Introduction

Aarskog syndrome, also known as Aarskog-Scott syndrome or faciogenital dysplasia, is a rare genetic disorder primarily affecting males. However, females can be carriers and occasionally exhibit mild symptoms.1 First described by Dagfinn Aarskog and Charles I. Scott, Jr., the syndrome has distinctive facial features, musculoskeletal anomalies, and genital abnormalities. However, beyond these physical manifestations, individuals with Aarskog syndrome can experience a range of cognitive and behavioural challenges.² This article delves into the mental and behavioural aspects of Aarskog syndrome, exploring its causes, manifestations, and implications for those affected.

Genetic basis and physical manifestations

Aarskog syndrome is an X-linked disorder caused by mutations in the FGD1 gene on the X chromosome.1 This gene regulates cell shape and movement, particularly in skeletal and muscular system development. The primary physical features of Aarskog syndrome include:

• Facial features: 
  • Widely spaced eyes (hypertelorism)
  • A broad nasal bridge
  • A small nose, a long philtrum (the groove between the nose and upper lip)
  • Awidow's peak hairline

• Musculoskeletal abnormalities: 
  • Short stature
  • Brachydactyly (short fingers and toes) 
  • Delayed bone age
• Genital Abnormalities: 
  • Shawl scrotum (a fold of skin extending from the base of the penis around to the scrotum)
  • Undescended testes (cryptorchidism)
  • Inguinal hernia

A multidisciplinary approach involving general practitioners, general dentists, orthodontists and maxillofacial surgeons should help in evaluating dental-skeletal and facial aspects for future characterisation of the syndrome.³

Cognitive aspects of aarskog syndrome

Intellectual development

Cognitive development in individuals with Aarskog syndrome can vary widely. While some individuals are intelligent, others may experience mild to moderate intellectual disability. ¹ Specific cognitive challenges associated with Aarskog syndrome include:

• Learning disabilities: Difficulties with reading, writing, and arithmetic are common. These challenges can stem from both intellectual impairments and specific learning disabilities.
• Speech and language delays: Many children with Aarskog syndrome experience delayed speech and language development. Articulation problems, limited vocabulary, and difficulty in expression also occur.
• Attention deficits: Attention Deficit Hyperactivity Disorder (ADHD) or symptoms of inattention and hyperactivity can be present, further complicating academic achievement and daily functioning.

Neurological factors

The cognitive challenges seen in Aarskog syndrome are due to underlying neurological abnormalities.¹ Although detailed neuroimaging studies are limited, evidence suggests structural brain differences in some individuals with the syndrome. These differences may affect brain regions involved in cognitive processes, contributing to the observed intellectual and learning difficulties.

Behavioural aspects of aarskog syndrome

Social interaction and communication

Children with Aarskog syndrome often exhibit social and communication difficulties (2). These challenges can include:

• Social skills deficits: Individuals may have trouble understanding social cues and norms, leading to awkward or inappropriate interactions. It can result in social isolation or difficulties in forming and maintaining friendships.
• Communication challenges: Beyond speech and language delays, there can be issues with pragmatic language, such as understanding and using language in social contexts. It includes challenges with conversation skills, non-verbal communication, and interpreting the emotions and intentions of others.

Emotional and behavioural regulation

Behavioural regulation is  a significant challenge for individuals with Aarskog syndrome. ² Common issues include:

• Emotional Dysregulation: Difficulty managing emotions can lead to frequent mood swings, irritability, and outbursts. These emotional challenges increase with frustration over cognitive and social difficulties.
• Impulsivity and hyperactivity: Many individuals exhibit impulsive behaviours and hyperactivity, often associated with ADHD. These behaviours can interfere with learning and social interactions.
• Anxiety and depression: Emotional challenges and social isolation can contribute to anxiety and depression. It is particularly concerning as individuals enter adolescence and become more aware of their differences from peers.

Implications for intervention and support

Early diagnosis and Intervention

Early diagnosis of Aarskog syndrome is crucial for providing timely and appropriate interventions. Genetic testing can confirm the diagnosis, allowing for a comprehensive management plan that addresses physical and cognitive-behavioural needs. (Early intervention programs can significantly improve outcomes by focusing on):

• Speech and language therapy: To address delays and improve communication skills
• Occupational therapy: To assist with fine motor skills, sensory integration, and activities of daily living
• Educational support: Individualized Education Programs (IEPs) tailored to the child's specific learning needs can enhance academic success

Behavioural interventions

Behavioural interventions are essential for managing the cognitive and behavioural challenges associated with Aarskog syndrome. ² These interventions may include:

• Behavioural therapy: Techniques like Applied Behavior Analysis (ABA) help develop social skills, manage behaviour, and improve communication.
• Social skills training: Programs that enhance social understanding and interaction skills are beneficial.
• Counselling and support groups: Psychological counselling for anxiety and depression, as well as support groups for families, can provide emotional support and practical strategies for managing the syndrome.

Educational strategies

Educators working with children with Aarskog syndrome must know their unique needs and challenges. ³ Effective strategies include:

• Differentiated instruction: Tailoring teaching methods to accommodate different learning styles and abilities.
• Structured learning environment: A predictable and structured classroom environment can help manage attention and behaviour problems.
• Collaborative approach: Working closely with parents, therapists, and other professionals to create a cohesive support network.

Research and future directions

Research into the cognitive and behavioural aspects of Aarskog syndrome is still in its early stages. Future studies are needed to:

• Better understanding of neurological underpinnings: Advanced neuroimaging techniques can help elucidate the brain structures and functions affected in Aarskog syndrome.
• Develop targeted interventions: Research into specific cognitive and behavioural interventions tailored to the needs of individuals with Aarskog syndrome can improve outcomes.
• Explore genetic and environmental interactions: Investigating how genetic factors interact with environmental influences can provide insights into managing and mitigating cognitive and behavioural challenges.

FAQs

Where can I find a rare disease expert?

Rare disease experts work at research or teaching hospitals. The National Organization for Rare Disorders (NORD) contains a list of rare disease centres with experts who work together to find treatments and cures for rare diseases.

Can mutation in genes cause aarskog-Scott syndrome?

Mutation in the FGD1 gene causes Aarskog-Scott syndrome.

When should treatment for aarskog syndrome be started?

The symptoms are visible by the time a child is three years old. Treatment is given as early as possible so a patient can live a reasonable life and grow old. 

Summary

Aarskog syndrome, while primarily recognized for its physical manifestations, also encompasses significant cognitive and behavioural aspects that impact the lives of those affected. Understanding these challenges is crucial for providing comprehensive care and support. Early diagnosis, targeted interventions, and ongoing research help individuals with Aarskog syndrome achieve better outcomes and lead fulfilling lives. As awareness of the syndrome grows, so does the potential for improved interventions and support systems, offering hope and enhanced quality of life for those affected.