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PubMed This is a summary of 19 peer-reviewed journal articles Updated
Neurology

Symptoms and Progression of Complex AD-HSP

At a Glance

Complex AD-HSP is a genetic disorder that causes progressive leg stiffness and weakness, alongside additional neurological symptoms like balance issues or nerve pain. Progression is slow over many decades, and symptoms vary widely from person to person, even within the same family.

Living with Autosomal Dominant Complex Spastic Paraplegia (AD-HSP) means navigating a condition that affects different people in very different ways [1][2]. While the core of the disorder involves the legs, the “complex” label means other parts of your nervous system are also involved [3][4]. Because this condition is heterogeneous (highly variable), your experience may not look exactly like someone else’s, even if you have the same genetic mutation [2][5].

The Core Symptoms: Lower-Limb Spasticity

The foundation of all forms of HSP is the progressive involvement of the legs. This is caused by damage to the upper motor neurons in the spine [6][7]. You may experience:

  • Spasticity: A persistent stiffness or tightness in the leg muscles that can make moving them feel like walking through water [6][8].
  • Paraparesis: A gradual weakening of the legs [6].
  • Hyperreflexia: Overactive or “jumpy” reflexes (like when the doctor taps your knee) [6].
  • Gait Changes: Difficulty lifting your toes (foot drop) or a tendency for your legs to cross over each other while walking (scissoring gait) [3].

The “Complex” Layer: Additional Symptoms

In complex forms of AD-HSP, the disease affects more than just the spinal cord’s motor pathways [3]. These additional symptoms can involve the brain, the nerves in your limbs, or even your eyes [9][10].

Important note: It is crucial to remember that because AD-HSP is highly variable, you are unlikely to develop all of the symptoms on this list [2].

  • Ataxia: Problems with balance and coordination, often caused by the cerebellum (the brain’s balance center) being affected [11][10].
  • Peripheral Neuropathy: Damage to the nerves outside the brain and spine, which can cause numbness, tingling, or “pins and needles” in the hands and feet [12][13].
  • Cognitive Changes: Some people may experience difficulties with memory, processing speed, or executive function. While severe cognitive issues like intellectual disability can be seen in early childhood-onset cases, adult-onset cases are more likely to experience only mild cognitive or memory changes over time [13][14].
  • Epilepsy: Recurrent seizures can occur in certain complex subtypes [13][15].
  • Vision and Hearing Loss: Some may experience optic atrophy (wasting of the eye’s optic nerve) or hearing impairment [9][10].

How the Disease Progresses

The progression of AD-HSP is typically slow, unfolding over many years or decades [6]. It is not a condition where symptoms appear overnight; rather, it is a gradual “wearing down” of the long nerve fibers in the spinal cord [16].

  • Variable Onset: Symptoms can begin at any age, from early childhood to late adulthood [2][17]. Even within the same family, one person might start having trouble walking at age 20, while another might not notice symptoms until age 50 [2].
  • The Mobility Timeline: Most people remain mobile for a long time. Progression usually moves from a slight limp or stiffness to needing a cane, then perhaps a walker, and eventually a wheelchair for longer distances [3][18].
  • The Role of Genetic Modifiers: Scientists have found that other small differences in your DNA (called genetic modifiers) can influence how early your symptoms start or how fast they move [17].

Because progression is gradual, many patients find that regular rehabilitation, such as physical therapy and balance training, can help manage symptoms and maintain independence for as long as possible [18][19].

Common questions in this guide

What are the first signs of complex AD-HSP?
The most common early signs are stiffness, tightness, or weakness in the leg muscles. You may also notice changes in how you walk, such as difficulty lifting your toes or a tendency for your legs to cross over each other.
What makes complex AD-HSP different from standard HSP?
While standard HSP primarily causes spasticity and weakness in the legs, complex AD-HSP affects other parts of the nervous system as well. This can lead to additional symptoms like balance problems, nerve pain in the hands and feet, vision changes, or cognitive issues.
How fast does complex AD-HSP progress?
Progression is typically very slow, unfolding gradually over many years or decades. Most people remain mobile for a long time, often slowly transitioning from a slight limp to needing mobility aids like a cane or a wheelchair as the disease advances.
Will I develop all the complex symptoms associated with AD-HSP?
It is highly unlikely that you will develop all the possible complex symptoms. AD-HSP is highly variable, meaning that the specific symptoms and their severity differ greatly from person to person, even among family members with the same genetic mutation.
How can I manage my AD-HSP symptoms?
While there is no cure, regular physical therapy, balance training, and rehabilitation are crucial for managing symptoms. These therapies help maintain strength, flexibility, and independence for as long as possible.

Questions to Ask Your Doctor

Curated prompts to bring to your next appointment.

  1. 1.Based on my genetic testing, which SPG type do I have and what is the typical progression for that specific type?
  2. 2.How can we monitor the 'complex' parts of my condition, such as my vision or peripheral nerve health, over the next year?
  3. 3.Are there specific balance or coordination tests (like for ataxia) we should perform during my visits?
  4. 4.Is my current level of spasticity typical for my stage of the disease, and what are our options if it increases?
  5. 5.Can you refer me to a physical therapist who has experience specifically with upper motor neuron disorders?

Questions For You

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References

References (19)
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    Association of an insertion mutation in PRRT2 with hereditary spastic paraplegia accompanied by polyneuropathy.

    Wang Z, Dong H, Ji X, et al.

    Journal of clinical laboratory analysis 2021; (35(6)):e23772 doi:10.1002/jcla.23772.

    PMID: 33826176
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    Cognitive dysfunction in hereditary spastic paraplegias and other motor neuron disorders.

    Faber I, Branco LMT, França Júnior MC

    Dementia & neuropsychologia 2016; (10(4)):276-279 doi:10.1590/s1980-5764-2016dn1004004.

    PMID: 29213469
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    Hereditary spastic paraplegia caused by compound heterozygous mutations outside the motor domain of the KIF1A gene.

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    Comprehensive Characterization of Spastic Paraplegia in Korean Patients: A Single-Center Experience over Two Decades.

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    Anaesthesia and orphan disease: Management of a case of Strumpell-Lorrain disease and review of the literature.

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    A Rare Homozygous AP4S1 Variant in Rwandan Siblings with Autosomal Recessive Hereditary Spastic Paraplegia Type 52 (SPG52).

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    Spinal cord stimulation improves motor function and gait in spastic paraplegia type 4 (SPG4): Clinical and neurophysiological evaluation.

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    Inherited metabolic diseases mimicking hereditary spastic paraplegia (HSP): a chance for treatment.

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    Identification of a novel MAG gene mutation with 22q11.21 microduplication linked to hereditary spastic paraplegia.

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    Ascending Axonal Degeneration of the Corticospinal Tract in Pure Hereditary Spastic Paraplegia: A Cross-Sectional DTI Study.

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This page provides general information about complex AD-HSP symptoms and progression. Always consult your neurologist or medical geneticist for advice tailored to your specific SPG type and symptoms.

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