Molecular and Cellular Mechanisms of Lysosomal Storage Diseases

Study Overview
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Brief Summary
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The lysosome is a specialized part of the cell that functions to degrade metabolic wastes in the cell. Defects in the functioning of the lysosome result in accumulation and subsequent storage of such metabolic wastes. These defects lead to conditions known as lysosomal storage diseases (LSD). LSDs are caused by inherited genetic mutations and there are over 40 genetically distinct lysosomal storage diseases. Within each specific lysosomal storage disease there are variances in severity of disease, age of onset, and clinical presentation. Though the genetic mutations contributing to the disease have been largely clarified, the molecular and cellular mechanisms that contribute to variations in each distinct LSD remain unclear. With this study we intend to better understand at the cellular and molecular level how the accumulation and storage of metabolic wastes in the lysosome affect the clinical manifestation of LSDs, to detect changes in these mechanisms upon treatment administration, and to correlate these results to genetic information. The knowledge obtained from this research study could lead to better ways to diagnose and treat lysosomal storage diseases.

Official Title
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Investigation of Molecular and Cellular Mechanisms of Lysosomal Storage Diseases

Conditions
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Lysosomal Storage Disorders

Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Subject is greater than or equal to 1 day of age and less than or equal to 100 years of age Signed Informed Consent/Assent Subject is able and willing to comply with study protocol requirements. From clinical or blood laboratory findings subject has evidence of a lysosomal storage disease or a family member of a patient with lysosomal storage disease Exclusion Criteria: Pregnant woman

Ages Eligible for Study
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Minimum Age: 1 Day
Maximum Age: 100 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Correlating genetic mutations with clinical signs and symptoms | Genetic information (DNA) will be collected from biological samples (e.g. blood, skin cells) and correlated with clinical signs and symptoms. DNA will be sequenced in order to identify a specific mutation. Fluorescence assay will be performed to measure the enzyme activity of the affected protein. Physical examination will be performed, and supporting test results will be collected for identifying the signs and symptoms of the particular disorder. | 5 years | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Associated Immune Pathophysiology | Blood will be collected for identifying alterations in the innate and adaptive immune system. Flow cytometry will be used to analyze cell surface and intracellular biomarkers on immune cells such as B-cells, T-cells, eosinophils. | 5 years | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Gaucher disease, Fabry disease, Pompe disease, Niemann-Pick disease