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Troyer syndrome

Troyer syndrome



Overview

Troyer syndrome is a rare, complex form of hereditary spastic paraplegia characterized by progressive muscle stiffness and weakness in the lower limbs, developmental delays, and muscle wasting

A complex hereditary spastic paraplegia (HSP) that causes the slow degeneration of motor neurons and muscle cells.

Symptoms

Leg Problems: Progressive muscle stiffness (spasticity), weakness, and wasting in the legs, leading to difficulty walking, permanent leg shortening (contractures), and often the need for assistive devices or a wheelchair later in life.

Developmental Delays: Delays in learning to walk and talk during childhood.

Speech and Swallowing Issues: Speech difficulties (dysarthria), pseudobulbar palsy (trouble controlling facial muscles, chewing, and swallowing), and trouble managing oral secretions or drooling.

Hand Weakness: Muscle wasting and weakness in the hands (distal amyotrophy).

Physical Stature: Short stature and subtle skeletal abnormalities, such as knees that bend outward (valgus knees).

Emotional and Mood Changes: Emotional lability, including mood swings, inappropriate crying, or laughing.

Rare/Severe Features: Uncontrollable movements of the arms and legs (choreoathetosis) in more severe cases.

Causes

Gene Mutation: Changes or deletions in the SPART gene lead to a loss of normal functioning spartin proteins.

Inheritance Pattern: It is an autosomal recessive disorder, meaning a child must inherit one defective copy of the gene from each parent to develop the condition.

Endosomes and Mitochondria: Spartin normally helps regulate endosomes (which sort and recycle cell materials) and supports mitochondrial function for cell energy.

Lipid Buildup: Without normal spartin, cells fail to break down lipid droplets properly, causing fat molecules to accumulate inside cells, which damages neuron viability over time.

Diagnosis

Cardinal features: Doctors look for progressive spastic paraparesis (leg weakness and stiffness), dysarthria (speech difficulties), pseudobulbar palsy (difficulty swallowing, speaking, and controlling facial muscles), and distal amyotrophy (muscle wasting in the hands and feet).

Early signs: Assessments focus on early childhood history, such as delays in walking and speech, short stature, and emotional lability.

Supportive imaging: Brain magnetic resonance imaging (MRI) may show white matter abnormalities or a thin corpus callosum, though genetic testing is required for confirmation

Gene identification: The diagnosis is confirmed by finding mutations in both copies of the SPART gene (also known as SPG20).

Targeted testing: Targeted variant analysis can be used if there is a known family history or specific ancestral background (such as Old Order Amish populations where specific founder mutations are common).

Comprehensive panels: Multigene panels or comprehensive genomic sequencing can identify pathogenic variants when clinical features are complex or unclear.

Treatment

Physical therapy: Daily exercises maintain range of motion, improve muscle strength, and preserve mobility in the legs.

Occupational therapy: Helps patients adapt to daily tasks and utilize assistive devices.

Mobility aids: Walkers, braces, or ankle-foot orthoses assist with safe walking as leg weakness and stiffness advance.

Speech and feeding therapy: Speech-language pathology addresses slurred speech (dysarthria) and swallowing difficulties, reducing aspiration risks.

Spasticity treatments: Oral medications like baclofen or tizanidine help reduce muscle stiffness and spasms. Intrathecal baclofen delivered via a specialized pump may be used for severe cases.

Other symptom relievers: Medications such as oxybutynin manage urinary urgency, while antidepressants or mood stabilizers help control emotional lability or mood swings. Botox injections can also target localized spasticity.

Dantrolene caution: This antispasticity medication should generally be avoided in individuals who can still walk, as it can induce severe, irreversible weakness that worsens mobility.

Type of Doctor Department : A neurologist

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