Natural History Study of Synucleinopathies

This study is currently recruiting participants. (see Contacts and Locations)
Verified November 2015 by New York University School of Medicine
Information provided by (Responsible Party):
New York University School of Medicine Identifier:
First received: February 25, 2013
Last updated: November 11, 2015
Last verified: November 2015

February 25, 2013
November 11, 2015
June 2011
July 2020   (final data collection date for primary outcome measure)
To create a database of primary autonomic disorders that will serve as a phenotyping core. [ Time Frame: 5 years ] [ Designated as safety issue: No ]
We will create an enrollment database of patients with primary autonomic disorders. All patients will have standardized phenotyping evaluations that will combine clinical, physiological and biochemical strategies to characterize complex autonomic phenotypes, both known and still undiscovered.
Same as current
Complete list of historical versions of study NCT01799915 on Archive Site
To define the natural history of neurogenic orthostatic hypotension and identify predictive biomarkers of autonomic disorders [ Time Frame: 5 years ] [ Designated as safety issue: No ]
We will map the natural history of primary autonomic failure and test the hypothesis that pure autonomic failure (PAF) is a neurodegenerative synucleinopathy that remains confined to the autonomic nervous system. We will also identify biomarkers that can distinguish patients with PAF from those with early (i.e., "pre-motor") MSA, PD, DLB or autonomic failure as a result of another disorder.
Same as current
Not Provided
Not Provided
Natural History Study of Synucleinopathies
Natural History Study of Synucleinopathies

Synucleinopathies are a group of rare diseases associated with worsening neurological deficits and the abnormal accumulation of the protein α-synuclein in the nervous system. Onset is usually in late adulthood at age 50 or older. Usually, synucleinopathies present clinically with slowness of movement, coordination difficulties or mild cognitive impairment. Development of these features indicates that abnormal alpha-synuclein deposits have destroyed key areas of the brain involved in the control of movement or cognition. Patients with synucleinopathies and signs of CNS-deficits are frequently diagnosed with Parkinson disease (PD), dementia with Lewy bodies (DLB) or multiple system atrophy (MSA).

However, accumulation of alpha-synuclein and death of nerve cells can also begin outside the brain in the autonomic nerves. In such cases, syncucleinopathies present first with symptoms of autonomic impairment (unexplained constipation, urinary difficulties, and sexual dysfunction). In rare cases, hypotension on standing (a disorder known as orthostatic hypotension) may be the only clinical finding. This "pre-motor" autonomic stage suggests that the disease process may not yet have spread to the brain.

After a variable period of time, but usually within 5-years, most patients with abnormally low blood pressure on standing develop cognitive or motor abnormalities. This stepwise evolution indicates that the disease spreads from the body to the brain. Another indication of this spread is that acting out dreams (i.e., REM sleep behavior disorder, RBD) a problem that occurs when the lower part of the brain is affected, may also be the first noticeable sign of Parkinson disease.

The purpose of this study is to document the clinical features and biological markers of patients with synucleinopathies and better understand how these disorders evolve over time. The study will involve following patients diagnosed with a synucleinopathy (PD/DLB and MSA) and those believed to be in the "pre-motor" stage (with isolated autonomic impairment and/or RBD). Through a careful series of follow-up visits to participating Centers, we will focus on finding biological clues that predict which patients will develop motor/cognitive problems and which ones have the resilience to keep the disease at bay preventing spread to the brain. We will also define the natural history of MSA - the most aggressive of the synucleinopathies.

α-synuclein is a small protein of 140 amino acids that is highly expressed in the brain. It's function remains poorly understood.10 Synucleinopathies are a group of neurodegenerative diseases associated with the abnormal accumulation of α-synuclein within cytoplasmic inclusions in neurons or oligodendroglia. These α-synuclein containing cytoplasmic aggregates occur throughout the brain, producing cell death and specific motor, autonomic and cognitive dysfunction in four phenotypically distinct synucleinopathies. When α-synuclein deposition occurs in neurons it aggregates into Lewy bodies, producing Parkinson disease (PD), dementia with Lewy bodies (DLB) or pure autonomic failure (PAF). Whereas in multiple system atrophy (MSA) neuronal death probably occurs as a consequence of α-synuclein aggregation in oligodendroglia.

A characteristic feature of the synucleinopathies is that they can all begin with varying degrees of autonomic dysfunction as the sole clinical feature - implying an initial diagnosis of isolated (pure) autonomic failure 11. After a variable period of time, but usually less than 5 years, only a small number of patients remain with a pure autonomic failure phenotype, but careful follow-up is lacking 11. Most patients develop cognitive or motor abnormalities (or both) and the patient is then diagnosed with PD, DLB or MSA.

This stepwise clinical progression suggests that the neurodegenerative process can in rare cases remain confined to autonomic neurons12, but more frequently spreads to affect additional areas of the central nervous system (CNS). This unique feature of the synucleinopathies poses diagnostic challenges and potential therapeutic opportunities.

The challenges are first, to determine whether PAF is a distinct disease or is always a prodromal phase of PD, DLB or MSA and second, to discover biomarkers that predict spread to motor and cognitive neurons. Such biomarkers would allow testing of disease-modifying strategies to delay or stop the neurodegenerative process in the pre-motor or pre-dementia phase. Aim 2 will focus on defining the natural history of MSA, the most aggressive of the synucleinopathies. This prospective observational study will establish disease-specific milestones for use in future clinical trials.

Obstacles to identifying biomarkers predicting further CNS involvement are that most medical centers only see patients with synucleinopathies when they already have developed motor and cognitive involvement, and that PAF and MSA are rare disorders. In this context the Autonomic Disorders Consortium (ADC) within the Rare Diseases Clinical Research Network (RDCRN) of the National Institutes of Health (NIH) was created with the objective of providing a better understanding of the variability, progression, and natural history of neurodegenerative synucleinopathies. Continuing this observational study, and increasing its power by including additional academic centers from the U.S., South America, and Europe, will allow us to define the natural history of these diseases and establish the sensitivity and specificity of the proposed biomarkers.

Observational Model: Cohort
Time Perspective: Prospective
Not Provided
Retention:   Samples With DNA
Blood Sample for DNA processing
Non-Probability Sample
Primary autonomic disorders are a group of diseases that usually begin in adulthood with the inability to stand because of dizziness, lightheadedness and fainting. Symptoms are the result of a dysfunction in the autonomic nerves that regulate blood pressure and heart rate, and are either related to the accumulation of abnormal protein deposits and a primary neurodegenerative process (like Parkinson's disease, pure autonomic failure, dementia with Lewy bodies and multiple system atrophy), secondary to genetic abnormalities (dopamine-beta-hydroxylase deficiency), an autoimmune process (autoimmune ganglionopathy), or because of a direct injury to the nerves involved in buffering blood pressure fluctuations (acquired baroreflex failure).
Patients With Synucleinopathies
Not Provided
  • REM sleep behavior disorder, RBD
    Patients that have rapid eye movement sleep behavior disorder.
  • multiple system atrophy
    is a neurodegenerative disorder charaterized by abnormal alpha-synuclein deposition in the cytoplasm of oligodendroglial cells in the CNS, and typically sparing peripheral autonomic nerves.
  • Pure Autonomic failure
    A neurodegenerative disorder characterized by loss of peripheral noradrenergic fibers, with low levels of plasma norepinephine.
  • Parkinson disease
    A degenerative disorder of the central nervous system that leads to termors, difficulty walking, movement and coordination.
  • Dementia with Lewy bodies
    A neurodegenerative disorder similar to PAF and PD with the accumulation of Alpha-synuclein in the CNS however DLB patients develop dementia.
Not Provided

*   Includes publications given by the data provider as well as publications identified by Identifier (NCT Number) in Medline.
July 2020
July 2020   (final data collection date for primary outcome measure)

Inclusion Criteria:

  1. Both male and female patients will be included
  2. Aged 18 or over
  3. Referred to any of the participating consortium sites with orthostatic intolerance, defined as symptoms of dizziness or lightheadedness in the standing position that disappear when supine.

Exclusion Criteria:

  1. Diabetes according to the American Diabetes Association criteria
  2. Congestive heart failure
  3. Lupus or other collagen vascular disease
  4. Systemic illness thought to be responsible for the orthostatic intolerance
  5. Drug-induced orthostatic hypotension (i.e., the use of alpha-blockers, diuretics, tricyclic antidepressants or others thought by the investigator to play an important role in the patient's orthostatic hypotension)
  6. Isolated vasovagal syncope
  7. Inability to comply with the protocol, e.g. uncooperative attitude, inability to return for follow-up visits, and unlikelihood of completing the study.
18 Years and older
United States
New York University School of Medicine
New York University School of Medicine
Not Provided
Principal Investigator: Horacio C Kaufmann, MD NYU MEDICAL CENTER
New York University School of Medicine
November 2015

ICMJE     Data element required by the International Committee of Medical Journal Editors and the World Health Organization ICTRP