The SHOC1 gene helps egg and sperm cells go through meiosis, the special cell division that halves chromosome number and reshuffles DNA. This gene plays an important role in making sure chromosomes pair and exchange material in a controlled way. If the SHOC1 gene is not working properly, some people may make few or no healthy sperm or eggs, which can lead to reduced fertility or infertility. The SHOC1 gene is mainly known in genetics and fertility medicine rather than in popular culture.
What is a gene?
Genes are stretches of DNA that carry instructions your cells use to make molecules or to regulate processes in the body. Some genes hold the directions for producing proteins, the parts of cells that do the work. Other genes mainly help determine when certain processes happen, where they take place, and how strongly they operate. Taken together, genes affect how the body develops and functions, and they can influence how you respond to food, stress, or medications. For a more detailed look at this topic, you can find additional information in the LearnHub.
Overview
SHOC1Gene function
What if the gene works
The SHOC1 gene helps reproductive cells swap matching pieces of DNA during meiosis, the special cell division that makes eggs and sperm. This supports correct chromosome separation and fertility.
Risk
What if the gene does not work
Milder to more severe variants in the SHOC1 gene are linked to infertility, often causing little or no sperm in semen in males and reduced ovarian function or premature ovarian insufficiency in females.
Treatment
What does that mean for your treatment
For pathogenic variants in the SHOC1 gene, no SHOC1-specific treatment or drug selection approach is currently established in clinical guidelines.
Conditions associated with SHOC1
Gene function
What if the gene works
To make eggs and sperm, your cells need chromosome pairs to be handled in a very ordered way. A core part of SHOC1 gene function is supporting this special cell division, called meiosis. It helps matched chromosome pairs exchange DNA and stay organized as new reproductive cells form.
One of the main jobs of the SHOC1 gene is to help matched chromosome pairs swap small pieces of DNA during meiosis. This exchange, called a crossover, creates a physical link between the pairs and supports normal egg and sperm formation.
During meiosis, the SHOC1 gene helps paired chromosomes stay aligned while the DNA exchange process is being organized. This close pairing gives cells a steadier way to compare matching DNA and prepare the chromosomes for the next step.
By helping crossovers form, the SHOC1 gene supports the even separation of chromosome pairs into new cells. This is an important part of how the body makes reproductive cells with the right amount of DNA.
What is a variant?
A genetic variant is a minor difference in a gene’s DNA sequence. These differences are common and are part of normal human diversity, including variation in appearance, metabolism, and the way the body responds to environmental influences. Many variants do not have any noticeable effect and are simply part of natural genetic variation. Sometimes, though, a variant changes how a gene works more significantly and can contribute to or cause a genetic condition.
Genetic variants
What if the gene does not work
Variants in the SHOC1 gene can change the protein’s shape, stability, or amount, which may weaken the cell process that helps matched chromosomes exchange DNA during egg or sperm formation. Milder variants may leave some activity in place, while more severe variants, especially truncating or splice-altering changes, can greatly reduce or eliminate SHOC1 protein function. This helps explain how SHOC1 gene variants can affect fertility, with stronger functional loss often linked to a greater disruption of egg or sperm development.
How variants are linked to conditions
Variants in the SHOC1 gene do not yet have a broadly confirmed link to a specific health condition, although research on SHOC1 gene related conditions is still developing. If you have a confirmed SHOC1 variant on testing, your doctor or genetic counselor can explain what it may mean in the context of your personal and family history.
A variant is not necessarily a diagnosis
Genetic variants are common across the general population and are a normal feature of human biology. Most do not directly affect health and simply reflect natural differences among people. For many genes, having a variant associated with a condition points to a possible link rather than a certain diagnosis, particularly when more than one gene and environmental influences play a role. In some situations, though, one well-characterized variant in a particular gene is 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 SHOC1 gene. In families with a SHOC1 change linked to infertility, the main factor is whether someone inherited the gene change, while other influences are still being studied.
Inheritance of SHOC1 variants
SHOC1-related infertility is inherited in an autosomal recessive pattern. This means a person usually develops the condition only when they inherit two disease-causing variants in the SHOC1 gene, one from each parent. Parents who carry one variant are typically carriers and often do not have symptoms. When both parents are carriers, each pregnancy has a 25% chance of a child inheriting both variants, a 50% chance of being a carrier, and a 25% chance of inheriting neither variant. This is the main SHOC1 gene inheritance pattern described so far.
What does my SHOC1 result mean for my family?
For families, a SHOC1 result usually matters most for siblings and future children because SHOC1-related health effects have been linked to a recessive pattern. Brothers or sisters could also carry the same gene change, and in some families another relative may have similar fertility problems without knowing the cause. Children are usually only affected if both parents pass on a changed copy, so relatives may sometimes want to learn whether they are carriers.
Genetic information
Genetic testing
How you find out about variants
Genetic testing for SHOC1 variants uses a blood or saliva sample to read the SHOC1 gene and look for changes in its DNA. Results may show a benign variant, a pathogenic variant, or a variant of uncertain significance, which means the lab cannot yet tell whether that change affects health.
When should I consider getting a genetic test?
Genetic testing of the SHOC1 gene may be worth discussing if there is unexplained infertility, especially if semen testing shows no sperm because the body is not making enough. It can also be considered when similar fertility problems run in the family.
A genetic result is only one part of your health story
A genetic result can provide valuable insight, but how much it reveals depends on the condition and the type of variant involved. Over time, many factors influence how the body works, including lifestyle, environment, age, and medical history. For some conditions, especially those shaped by many genes, genetic information provides context rather than certainty and is best considered alongside other parts of care. In other situations, a genetic result can 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 DNA can change how the body breaks down a drug, moves it through the bloodstream, or responds at the drug’s target. This helps explain why the same treatment may work well for one person, seem less effective for another, or cause more side effects in someone who is more sensitive to it.
What is Pharmacogenetics?
Pharmacogenetics studies how genetic differences affect a person’s response to medications. It examines links between genes and drugs to help explain why the same treatment may work differently from one person to another. For many medicines, genes influence both how strongly a drug works and how the body processes it. This understanding can support more informed and more individualized treatment decisions. You can read more about this topic in the LearnHub.
Drugs influenced by the SHOC1 gene
When should I seek medical advice?
There is not yet a broadly confirmed link between this gene and how people respond to medicines, so questions about side effects, new symptoms, or changes in treatment are best discussed with your doctor.
History
SHOC1 entered the genetics literature through research on meiosis, the specialized cell division that makes eggs and sperm, as scientists worked to understand how chromosomes exchange genetic material. Initially understood only through studies in model organisms, it was later recognized as tied to a human gene with a similar role. From these first observations, research expanded steadily, linking the SHOC1 gene to the careful steps that help chromosomes pair and separate during reproduction. More recent clinical studies connected rare, disruptive variants in the SHOC1 gene with some cases of infertility, especially in people whose egg or sperm cells do not complete meiosis in the usual way.