Movie day extraordinary measures

Glycogen storage disorders (GSDs) are inherited metabolic diseases that affect the body's ability to store and use glycogen, a form of glucose.
The movie Extraordinary Measures is based on a true story concerning this disorder and stars Harrison Ford.

Glycogen: A polysaccharide stored in the body; it serves as a major carbohydrate reserve.
Glucose: A simple sugar that is a primary energy source for the body.
Glycogen is formed by linking glucose monomers into branched chains, primarily stored in
- Skeletal Muscle: Energy source for muscle contractions.
- Liver: Regulates blood glucose levels.
Glycogen can be broken down back into glucose when energy is needed, especially during exercise or fasting.

Glycolysis: The biochemical process of breaking down glucose into pyruvate, enabling the extraction of energy.
The process occurs in the cytosol of the cell, demonstrating the metabolic pathways of glucose utilization.
Enzymes regulate the steps of glycolysis and glycogen breakdown.

Caused by mutations in genes coding for enzymes involved in glycogen metabolism.
There are over 15 different types of GSDs, each named after the individual who first reported them or discovered the disorder.
Mutations may affect
- Glucose breakdown
- Glucose transport
Patients with these conditions can have a range of symptoms based on the type and severity of the disorder.

Pompe Disease (Type II): Caused by deficiency in the enzyme GAA and is characterized by muscle weakness and respiratory issues.
McArdle Disease (Type V): Affects the breakdown of glycogen to glucose-1-phosphate.
Disease manifestations vary widely due to the heterogeneity of the genetic mutations.

Heterogeneity: Refers to the presence of variations across different genes causing the same disorder; for GSDs, mutations can occur in different genes leading to various types of the disorder.
Recessive Inheritance: Most GSDs are inherited in a recessive manner; both alleles must be mutated for the disorder to manifest.
Genetic Complementation: When two affected parents have children who are unaffected because they have mutations in different genes.
Expressivity: Variability in the severity or phenotype of individuals with the same genetic disorder, depending on the specific mutation.

Each step in the pathway contributes to how glycogen is stored and utilized by the body.
The absence of functional enzymes at any step can lead to the accumulation of glycogen or other intermediate products, resulting in clinical symptoms.
Understanding these metabolic pathways is crucial for developing treatments and therapies for the various types of GSDs.

Importance of understanding both the biochemical and genetic aspects of GSDs for effective treatment.
The role of research and advocacy in improving outcomes for affected families, as shown in the movie.
Students are encouraged to consider the implications of enzyme deficiencies, genetic mutations, and their impact on families living with these disorders.