The CFAP44 gene helps build and control the tiny moving tails on sperm and the hairlike structures called cilia on some cells. If this gene does not work properly, these structures may not move as they should, which can affect sperm movement and sometimes fertility. The protein made by this gene helps your cells keep these moving parts organized so they can beat in a coordinated way. In people with two pathogenic variants in the CFAP44 gene, male infertility linked to abnormal sperm tails is the best known effect.
What is a gene?
Genes are stretches of DNA that hold instructions your cells use to make molecules or regulate activities in the body. Some genes provide the directions for producing proteins, which do much of the work inside cells. Others mainly help determine when certain activities happen, where they take place, and how strongly they run. Taken together, genes affect how the body develops and functions, and they can influence how you respond to food, stress, or medications. For a deeper look at this topic, you can find more in the LearnHub.
Overview
CFAP44Gene function
What if the gene works
The CFAP44 gene helps build parts of motile cilia and sperm tails. This supports the rhythmic beating that moves mucus through the airways and helps sperm swim.
Risk
What if the gene does not work
Variants in the CFAP44 gene are best known for causing a form of male infertility, often with absent sperm movement and abnormal sperm tails. Milder and more severe variants can affect how strongly sperm flagella fail to form or move.
Treatment
What does that mean for your treatment
No treatment or drug choice is currently guided specifically by pathogenic variants in the CFAP44 gene. Care usually focuses on the person's symptoms, such as fertility support or treatment for cilia related problems, rather than targeting the CFAP44 gene itself. Research on the CFAP44 gene is mainly aimed at understanding sperm tail and cilia changes, not at a current gene targeted therapy.
Conditions associated with CFAP44
Gene function
What if the gene works
Smooth movement in certain cells depends on the CFAP44 gene. It helps tiny hair-like structures called motile cilia, as well as sperm tails, bend in a coordinated way. Understanding what the CFAP44 gene does helps explain how the body manages controlled cell movement and fluid flow.
The CFAP44 gene helps create a smooth, repeated bending pattern in motile cilia and sperm tails. This coordination allows these structures to move with a steady rhythm.
Inside these moving structures, CFAP44 helps the force-producing parts work together in the right sequence. That teamwork supports efficient motion instead of scattered movement.
In cilia, CFAP44 supports the sweeping action that moves fluid across cell surfaces. In sperm, it helps generate the wave-like tail motion needed for forward swimming.
What is a variant?
A genetic variant is a small difference in the DNA sequence within 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 do not have any noticeable effect and simply represent natural genetic variation. Sometimes, however, 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 CFAP44 gene can alter the protein’s shape, stability, or placement inside the sperm tail, disrupting the internal scaffold needed for coordinated beating. This is how CFAP44 gene variants affect sperm tail movement at a cellular level. Milder variants may leave activity, while severe variants, including changes that cut the protein short or disrupt how the gene message is assembled, often cause greater loss of function and are linked to absent sperm motility and marked tail abnormalities.
How variants are linked to conditions
Pathogenic variants in the CFAP44 gene are best known for causing some cases of male infertility, especially a pattern called multiple morphological abnormalities of the sperm flagella, where sperm tails are absent, short, coiled, or irregular. In this setting, CFAP44 gene variants and male infertility are linked through an inherited condition that usually involves altered copies from both parents. Some studies have also described laterality findings in a small number of people, but the clearest established association is with sperm movement problems.
A variant is not necessarily a diagnosis
Genetic variants are a routine part of human biology and are common across 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 certain diagnosis, especially when several genes and environmental factors are involved. 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?
For CFAP44, risk is mainly related to inheritance: people who inherit harmful changes in both copies of the CFAP44 gene can develop a sperm tail condition linked to male infertility. There is not yet broadly confirmed evidence that lifestyle or environmental factors meaningfully change this gene-related risk.
Inheritance of CFAP44 variants
CFAP44 inheritance in families usually follows an autosomal recessive pattern. This means a person typically has to inherit two CFAP44 gene variants, one from each parent, to have a CFAP44-related condition. Parents who each carry one variant are often unaffected carriers, and with each pregnancy there is a 25% chance their child will inherit both variants, a 50% chance the child will be a carrier, and a 25% chance the child will inherit neither variant. Sons and daughters can both inherit and pass on CFAP44 gene variants.
What does my CFAP44 result mean for my family?
For families with a CFAP44-related condition, the pattern is usually recessive, which means close relatives may also be carriers even if they have no symptoms. Brothers or sisters could have the same condition or be carriers, and other relatives on both sides of the family may carry the changed gene as well. This can matter for family planning, especially for relatives who have a partner who may also be a carrier.
Genetic information
Genetic testing
How you find out about variants
To find out whether you carry a variant in the CFAP44 gene, testing usually uses a blood sample or cheek swab. In CFAP44 genetic testing, a lab reads the DNA sequence and checks for changes linked with the condition being investigated. Results may show no relevant variant, one variant, or two variants.
When should I consider getting a genetic test?
Testing for the CFAP44 gene may be worth considering in men with ongoing infertility, especially when semen testing shows sperm with very poor movement or abnormal tails. It can also make sense when similar fertility problems run in the family or when a doctor suspects a condition affecting cilia, the tiny hair-like structures that help cells move.
A genetic result is only one part of your health story
A genetic finding can be informative, but how much it explains varies with the condition and the kind of variant present. Over time, factors like age, environment, lifestyle, and medical history also influence how the body functions. For some conditions, particularly those shaped by many genes, genetic information provides context rather than certainty and makes the most sense when considered with the rest of a person’s care. In other situations, a genetic result can offer a clear answer. In areas like medication response, it can also help put personal experiences into perspective.
Pharmacogenetics
How variants shape your response to medicine
Genetic variation can affect how people respond to medicines. This helps explain why the same drug may work well for one person, work less well for another, or cause more side effects in someone else. Differences in genes can change how the body breaks down, moves, or responds to a medicine, and this kind of variation is common.
What is Pharmacogenetics?
Pharmacogenetics looks at how differences in a person’s genes can affect their response to medications. It examines gene drug patterns 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 treatment decisions that are better informed and more individualized. To learn more about this topic, you can explore the LearnHub.
Drugs influenced by the CFAP44 gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in how medicines work, so questions about side effects, drug response, or new symptoms are best discussed with your doctor.