Biomarker for Mannosidosis Disease (BioMannosidosis)

Alpha-Mannosidase B Deficiency Clinical Trial

— BioMannosido  

Official title:

Biomarker for Mannosidosis Disease - An International, Multicenter, Epidemiological Protocol

Clinical Trial Details — Status: Withdrawn

Administrative data

• NCT number: NCT03264040
• Other study ID #: BMA 06-2018
• Status: Withdrawn
• Start date: August 20, 2018
• Est. completion date: February 28, 2021

Study information

• Verified date: February 2023
• Source: CENTOGENE GmbH Rostock
• Contact: n/a
• Is FDA regulated: No
• Study type: Observational

Clinical Trial Summary

Development of a new MS-based biomarker for the early and sensitive diagnosis of Mannosidosis disease from blood (plasma)

Description:

Alpha-Mannosidosis is a rare lysosomal storage disorder of the Glycoprotein family of diseases and is closely related to Mucopolysaccharidoses.

Alpha-Mannosidosis was first described by Dr Oekerman, from Lund in Sweden in 1967. There is another variant known as Beta-Mannosidosis, which is extremely rare and has produced a wide range of clinical abnormalities in the few patients described with this disorder.

A Alpha-Mannosidosis is a rare inherited disorder that causes problems in many organs and tissues of the body. Affected individuals may have intellectual disability, distinctive facial features, and skeletal abnormalities. Characteristic facial features can include a large head, prominent forehead, low hairline, rounded eyebrows, large ears, flattened bridge of the nose, protruding jaw, widely spaced teeth, overgrown gums, and large tongue. The skeletal abnormalities that can occur in this disorder include reduced bone density (osteopenia), thickening of the bones at the top of the skull (calvaria), deformations of the bones in the spine (vertebrae), bowed legs or knock knees, and deterioration of the bones and joints.

Affected individuals may also experience difficulty in coordinating movements (ataxia); muscle weakness (myopathy); delay in developing motor skills such as sitting and walking; speech impairments; increased risk of infections; enlargement of the liver and spleen (hepatosplenomegaly); a buildup of fluid in the brain (hydrocepha-lus); hearing loss; and a clouding of the lens of the eye (cataract). Some people with Alpha-Mannosidosis experience psychiatric symptoms such as depression, anxiety, or hallucinations; episodes of psychiatric disturbance may be triggered by stressors such as having undergone surgery, emotional upset, or changes in routine.

The signs and symptoms of Alpha-Mannosidosis can range from mild to severe. The disorder may appear in infancy with rapid progression and severe neurological deterioration. Individuals with this early-onset form of Alpha-Mannosidosis often do not survive past childhood. In the most severe cases, an affected fetus may die before birth. Other individuals with Alpha-Mannosidosis experience milder signs and symptoms that appear later and progress more slowly. People with later-onset alpha-mannosidosis may survive into their fifties. The mildest cases may be detected only through laboratory testing and result in few if any symptoms.

Alpha-mannosidosis is estimated to occur in approximately 1 in 500,000 people worldwide.

Mutations in the MAN2B1 gene cause Alpha-Mannosidosis. This gene provides instructions for making the enzyme alpha-mannosidase. This enzyme works in the lysosomes, which are compartments that digest and recycle materials in the cell. With-in lysosomes, the enzyme helps break down complexes of sugar molecules (oligo-saccharides) attached to certain proteins (glycoproteins). In particular, alpha-mannosidase helps break down oligosaccharides containing a sugar molecule called mannose.

Mutations in the MAN2B1 gene interfere with the ability of the alpha-mannosidase enzyme to perform its role in breaking down mannose-containing oligosaccharides. These oligosaccharides accumulate in the lysosomes and cause cells to malfunction and eventually die. Tissues and organs are damaged by the abnormal accumulation of oligosaccharides and the resulting cell death, leading to the characteristic features of Alpha-Mannosidosis.

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 identify and validate a 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.

Recruitment information / eligibility

• Status: Withdrawn
• Enrollment: 0
• Est. completion date: February 28, 2021
• Est. primary completion date: February 28, 2021
• Gender: All
• Age group: 2 Months and older

Eligibility

Inclusion Criteria:

• Informed consent will be obtained from the patient or the parents before any study related procedures.

• Patients of both genders older than 2 months

• The patient has a diagnosis of Alpha-Mannosidosis disease or a high grade suspicion for Alpha-Mannosidosis disease

• High grade suspicion present, if one or more inclusion criteria are valid:

• Positive family anamnesis for Alpha-Mannosidosis disease

• rounded eyebrows

• large head

• large ears

• flattened bridge of the nose

• deformations of the bones in the spine (vertebrae)

Exclusion Criteria:

• No Informed consent from the patient or the parents before any study related procedures.

• Patients of both gender younger than 2 months

• No diagnosis of Alpha-Mannosidosis disease or no valid criteria for profound suspicion of Alpha-Mannosidosis disease

Related Conditions & MeSH terms

• Alpha-Mannosidase B Deficiency
• Alpha-Mannosidase Deficiency
• alpha-Mannosidosis
• Lysosomal Alpha B Mannosidosis

Locations

Country	Name	City	State
Germany	Centogene GmbH	Rostock
India	Navi Mumbai Institute of Research In Mental And Neurological Handicap (NIRMAN)	Mumbai
Sri Lanka	Lady Ridgeway Hospital for Children	Colombo 8

Sponsors (1)

Lead Sponsor	Collaborator
CENTOGENE GmbH Rostock

Countries where clinical trial is conducted

Germany,  India,  Sri Lanka, 

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	Development of a new MS-based biomarker for the early and sensitive diagno-sis of Mannosidosis disease from blood (plasma)	New methods, like mass-spectrometry give a good chance to characterize specific metabolic alterations in the blood of affected patients that allow diagnosing in the future the disease earlier, with a higher sensitivity and specificity.	24 months
Secondary	Testing for clinical robustness, specificity and long-term stability of the bi-omarker	the goal of the study to identify and validate a new biochemical marker from the blood of the affected patients helping to benefit other patients by an early diagnose and thereby with an earlier treatment.	36 months

External Links

•   Centogene is one of the leading laboratories focusing on genetic testing for rare hereditary disorders. We now offer more than 2200 routine genetic and biochemical tests.