The LHB gene helps the pituitary gland make luteinizing hormone, a key signal for ovulation and for testosterone production. If this gene does not work properly, the body may make too little working hormone. People with harmful variants can have delayed or absent puberty, irregular or absent ovulation, low testosterone, and reduced fertility. Understanding this gene can help make sense of some inherited reproductive hormone problems.
What is a gene?
Genes are stretches of DNA that give your cells instructions for making molecules or guiding activities in the body. Some genes carry the information needed to produce proteins, the parts of cells that do the work. Others mainly control when certain processes happen, where they happen, and how strongly they run. Together, genes affect how the body develops and works, and they can also influence how you respond to food, stress, and medications. For a more detailed look at this topic, you can find more in the LearnHub.
Overview
LHBGene function
What if the gene works
Your pituitary gland uses the LHB gene to make part of luteinizing hormone. This hormone helps trigger ovulation and support progesterone production in ovaries, and it helps the testes make testosterone.
Risk
What if the gene does not work
Variants in the LHB gene can reduce luteinizing hormone signals, often causing delayed or absent puberty and fertility problems. Effects can range from milder hormone changes to more severe low sex hormone levels, with underdeveloped sexual features or ovulation problems.
Treatment
What does that mean for your treatment
A pathogenic variant in the LHB gene can make LH activity the main treatment focus. Clinicians often use hCG, which acts like LH, to support puberty, testosterone production, and sperm production; FSH may be added when fertility is the goal. In females, ovulation induction may use gonadotropin treatment that provides LH activity.
Conditions associated with LHB
Gene function
What if the gene works
This gene helps your pituitary gland send clear hormone signals to the ovaries or testes. The protein made from the LHB gene forms part of luteinizing hormone, often called LH. Understanding the LHB gene's role in ovulation and testosterone production makes it easier to see how the body coordinates key reproductive steps.
The LHB gene makes the beta part of luteinizing hormone. This beta part joins a shared alpha part to create the finished LH hormone and gives the signal its specific identity.
In the ovaries, LH helps a mature egg complete its final steps and be released during ovulation. It also supports the temporary gland that forms after ovulation, which makes progesterone for the second half of the menstrual cycle.
In the testes, LH tells special cells to make testosterone. This supports sperm production and helps maintain many day to day male reproductive functions.
What is a variant?
Within a gene, a genetic variant is a small difference in the DNA sequence. These differences are common and help shape normal human diversity, such as variation in appearance, metabolism, or the way the body responds to environmental influences. Many variants do not lead to any noticeable effect and simply represent natural genetic variation. In some situations, 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 LHB gene can change the shape of the beta part of luteinizing hormone, making it less stable, harder to assemble, or less able to send its signal. LHB gene variants can affect luteinizing hormone production from mildly to markedly, with some leaving partial activity and more disruptive variants greatly reducing or eliminating signaling. When little or no active hormone is made, puberty and fertility problems may appear earlier or be more noticeable.
How variants are linked to conditions
Rare pathogenic variants in the LHB gene cause isolated luteinizing hormone deficiency, a confirmed genetic condition often recognized through delayed or absent puberty and infertility. In males, this is commonly associated with low testosterone, limited pubertal development, and reduced fertility. In females, some may have absent periods, difficulty ovulating, or infertility. Common LHB variants have also been studied in reproductive conditions, but those links are less consistent.
A variant is not necessarily a diagnosis
Genetic variants are a routine part of human biology and are widely found in the general population. Most have no 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 also contribute. 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 is not yet broadly confirmed evidence on specific factors that increase or reduce risk related to the LHB gene itself. For rare inherited LHB-related conditions, risk is mainly tied to the gene change a person is born with, while symptoms and fertility can still vary from one person to another.
Inheritance of LHB variants
For the main condition linked to the LHB gene, the LHB gene inheritance pattern is autosomal recessive. This means a child usually inherits one altered copy from each parent, and parents who carry one copy typically do not have symptoms. When both parents carry an LHB gene variant, each pregnancy has a 25% chance of the child inheriting both altered copies, a 50% chance of being a carrier, and a 25% chance of inheriting neither altered copy. Because the LHB gene is on chromosome 19, this pattern is the same for males and females.
What does my LHB result mean for my family?
For families with a disease-causing change in the LHB gene, the usual pattern is recessive, which means close relatives can be healthy carriers without knowing it. Brothers, sisters, and future children may also carry the same change, and in some families another child could be born with the condition if both parents are carriers. Family implications can differ depending on the exact result and the condition linked to it.
Genetic information
Genetic testing
How you find out about variants
To find variants in the LHB gene, labs use genetic testing on blood, saliva, or a cheek swab. LHB genetic testing usually reads the gene’s DNA code with sequencing and compares it with a reference sequence to spot changes.
When should I consider getting a genetic test?
Genetic testing for the LHB gene may be worth considering when delayed or absent puberty, very low testosterone or estrogen levels, or unexplained infertility suggest a rare problem with luteinizing hormone, the signal that helps the ovaries or testes work. It can also be relevant if this pattern runs in the family.
A genetic result is only one part of your health story
A genetic result can provide useful insight, but how much it explains depends on the condition and the kind of variant involved. How the body functions over time is also shaped by many factors, 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 considered 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 also help put individual experiences into context.
Pharmacogenetics
How variants shape your response to medicine
Genetic variation can affect how your body responds to medicines, so the same treatment may work differently from one person to another. Some people process a drug more slowly or more quickly, while others are naturally more or less sensitive to its effects. This is common and can influence how well a medicine works or how likely side effects are.
What is Pharmacogenetics?
Pharmacogenetics looks at how genetic differences shape a person’s response to medications. It studies the relationship between genes and drugs to help explain why the same treatment can work differently from one person to another. For many medicines, genes affect how strongly a drug works or how the body processes it. This information can support treatment decisions that are more informed and more individualized. You can read more about this topic in the LearnHub.
Drugs influenced by the LHB gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in guiding medication response. If a medicine is causing side effects, not working as expected, or you have concerns about your treatment or general health, talk with your doctor.
History
Luteinizing hormone was recognized in the early 20th century as scientists worked out how the pituitary gland influences fertility and sexual development. Initially understood only through visible traits, later recognized as tied to a specific gene, the LHB gene was identified as the part that encodes the hormone’s beta subunit, which gives the hormone its specific identity. From these first observations, research expanded steadily as hormone purification methods improved and gene sequencing became possible. By the late 20th century, studies of the LHB gene had helped connect rare inherited variants with differences in puberty and reproductive health. Over time, descriptions became more precise, moving from hormone measurements in the lab to direct analysis of the gene itself.