passed down in a recessive pattern. For families, this often means parents can carry the gene change without having symptoms, and brothers, sisters, or future children may also be carriers or be affected. Close relatives may want to learn whether the same gene change is present in the family.
Genetic information
Genetic testing
How you find out about variants
SASS6 genetic testing usually uses a blood or saliva sample to read the SASS6 gene for variants. It may be done through a targeted gene panel or through broader exome or genome sequencing. Results can show a variant linked to the condition, an uncertain finding, or no relevant change.
When should I consider getting a genetic test?
Genetic testing for the SASS6 gene may be considered when a baby or child has a much smaller-than-expected head size from before birth or early infancy, especially with developmental delays. It can also be helpful if this pattern runs in the family or if related parents have had an affected child.
A genetic result is only one part of your health story
Genetic test results can provide useful insight, but how much they explain varies by the condition and the kind of variant involved. Many 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 offers context rather than certainty and is best understood together with other parts of care. In other situations, a genetic result may give 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. Some people break down a drug more slowly or more quickly, while others may be more or less sensitive to its effects. This helps explain why the same treatment works well for one person but causes fewer benefits or more side effects in another. These differences are common and are one part of how clinicians understand medication response.
What is Pharmacogenetics?
Pharmacogenetics examines how inherited genetic differences shape the way people respond to medicines. It studies links between genes and medications to clarify why the same treatment can work differently from one person to another. For many drugs, genes affect both how strongly a medicine works and how the body handles it. This information can support more informed, more personalized treatment decisions. More detail on this topic is available in the LearnHub.
Drugs influenced by the SASS6 gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in how medicines work, so any concerns about symptoms, treatment choices, or side effects are best discussed with your doctor or pharmacist.
History
In recent decades, awareness of the SASS6 gene’s role has grown through research on how cells organize their internal structures during division. It was identified as part of a group of genes involved in building centrioles, the tiny structures that help cells separate their chromosomes correctly. Building on this early work, scientists showed that the SASS6 gene is central to forming the “cartwheel,” an early scaffold that gives a new centriole its shape. Studies in yeast, flies, and human cells helped confirm that this process is highly conserved across species. Later, researchers connected harmful variants in the SASS6 gene with some inherited conditions affecting brain growth, which expanded its importance from basic cell biology to medical genetics.