Lysosomal Storage Disorder (LSD) is a cluster of over 70 metabolic diseases which are hereditary and are occurred due to lysosomal de positioning. Lysosomes are cellular structures that are tiny and composed of enzymes that aid in the digestion of complex molecules (e.g., proteins, fats, and sugars). In LSDs, a genetic mutation causes a loss or abnormality in one of these enzymes (or related proteins), which causes undigested materials in lysosomes. This accumulation gradually destroys cells, organs and tissues.
Causes
Mutations in the genes (normally recognized as a form of autosomal recessive inheritance, Fabry and Hunter diseases are X-linked).
Failure of or deficiency of lysosomal enzymes, transport proteins or activators.
Lysosomal storage disease treatment in India
This is a summary of Lysosomal Storage Disorder (LSD) therapy in India, relative to treatment choices:
Such treatments are usually made available through the pharmaceutical company sponsored compassionate access programs such as Sanofi-Genzyme and Takeda. Such initiatives were reported to have administered ERT on more than 200 Indian patients in 2017.
A retrospective study cites somewhat limited but not insignificant access: approximately 60 Gaucher patients and 20 MPS I, a small numbers of Fabry patients, and classic infantile Pompe patients have been treated through programs like INCAP, but it is difficult to gain access to MPS II and VI patients.
Hematopoietic Stem Cell Transplant (H-S-T)
As an option, HSCT can be offered in carefully chosen LSDs, predominantly MPS I and sometimes (but not all) MPS II, Gaucher disease, Krabbe, etc. Nonetheless, Indian data on HSCT are scant, and results may be different due to donor matching, transplant-associated complications, and disease progression
Palliative Care & Prevention
Management includes where there are certain unavailable or inaccessible therapies:
Multidisciplinary (genetic, neurological, pediatric, orthopedic, cardiology, rehabilitation) support of specialists
Genetic counselling, in addition to prenatal diagnosis (PND), has existed in India since at least the 1970s and may provide both early intervention and the opportunity to make informed choices about at-risk pregnancies
Lysosomal storage disorder symptoms
LSDs can lead to a broad array of symptoms due to the fact that various enzymes and different organs are involved in each particular type. As there are 70+ LSDs, the symptoms may differ, however there is a number of clinical features that are at common.
General Symptoms of LSDs
Developmental delay/regression (acquiring skills development loss)
Rough facial characteristics (thickened lips, large nose, bulky tongue on some versions)
Abnormally large liver and spleen (hepatosplenomegaly)
Bone malformations (dwarfing, bone stiffness and deformities, bone dysostosis multiplex)
LSDs are a broad category of inherited metabolic disorders 70+ types are known to exist. They are categorized according to the kind of molecule that builds up in the lysosomes because of deficiency in enzymes or transporters.
The list below is a categorized set of the primary kinds of LSDs:
Sphingolipidoses (malfunction of the breakup of the sphingolipid)
Glucocerebrosidase deficiency- Gaucher disease – accumulation of glucocerebroside
Niemann-Pick disease (Types A, B, C) defect transport of sphingomyelin or transport of cholesterol in cells → accumulation of sphingomyelin / cholesterol
Tay-Sachs disease -deficient hexosaminidase A- accumulation of GM2 ganglioside
Sandhoff disease - hexosaminidase A and B deficiency -> Stacking up of GM2 gangliosides
Fabry disease (deficiency of α-galactosidase A) glycobiology • Accumulation of globotriaosylceramide
Krabbes disease: deficiency of the Galactosidase Cerebroside → accumulation of galactocerebroside and psychosine
Metachromatic leukodystrophy (MLD) -arylsulfatase A deficiency -the accumulation of sulfatide
Factors Affecting Affordable lysosomal storage disorder treatment in India
It is indeed a critical question, as treatment of Lysosomal Storage Disorders (LSDs) is very expensive in India and affordability is the most problematic. The following are the factors that influence the affordability:
Exorbitant prices of Enzyme Replacement Therapy (ERT)
Treatment is lifelong hence expensive to treat the children with age.
This is something only a few Indian families even can afford with outside help.
Reliance on Compassionate / Corporate Programs
There are pharma-sponsored programs of compassionate use wherein many patients have access to drugs (e.g., Sanofi Genzyme, Takeda).
It is not universal since it varies depending on the criteria that a company adopts.
Lack of assurance of continuation provides financial insecurity to the family.
Geographic /Center of excellence (COE) Access
Special treatment is confined within a handful of COEs.
Families in the distant regions incur travel, lodging and follow up expenses on top of the financial strain.
Diagnostic Tests
Low doctor awareness levels, a lack of newborn screening and a small number of testing facilities contribute to late diagnoses in many LSDs.
The level of disease is frequently more advanced in cases of late diagnosis thus necessitating more demanding (and expensive) measures.
Support Care Expenses
In addition to ERT/HSCT, patients need:
Care with multidisciplinary (neurology, orthopedics, cardiology, physiotherapy)
Procedures (airway, orthopedic corrections)
Orthoses devices, rehabilitators and food assistance
All these increments place a very weighty financial burden.
Costs of Stem Cell transplant (HSCT)
In some of the LSDs (e.g. MPS I, Krabbe), HSCT may be an option.
Possibility of complications complicates affordability even further (repeat hospitalizations, ICU care).
Lysosomal storage disorder treatment in India by GetWellGo
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