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Arts syndrome
This X-linked condition primarily affects males, leading to early-onset, progressive symptoms such as muscle weakness, difficulty with movement, and impaired vision, significantly impacting quality of life.
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Overview
Arts syndrome is a very rare genetic condition that primarily affects the nervous system. It is characterised by a combination of severe neurological problems, profound hearing impairment, and intellectual disability [PMID:17943542]. Symptoms typically begin in early childhood and tend to worsen over time. The condition is inherited in an X-linked recessive pattern, meaning it mostly affects males.
Symptoms & clinical features
Individuals with Arts syndrome often experience a range of symptoms. Profound sensorineural hearing loss is a common feature, often present from birth or developing early in life. Neurological symptoms are also prominent and can include problems with balance and coordination (ataxia), muscle weakness, and difficulties with speech (dysarthria) [PMID:17943542]. Some individuals may also have optic atrophy, which affects vision. As the condition progresses, there can be a decline in motor skills and intellectual function. Recurrent infections are also reported in some individuals with Arts syndrome.
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Affected organs
Arts syndrome primarily affects the brain and nervous system, leading to its characteristic neurological features. The ears are significantly impacted, resulting in severe to profound hearing loss. The eyes can also be affected, specifically the optic nerve, leading to vision impairment. The overall body can experience muscle weakness due to the neurological effects. The immune system may also be compromised in some cases, contributing to recurrent infections.
Risks & severity
Arts syndrome is a severe condition with symptoms typically appearing in early childhood. The neurological problems are progressive, meaning they tend to worsen over time, leading to increasing disability. The profound hearing loss often requires early intervention. Due to the progressive nature of the condition and its multiple effects on body systems, Arts syndrome significantly impacts life expectancy and quality of life. The exact prevalence of Arts syndrome is not well established, but it is considered a very rare condition.
Genetic causes
Arts syndrome is caused by pathogenic variants in the PRPS1 gene. This gene provides instructions for making an enzyme called phosphoribosyl pyrophosphate synthetase 1 [PMID:17943542]. This enzyme is crucial for the production of purines and pyrimidines, which are essential building blocks for DNA and RNA. It is also involved in the metabolism of certain neurotransmitters, chemical messengers in the brain. Pathogenic variants in PRPS1 lead to a shortage of this enzyme or a faulty version of it, disrupting these vital biochemical pathways. This disruption particularly affects cells with high energy demands, such as those in the nervous system and inner ear, leading to the symptoms seen in Arts syndrome [PMID:17943542].
- PRPS1 phosphoribosyl pyrophosphate synthetase 1The PRPS1 gene provides instructions for making phosphoribosyl pyrophosphate synthetase 1, an enzyme critical for nucleotide production and purine salvage pathways.
Inheritance pattern
Arts syndrome is inherited in an X-linked recessive pattern. This means the PRPS1 gene, which causes the condition, is located on the X chromosome. Males have one X chromosome and one Y chromosome, so if their single X chromosome carries a pathogenic variant in PRPS1, they will develop the condition. Females have two X chromosomes. If one of their X chromosomes has a pathogenic PRPS1 variant, they are typically carriers and usually do not show symptoms, as their other healthy X chromosome can compensate. However, female carriers can pass the variant to their children. Each son of a carrier mother has a 50% chance of inheriting the variant and developing Arts syndrome, while each daughter has a 50% chance of being a carrier.
X-linked recessive: sons of a carrier mother have a 50% chance of being affected. Daughters have a 50% chance of being carriers.
Diagnosis & testing
Diagnosis of Arts syndrome is typically suspected based on an individual's clinical symptoms, such as progressive neurological decline, profound hearing loss, and intellectual disability, especially in males. Confirmation of the diagnosis is made through genetic testing, which looks for pathogenic variants in the PRPS1 gene. In the UK, genetic testing for suspected inherited conditions often follows a pathway starting with a referral from a specialist clinician (e.g., a neurologist or geneticist) to a regional genetics service. Arts syndrome is covered by specific NHS Genomic Medicine Service (GMS) 'R codes' for testing, which facilitate access to appropriate genetic diagnostics.
Management & lifestyle
There is currently no cure for Arts syndrome, so management focuses on alleviating symptoms and improving quality of life. Management typically involves a multidisciplinary team of specialists. For hearing loss, interventions like hearing aids or cochlear implants may be considered. Physical and occupational therapy can help address muscle weakness and motor difficulties. Speech and language therapy can assist with communication challenges. Regular follow-up with neurologists and other specialists is important to monitor disease progression and manage complications. Genetic counselling is also a crucial part of care, providing information to affected individuals and families about the condition, inheritance patterns, and reproductive options.
UK care pathway
In the UK, individuals suspected of having a rare genetic condition like Arts syndrome typically enter the NHS Genomic Medicine Service (GMS) pathway. This usually begins with a referral from a specialist clinician to a Clinical Genetics service. Genetic counsellors play a vital role, offering information, support, and discussions about the implications of genetic testing. Arts syndrome is associated with specific R-codes for genomic testing within the GMS, which helps ensure that appropriate genetic diagnostics are available and accessible.
Frequently asked questions
What is the life expectancy for someone with Arts syndrome?
Arts syndrome is a severe, progressive condition that significantly impacts life expectancy. The disease course and severity can vary between individuals, but the progressive neurological deterioration often leads to a shortened lifespan.
Can females develop Arts syndrome?
Arts syndrome is an X-linked recessive condition, so it primarily affects males. Females are typically carriers and do not show symptoms because they have a second healthy X chromosome. Very rarely, females who are carriers can show some milder symptoms, but this is uncommon.
Is there a cure for Arts syndrome?
Currently, there is no cure for Arts syndrome. Treatment focuses on managing the symptoms and providing supportive care to improve the individual's quality of life. This includes therapies for hearing, movement, and speech difficulties.
How is Arts syndrome inherited?
Arts syndrome is inherited in an X-linked recessive pattern. This means that a pathogenic variant in the PRPS1 gene is located on the X chromosome. Affected males inherit the variant from their carrier mothers. Carrier females typically do not have symptoms but can pass the variant to their children.
What kind of doctors treat Arts syndrome?
People with Arts syndrome are usually cared for by a team of specialists. This often includes neurologists, audiologists (for hearing), ophthalmologists (for vision), geneticists, physical therapists, occupational therapists, and speech and language therapists. Genetic counsellors also provide crucial support for families.
References
- Adam MP, Bick S, Mirzaa GM. Phosphoribosylpyrophosphate Synthetase Deficiency. 1993. PMID: 20301738
- Chen L, Zhou Q, Zhang P. Direct stimulation of de novo nucleotide synthesis by O-GlcNAcylation. Nature chemical biology. 2024. PMID: 37308732
- Kelley RE, Andersson HC. Disorders of purines and pyrimidines. Handbook of clinical neurology. 2014. PMID: 24365355
- Hu HH, Lu GM, Chang CC. Filamentation modulates allosteric regulation of PRPS. eLife. 2022. PMID: 35736577
- Delos Santos K, Kwon E, Moon NS. PRPS-Associated Disorders and the Drosophila Model of Arts Syndrome. International journal of molecular sciences. 2020. PMID: 32650483
- Procaci VR, Camara VAV, Filho FMR. Arts Syndrome and Involuntary Eye Movements. Movement disorders clinical practice. 2026. PMID: 41902395
- Mittal R, Patel K, Mittal J. Association of PRPS1 Mutations with Disease Phenotypes. Disease markers. 2015. PMID: 26089585
- de Brouwer AP, van Bokhoven H, Nabuurs SB. PRPS1 mutations: four distinct syndromes and potential treatment. American journal of human genetics. 2010. PMID: 20380929