Biomarker for GM1/GM2 - Gangliosidoses (BioGM1BioGM2)

Tracking Information
First Submitted Date	October 23, 2014
First Posted Date	November 24, 2014
Last Update Posted Date	July 3, 2018
Study Start Date	November 2014
Actual Primary Completion Date	July 2018 (Final data collection date for primary outcome measure)
Current Primary Outcome Measures; (submitted: November 19, 2014)	Development of a new MS-based biomarker for the early and sensitive diagnosis of GM1/GM2 -gangliosidoses from plasma and saliva using [ Time Frame: 36 month ]
Original Primary Outcome Measures	Same as current
Change History	Complete list of historical versions of study NCT02298647 on ClinicalTrials.gov Archive Site
Current Secondary Outcome Measures; (submitted: November 19, 2014)	Testing for clinical robustness, specificity and long-term stability of the biomarker [ Time Frame: 36 month ]
Original Secondary Outcome Measures	Same as current
Current Other Outcome Measures	Not Provided
Original Other Outcome Measures	Not Provided
Descriptive Information
Brief Title	Biomarker for GM1/GM2 - Gangliosidoses
Official Title	Biomarker for GM1/GM2-Gangliosidoses - AN INTERNATIONAL, MULTICENTER, EPIDEMIOLOGICAL PROTOCOL
Brief Summary	Development of a new MS-based biomarker for the early and sensitive diagnosis of metachromatic leukodystrophy disease from plasma and saliva. Testing for clinical robustness, specificity and long-term stability of the biomarker.
Detailed Description	Gangliosides are complex compunds consisting of a glycosphingolipid and a sialic acid and are located at the cell surface where they are responsible for detecting extracellular mole-cules. Gangliosides are mainly located in the nervous system. If gangliosides accumulate pathologically throughout the body this is known as gangliosidoss. There are two main sub-types of gangliosidosis depending on the deficient enzyme, which are known as GM1 and GM2. GM1-Gangliosidosis GM1 gangliosidosis is an autosomal recessive disease. Genetic counselling should be pro-vided to affected families. The disorder is caused by mutations in the GLB1-gene coding for beta-galactosidase. To day, more than 165 mutations have been identified. Deficient enzyme activity leads to toxic accumulation of gangliosides in body tissues, and particularly in the central nervous system (CNS). The disorder is panethnic however the worldwide prevalence is not known. Prevalence at birth is estimated to be approximately 1:100,000 to 200,000 live births. High prevalence has been found in Malta and Brazil, and in the Cypriot and Roma populations. Deficiency of the lysosomal hydrolase, acid β-galactosidase, causes GM1.Three clinical sub-types of GM1 gangliosidosis are recognized, classified by age of onset, as follows: Infantile (type 1): In the most common infantile form, coarse facial features, hepato-splenomegaly, generalized skeletal dysplasia (dysostosis multiplex), macular cherry-red spots, and developmental delay/arrest (followed by progressive neurologic deteri-oration) usually occur within the first 6 months of life. Nonimmune hydrops fetalis has been reported. An increased incidence of Mongolian spots has also been described. A wide spectrum of variability is observed in the appearance and progression of the typical dysmorphic features. As many as 50% of affected infants have a macular cherry-red spot.; Juvenile (type 2): The juvenile form is characterized by a later age of onset, less hepatosplenomegaly (if any), fewer cherry-red spots (if any), dysmorphic features, or skeletal changes (vertebral dysplasia may be detected radiographically).; Adult (type 3): The adult form is characterized by normal early neurologic develop-ment, with variable age of clinical presentation. Slowly progressing dementia with parkinsonian features and extrapyramidal disease is common. Intellectual impairment may be initially absent or mild but progresses with time. Generalized dystonia with speech and gait disturbance is the most frequently reported early feature. Typically, no hepatosplenomegaly, cherry-red spots, dysmorphic features, or skeletal changes are present aside from scoliosis (mild vertebral changes may be revealed with radiog-raphy), but short stature is common. GM2-Gangliosidosis The GM2 gangliosidosis are a group of lysosomal lipid storage disorders caused by mutations in at least 1 of 3 recessive genes: HEXA, HEXB, and GM2A. Normal products of all 3 genes are required for normal catabolism of the GM2 ganglioside substrate. Deficient activity of these enzymes leads to accumulation of the substrate inside neuronal lysosomes, leading to cell death. The products of the 3 genes are, respectively, the alpha subunits of b-hexosaminidase A (Hex A). Hex A is a dimer and has the structure alpha-beta. β-Hexosaminidase B (Hex B) is a dimer of beta chains. It hydrolyzes GM2 and its neutral asialo derivative GA2. Both subunit precursors acquire the mannose 6-phosphate marker for recognition by lysosomes. Hexosaminidase S (Hex S) is a dimer of alpha chains; it is a normal constituent of plasma and degrades a wide range of glycoconjugates containing β-linked N-acetylhexosaminyl res-idues. With lack of beta-subunits the increased polymerization of alpha subunits leads to the increased formation of Hex S in Tay - Sachs disease. GM2A is a cofactor required for the normal function of Hex A; it´s disruption likewise leads to a reduced function of Hex A. New methods, like mass-spectrometry give a good chance to characterize specific metabolic alterations in the blood (plasma) of affected patients that allow diagnosing in the future the disease earlier, with a higher sensitivity and specificity. Therefore it is the goal of the study to validate this new biochemical marker from the plasma of the affected patients helping to benefit other patients by an early diagnose and thereby with an earlier treatment. Examining saliva samples will allow determining whether measurement is feasible in saliva samples and will further promote early detection of GM1/GM2 disease.
Study Type	Observational
Study Design	Observational Model: Cohort; Time Perspective: Prospective
Target Follow-Up Duration	Not Provided
Biospecimen	Retention: Samples With DNA; Description: For the development of the new biomarkers using the technique of Mass-spectometry 10ml EDTA blood, sputum tube and a dry blood spot filter card are taken. To proof the correct diagnosis in those patients where up to the enrollment in the study no genetic testing has been done, sequencing will be done. The analyses are done in the Albrecht-Kossel-Institute for Neuroregeneration (AKos), POB 100 888, Gehlsheimer Str. 20, 18055 Rostock (Germany)
Sampling Method	Probability Sample
Study Population	Patients with GM1/GM2- Gangliosidoses or high-grade suspicion for GM1/GM2 -Gangliosidoses
Condition	Gangliosidosis; GM1-Gangliosidosis; GM2-Gangliosidosis; Hexosaminidase Activator Deficiency; Tay-Sachs Disease, AB Variant; Hexosaminidase A and B Deficiency; Sandhoff Disease
Intervention	Not Provided
Study Groups/Cohorts	Observation; Patients with a diagnosis of Gangliosidosis type GM1/GM2 based upon biochemical and/or genetic criteria or profound suspicion for Gangliosidosis type GM1/GM2
Publications *	Not Provided
* Includes publications given by the data provider as well as publications identified by ClinicalTrials.gov Identifier (NCT Number) in Medline.
Recruitment Information
Recruitment Status	Active, not recruiting
Actual Enrollment; (submitted: July 1, 2018)	137
Original Estimated Enrollment; (submitted: November 19, 2014)	50
Estimated Study Completion Date	July 2018
Actual Primary Completion Date	July 2018 (Final data collection date for primary outcome measure)
Eligibility Criteria	Inclusion Criteria: Informed consent will be obtained from the parents before any study related proce-dures.; Patients of both genders aged 2 months and older; The patient has a diagnosis of GM1/GM2 -gangliosidoses or a high-grade suspicion for GM1/GM2 -gangliosidoses High-grade suspicion for GM1 or GM2 pre-sent, if one or more inclusion criteria are valid: Positive family anamnesis for GM1 or GM2 disease; Neurodegenerative symptoms; Skeletal symptoms; Cherry Red Spot Exclusion Criteria: No Informed consent from the parents be-fore any study related procedures.; No diagnosis of GM1/GM2 disease or no valid criteria for profound suspicion of GM1/GM2 -disease; Patients of both genders younger than 2 months
Sex/Gender	Sexes Eligible for Study: All
Ages	2 Months and older (Child, Adult, Older Adult)
Accepts Healthy Volunteers	No
Contacts	Contact information is only displayed when the study is recruiting subjects
Listed Location Countries	Germany
Removed Location Countries
Administrative Information
NCT Number	NCT02298647
Other Study ID Numbers	BGM 03-2014
Has Data Monitoring Committee	Yes
U.S. FDA-regulated Product	Not Provided
IPD Sharing Statement	Plan to Share IPD: Undecided
Responsible Party	Prof. Dr. Arndt Rolfs, University of Rostock
Study Sponsor	University of Rostock
Collaborators	Centogene AG Rostock
Investigators	Principal Investigator: Arndt Rolfs, Prof. University of Rostock, Albrecht-Kossel-Institute for Neuroregeneration
PRS Account	University of Rostock
Verification Date	July 2018