Perrault syndrome

Perrault syndrome is caused by changes in certain genes and is usually inherited in an autosomal recessive pattern. Some risks are written in our DNA, passed down through families. Risk factors for Perrault syndrome include having parents who each carry the same gene change, having a sibling with the condition, or parents who are related by blood. People assigned female at birth are more likely to have ovarian problems, while males usually have hearing loss without ovarian involvement. Loud noise and some medicines that can harm hearing, like certain antibiotics or chemotherapy, may worsen hearing loss, so ear protection and careful drug choices can help.

Genetic risk factors

Perrault syndrome most often stems from changes in genes that help the cell’s energy centers (mitochondria) work properly. These changes are inherited in an autosomal recessive way, so parents are usually healthy carriers. Some risk factors are inherited through our genes. Genetic changes often underlie early symptoms of Perrault syndrome, such as newborn or early‑childhood hearing loss.

• Autosomal recessive: Perrault syndrome usually occurs when a child inherits two nonworking copies of the same gene, one from each parent. Parents are typically healthy carriers. New changes can arise but are uncommon in this condition.

• Nuclear, not maternal: Although many implicated genes affect mitochondria, they sit in the nuclear DNA. This condition is not typically inherited through mitochondrial DNA passed only by mothers.

• Mitochondrial processes: Most known Perrault syndrome genes help mitochondrial protein production or quality control. Faults in these steps particularly affect hearing cells and ovaries. This is why hearing loss can start early.

• HARS2 gene: Changes in HARS2 can cause Perrault syndrome. They often lead to childhood hearing loss and premature ovarian insufficiency in females. Neurologic complications are less frequent than with some other genes.

• LARS2 gene: LARS2 variants are a recurrent cause in several populations. Hearing loss typically begins in infancy or childhood. Ovarian function may vary from irregular periods to early menopause.

• CLPP gene: CLPP changes can cause Perrault syndrome with a higher chance of balance problems or nerve signs. Hearing loss may be severe from a young age. Some people also develop progressive movement issues.

• TWNK gene: Variants in TWNK (also known as C10orf2) are linked to Perrault syndrome. These can bring hearing loss plus neurologic features such as ataxia in some individuals. Severity can differ even within the same family.

• HSD17B4 gene: HSD17B4 variants can produce the same pattern of hearing loss and ovarian insufficiency. Some changes may also cause broader metabolic findings, so doctors sometimes check for additional signs. Careful gene-level interpretation is important.

• ERAL1 gene: ERAL1 changes are a rare cause. Founder variants have been reported in certain communities. Testing can target this gene when ancestry or family history points to it.

• CCDC51 gene: Variants in CCDC51 have been identified in a small number of families. The gene supports mitochondrial function in energy-demanding tissues. Reported cases are uncommon but well documented.

• Variable expressivity: Severity can vary widely in this condition, even between relatives with the same gene. Hearing loss may be stable or progressive, and neurologic signs may or may not appear. Females differ in how early ovarian changes begin.

• Family history: Having an affected sibling suggests both parents carry a Perrault syndrome–related variant. Each future pregnancy has about a 1 in 4 (25%) chance to be affected if both parental variants are present. Genetic counseling helps families understand options.

• Consanguinity: When parents are related by blood, the chance of the same rare variant meeting in a child is higher. This increases the risk for the condition. Carrier testing can clarify risks for relatives.

• Founder variants: In some regions or ancestries, a single historical change became more common. This can raise the local frequency of Perrault syndrome and guide which genes to test first. Lab reports often note known founder changes.

• Unknown genes: Some families meet the clinical picture but no genetic cause is found on current tests. This suggests additional genes remain to be discovered. Broader testing like exome or genome sequencing may help.

• Carrier detection: Carriers are typically healthy but can pass variants to children. Targeted testing can identify carriers in partners or relatives once a family variant is known. This supports informed family planning.

Transmission

Perrault syndrome is not contagious; it’s a genetic condition passed down in families. Most often, it follows an autosomal recessive pattern—both parents carry one nonworking copy of the same gene but typically have no symptoms—and with each pregnancy there is a 25% (1 in 4) chance a child will have Perrault syndrome, a 50% (1 in 2) chance the child will be a carrier, and a 25% chance the child will inherit neither change. Much less commonly, other inheritance patterns have been reported in certain families, so genetic testing can clarify how Perrault syndrome is inherited in your family. New (de novo) changes are rare in this condition, because it usually requires two altered copies, one from each parent.

When to test your genes

Consider genetic testing if you have lifelong sensorineural hearing loss, especially with ovarian insufficiency or fertility concerns, or if close relatives have similar features. Testing is also reasonable before family planning or when unexplained ataxia or neuropathy accompanies hearing loss. A genetics professional can guide timing, insurance coverage, and next steps.

Looking at the long-term picture can be helpful. Perrault syndrome affects hearing for nearly everyone and, in many, influences how the ovaries or testes develop and function. For day-to-day life, this often means using hearing aids or implants, speech support in childhood, and—for girls and women—attention to delayed puberty, irregular periods, or early menopause. Many people ask, “What does this mean for my future?”, and the short answer is that life span is usually near typical, especially when hearing and hormonal needs are well managed. Mortality directly related to Perrault syndrome is uncommon; risks tend to come from specific complications in certain subtypes, such as balance problems or nerve involvement that can raise fall risk.

Prognosis refers to how a condition tends to change or stabilize over time. Perrault syndrome is variable: some people have only hearing loss and infertility, while others also develop balance difficulties, nerve changes in the legs and feet, or learning challenges. Early symptoms of Perrault syndrome in childhood often center on hearing, but neurologic features—when they occur—may emerge later and can progress slowly. With ongoing care, many people maintain independence at home, school, and work, particularly when hearing support, hormone therapy, and physical or occupational therapy are in place.

When thinking about the future, it helps to plan for transitions: fertility counseling before family-building decisions, fall-prevention strategies if balance is affected, and regular hearing checks to optimize devices. In medical terms, the long-term outlook is often shaped by both genetics and lifestyle, and gene changes can partly explain why one person has only hearing issues while another has broader neurologic symptoms. Talk with your doctor about what your personal outlook might look like, including whether genetic testing could clarify which features to watch for over time.

Treatment for Perrault syndrome focuses on the main features: hearing loss and, in many, differences in sexual development and fertility. Hearing loss is usually managed with hearing aids or cochlear implants, plus early speech and language therapy; supportive care can make a real difference in how you feel day to day. For girls and women with ovarian insufficiency, hormone replacement (estrogen with progesterone as appropriate) can support puberty, menstrual health, and bone strength, while fertility options may include assisted reproduction or donor eggs. People who develop balance problems or nerve-related weakness may benefit from physical and occupational therapy, treatment of neuropathic pain if present, and regular follow-up with neurology and ophthalmology. Because Perrault syndrome varies, your doctor can help weigh the pros and cons of each option and coordinate care among audiology, endocrinology/gynecology, genetics, and rehabilitation.

When Perrault syndrome appears in a family, it most often follows an autosomal recessive pattern, meaning the condition develops when a child inherits the same gene change from both parents. Parents are typically healthy carriers, and with each pregnancy there’s a 25% chance (1 in 4) a child will have Perrault syndrome, a 50% chance the child will be a carrier, and a 25% chance of inheriting neither change. DNA testing can sometimes identify these changes. So far, several different genes have been linked to Perrault syndrome, many of which help cells manage energy in the inner ear and guide development of the ovaries—explaining why hearing and ovarian function are most affected. Even within the same family, the degree of hearing loss or the timing of ovarian insufficiency can differ, and males typically have hearing loss without the reproductive features. Genetic testing for Perrault syndrome, ideally arranged through a genetic counselor, can confirm the cause in many families, clarify carrier status, and inform care and family planning.

When hearing loss from Perrault syndrome is present, even common problems like recurrent ear infections or seasonal allergies can temporarily muffle sound and add to listening fatigue. Doctors call it a “comorbidity” when two conditions occur together. Certain medicines that affect the inner ear—such as aminoglycoside antibiotics, some chemotherapy drugs like cisplatin, and high doses of loop diuretics—can further damage hearing in people with Perrault syndrome, so it’s important to review drug risks ahead of time. Because early symptoms of Perrault syndrome often include childhood hearing loss, coexisting attention or learning differences may be harder to spot until hearing is well supported with aids or classroom accommodations. In females, ovarian insufficiency can lower estrogen levels, which may interact with other bone-health risks like low vitamin D or long-term steroid use, increasing the chance of low bone density and fractures. Neurologic features that sometimes occur in Perrault syndrome—such as balance problems or neuropathy—can combine with unrelated conditions that affect mobility (for example, diabetes-related neuropathy), making falls more likely without targeted therapy and safety planning.

How genes can cause diseases

Humans have more than 20,000 genes, each carrying out one or a few specific functions in the body. One gene instructs the body to digest lactose from milk, another tells the body how to build strong bones and another prevents the body's cells from beginning to multiply uncontrollably and developing into cancer. As all of these genes combined are the building instructions for our body, a defect in one of these genes can have severe health consequences.

Through decades of genetic research, we know the genetic code of any healthy/functional human gene. We have also identified that in certain positions on a gene, some individuals may have a different genetic letter from the one you have. We call these hotspots "Genetic Variations" or "Variants" in short. In many cases, studies have been able to show that having the genetic letter "G" in the position makes you healthy, but having the letter "A" in the same position disrupts the gene function and causes a disease. Genopedia allows you to view these variants in genes and summarizes all that we know from scientific research, which genetic letters (Genotype) have good or bad consequences on your health or on your traits.