Advancements in genetic testing have made it possible to identify specific genetic causes of male infertility, allowing for targeted treatment options and guidance on reproductive options for affected individuals.

 

What Is Male Fertility?

 

A male is considered fertile when he experiences no sexual dysfunction and has no problems conceiving with his partner. On a more scientific level, fertility is defined by a semen sample containing 15 million sperm or more per millilitre. Various factors can affect male fertility, eventually resulting in fertility problems and the inability to conceive.

 

How Can Male Fertility Be Tested?

 

A male’s fertility can be measured via a semen analysis. This can be done at home or at the doctor’s office.

 

At-home Testing

The easiest way to test a male’s fertility is by using a self-testing kit. Most men turn to this option as it is non-invasive and private; however, these kits can produce false results. Most of these kits only test the sperm count and none of the other parameters, making the results unreliable, as fertility is defined by more factors than just the sperm count.

 

In-office Testing

If the kit gives inaccurate results, or a patient is not happy or satisfied with the results, it is recommended that they see a doctor. Usually, the doctor will conduct a physical examination assessing the patient’s vitals as well as any abnormalities within the testicular area. The doctor will then require some tests including:

 

Semen Analysis

A semen analysis is conducted when the patient provides a semen sample that is sent to the laboratory. The scientists at the laboratory will analyse the sample by looking at certain parameters such as the semen volume, the sperm concentration, the sperm motility and structure as well as the pH and the presence of any infection. When any of these parameters are out of range, it can be an indication to the doctor where the patient’s problem might be and why he is experiencing fertility-related problems.

 

Hormone Test

Often a hormone test will also be requested by the doctor. This is done by means of a blood sample that is also sent to the laboratory for analysis. The laboratory will test for hormones like testosterone and follicle-stimulating hormone (FSH) as these hormones play a crucial role in the initiation of the spermatogenesis process and the maturation of the sperm. When these hormones are out of balance, it can cause fertility problems.

This is important for a doctor to know in order to make an appropriate diagnosis and treat it accordingly. Luckily there are treatment options to consider like assisted reproductive therapy including testosterone injections, to optimise the testosterone levels and the sperm count.

 

Scans

If the doctor is still concerned or not satisfied with the results, they may request some scans including a scrotal and rectal ultrasound, to test for any torsions or tumours. It might also be necessary to perform a prostate exam. These scans will also enable the doctor to see if there are any blockages hindering the sperm from being released in the ejaculate.

 

Antibody Tests

The doctor might also request a sperm antibody test which is done via a semen sample. This will test if there are any antibodies present in the semen, meaning the immune system and the reproductive tract have crossed paths via a possible torsion somewhere. This is clinically significant, as these antibodies will attack the sperm and cause a loss of sperm, resulting in infertility.

 

Genetic Test and Biopsy

A genetic test may also be conducted to confirm if there are any genetic abnormalities, like chromosomal abnormalities, that might have an impact on sperm production or the structure thereof. This test along with a testicular biopsy is usually left as a last resort if all other tests have been unsuccessful or inconclusive. The biopsy will entail testing a piece of the testicular tissue for the presence of sperm.

It is recommended to consider genetic testing when all other fertility tests have been inconclusive and to rule out any other causes of infertility. These tests can even be considered to diagnose congenital abnormalities and inherited syndromes like Down Syndrome.

 

How Does Genetics Affect Male Fertility?

 

Genetics plays a significant role in male fertility, impacting factors like sperm production, function, and overall reproductive health. Genetic variations, mutations, and chromosomal abnormalities can all contribute to male infertility.

 

Chromosomal Abnormalities

Men with certain chromosomal abnormalities, like Klinefelter syndrome (47,XXY), often experience reduced sperm production or azoospermia (no sperm in the ejaculate). Structural abnormalities like Y-chromosome microdeletions can also lead to low sperm count or absence of sperm production. This can also lead to the arrest of sperm maturation.

 

Aneuploidy

Aneuploidy, the presence of an abnormal number of chromosomes in a cell, is a common chromosomal defect found in males born with non-obstructive azoospermia, or the absence of sperm in the semen not caused by an obstruction in the reproductive tract. The most well-known syndrome associated with this is Klinefelter syndrome, where a male has an extra copy of the X chromosome. This syndrome causes men to have smaller testes and a significant disruption in sperm production.

 

Gene Mutations

Specific gene mutations affect sperm quality and motility. For example, mutations in the CFTR gene (associated with cystic fibrosis) can lead to congenital bilateral absence of the vas deferens (CBAVD), thereby preventing sperm transport.

 

Hormone-Related Abnormalities

Genes that regulate hormones influence the production of follicle-stimulating hormone (FSH) and luteinising hormone (LH). Abnormalities in these genes can disrupt sperm production by impacting testosterone and other hormone levels crucial for fertility.

 

Epigenetic Changes

Environmental factors, such as diet, stress, and exposure to toxins, can lead to epigenetic changes — alterations in gene expression without changing the DNA sequence. These modifications can affect sperm quality and may even be passed on to future generations.

 

DNA Integrity and Repair Genes

Genes responsible for DNA repair, such as the BRCA genes, are essential for maintaining DNA integrity in sperm cells. Damage to these genes can lead to high levels of DNA fragmentation in sperm, which is linked to reduced fertility and a higher risk of miscarriage in partners.

 

Mitochondrial DNA

Unlike nuclear DNA, mitochondrial DNA is inherited maternally, but it plays a crucial role in sperm motility and energy production. Mutations in mitochondrial DNA can impair sperm’s ability to swim effectively, reducing its likelihood of reaching and fertilising an egg.

 

Lifestyle Changes To Improve Male Fertility

 

Men can make several lifestyle changes to improve fertility, focusing on physical health, diet, stress management, and avoiding harmful substances. Here are some key areas:

 

Exercise Regularly

Regular, moderate exercise helps maintain a healthy weight, boosts testosterone levels, and improves blood circulation, which is essential for sperm production. However, excessive, intense exercise may lower testosterone levels, so balance is key. Aim for activities like strength training and cardio at a moderate level.

 

Healthy Diet

A nutrient-rich diet supports fertility by providing antioxidants, vitamins, and minerals that protect sperm from oxidative stress. Include foods high in zinc (such as meat, shellfish, and nuts), selenium (found in Brazil nuts, fish, and poultry), vitamin C (citrus fruits and berries), and folic acid (leafy greens and legumes). Omega-3 fatty acids found in fish, flaxseed, and walnuts can also improve sperm quality.

 

Manage Stress

Chronic stress can increase cortisol levels, which may negatively affect testosterone and sperm production. Practices such as mindfulness meditation, yoga, breathing exercises, or engaging in enjoyable hobbies can help reduce stress and boost reproductive health.

 

Limit Alcohol and Avoid Recreational Drugs

Excessive alcohol can harm sperm production, motility, and count, while recreational drugs (especially marijuana and anabolic steroids) can impact testosterone levels and sperm health. Limit alcohol intake and avoid recreational drugs to support fertility.

 

Stop Smoking

Smoking has been shown to lower sperm count and quality and increase the risk of DNA damage in sperm. Quitting smoking can significantly improve sperm health over time.

 

Reduce Exposure to Environmental Toxins

Some chemicals, such as pesticides, heavy metals, and pollutants, may impair sperm health. Wherever possible, avoid exposure to such chemicals by wearing protective gear if you work in an environment containing these toxins, and avoid plastics containing BPA, which may disrupt hormone levels.

 

Maintain a Healthy Weight

Obesity is linked to hormonal imbalances, lower testosterone, and increased oestrogen, all of which negatively affect sperm production. Aim for a balanced diet and regular exercise to maintain a healthy weight.

 

Get Enough Sleep

Quality sleep (7–8 hours per night) is essential for maintaining hormone balance and supporting testosterone levels. Good sleep hygiene, such as setting a regular bedtime and limiting screen time before bed, can support better rest and fertility.

 

Avoid Excessive Heat to the Groin

High temperatures can impair sperm production. Avoid hot tubs, saunas, and wearing tight clothing that traps heat around the groin area to keep the testicles at an optimal temperature.

 

Consider Supplements

Certain supplements, such as coenzyme Q10, vitamin D, and antioxidants, have shown some benefits for sperm health. Always consult a healthcare provider before starting any supplement.