The MEIOB gene helps your body make healthy eggs and sperm by repairing DNA during meiosis, the special cell division used to form reproductive cells. If this gene does not work properly, that repair process can fail, and eggs or sperm may not develop as they should. People with harmful variants in the MEIOB gene may have infertility, including very low sperm production or early loss of ovarian function. MEIOB is mainly known in fertility medicine rather than public culture.
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 information needed to produce proteins, the working parts of cells. Other genes mainly help control when certain processes happen, where they take place, and how strongly they run. Together, genes affect how the body develops and functions, and they can also shape how you respond to food, stress, or medications. For a more detailed look at this topic, you can read more in LearnHub.
Overview
MEIOBGene function
What if the gene works
The MEIOB gene helps developing egg and sperm cells repair and exchange DNA during meiosis, the special cell division that makes reproductive cells. This supports normal chromosome pairing and fertility.
Risk
What if the gene does not work
Variants in the MEIOB gene can disrupt egg or sperm formation, causing infertility, including primary ovarian insufficiency in some women and azoospermia in some men. Milder or more severe variants may shape which features appear and how marked they are.
Treatment
What does that mean for your treatment
No treatment or management approach is currently established specifically for pathogenic or loss of function variants in the MEIOB gene. The MEIOB gene is being studied in cancer research as a possible marker of altered DNA repair, but this does not yet guide routine drug choices.
Conditions associated with MEIOB
Gene function
What if the gene works
The MEIOB gene is active during the special cell division that makes sperm and eggs. In that setting, it helps cells manage DNA as chromosome pairs meet, exchange pieces, and prepare healthy reproductive cells. This background helps explain why the MEIOB gene matters during reproductive cell development.
During sperm and egg cell formation, the MEIOB gene helps cells hold exposed single DNA strands. This keeps the strands steady while the cell checks, copies, and uses them for planned DNA exchange.
Its protein helps matching chromosome pairs find each other and stay aligned during meiosis, the cell division used to make eggs and sperm. This alignment supports accurate DNA handling as reproductive cells form.
One of its main jobs is to support crossing over, the normal swap of DNA between chromosome pairs. This shuffle helps reproductive cells receive the right mix of genetic material.
The MEIOB gene works with SPATA22 and other repair proteins (cell tools that manage DNA) during meiosis. Together, they guide planned DNA break processing in a controlled way so cell division can move forward smoothly.
What is a variant?
A genetic variant is a small change in a gene’s DNA sequence. These changes are common and are part of normal human diversity, including differences in appearance, metabolism, and the way the body responds to environmental influences. Many do not produce any noticeable effect and simply represent 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 MEIOB gene can change how the protein folds, binds exposed DNA strands, or connects with SPATA22, which helps explain how MEIOB gene variants affect meiosis. More severe variants, such as changes that create an early stop signal, often leave little or no working protein. Milder single-letter changes may partly reduce stability or activity instead of fully blocking it. That range in protein damage can influence how strongly fertility is affected.
How variants are linked to conditions
Pathogenic variants in the MEIOB gene are mainly linked to infertility. In women, they can cause primary ovarian insufficiency, which may lead to absent or irregular periods and difficulty becoming pregnant. In men, MEIOB gene variants have been associated with nonobstructive azoospermia, a form of infertility in which sperm are absent from the semen.
A variant is not necessarily a diagnosis
Genetic variants are a routine part 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 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?
There isn't yet broadly confirmed evidence on specific factors that increase or reduce health risk related to the MEIOB gene. If a MEIOB change is found, its effect can depend on the exact variant and family context, so personal risk is best discussed with a doctor or genetic counselor.
Inheritance of MEIOB variants
For the best-established MEIOB gene inheritance pattern, MEIOB-related fertility conditions are inherited in an autosomal recessive way. This means a person usually inherits one altered copy of the MEIOB gene from each parent, and parents who each carry one variant are often unaffected themselves. When both parents are carriers, each pregnancy has a 25% chance of the child inheriting both variants, a 50% chance of being a carrier, and a 25% chance of inheriting neither variant. Because MEIOB is on chromosome 16, this inheritance pattern is the same for sons and daughters.
What does my MEIOB result mean for my family?
For MEIOB, the clearest family pattern so far is recessive, which means relatives are more likely to be carriers than to have symptoms themselves. Brothers or sisters could also carry the same gene change, and in some families an affected sibling may be possible if both parents carry it. The meaning for children usually depends on whether the other biological parent also carries a MEIOB change.
Genetic information
Genetic testing
How you find out about variants
To look for variants in the MEIOB gene, doctors use genetic testing, usually on a blood sample, cheek swab, or saliva sample. In MEIOB gene genetic testing, a lab reads the DNA code and compares it with the usual sequence to see whether a variant is present.
When should I consider getting a genetic test?
There is not yet a broadly established reason to test the MEIOB gene on its own. Decisions about genetic testing are usually based on your personal or family history, especially fertility problems, and are best made with a doctor or genetic counselor.
A genetic result is only one part of your health story
Genetic findings can provide useful insight, but how much they reveal depends on the condition and the type of variant involved. Many factors, including lifestyle, environment, age, and medical history, shape how the body works over time. For some conditions, especially those influenced by many genes, genetic information provides context rather than certainty and is most helpful when considered alongside other parts of care. In other situations, a genetic result can offer a clear answer. In areas like medication response, genetic results may also help place individual experiences in 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 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. These differences are common and are one part of the bigger picture, along with age, other health conditions, and other medicines.
What is Pharmacogenetics?
Pharmacogenetics studies the ways genetic differences can affect a person’s response to medication. It examines relationships between genes and drugs to better understand why the same treatment may work differently in different people. For many medicines, genes influence both how strong a drug’s effects are and how the body processes it. This information can support treatment decisions that are more informed and more individualized. More detail on this topic is available in the LearnHub.
Drugs influenced by the MEIOB gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in guiding medication response, so questions about medicines, side effects, or your overall health are best discussed with your doctor.
History
Researchers identified the MEIOB gene in the early 2010s while studying how egg and sperm cells form. Initially understood through laboratory work in mice and human cells, later recognized as tied to a specific gene, MEIOB became part of a growing effort to map the genes involved in fertility. Building on this early work, scientists linked harmful variants in the MEIOB gene to some cases of infertility and primary ovarian insufficiency. Over time, descriptions became more precise as genetic testing made it easier to connect MEIOB variants with patterns seen in affected families. The way this gene was viewed has shifted over time, from a research finding to a clinically relevant fertility gene.