What is Glucose-6-Phosphate Dehydrogenase Deficiency G6pd

Glucose-6-Phosphate Dehydrogenase Deficiency (G6PD deficiency) is a common genetic condition where the body lacks enough of an enzyme that protects red blood cells from damage, often leading to hemolytic anemia when triggered by certain medications, infections, or foods. While most individuals live healthy lives, they must avoid specific environmental triggers to prevent the premature destruction of their red blood cells.

What causes Glucose-6-Phosphate Dehydrogenase Deficiency?

The underlying mechanism of Glucose-6-Phosphate Dehydrogenase Deficiency involves a mutation in the G6PD gene, which provides instructions for making the G6PD enzyme. This enzyme is essential for maintaining the stability of red blood cells by neutralizing harmful molecules called reactive oxygen species. When an individual has Glucose-6-Phosphate Dehydrogenase Deficiency, their red blood cells become vulnerable to oxidative stress, which can cause them to rupture, a process known as hemolysis.

Who is most affected by G6PD Deficiency?

Glucose-6-Phosphate Dehydrogenase Deficiency is the most common human enzyme deficiency, affecting an estimated 400 million people worldwide. It is an X-linked recessive condition, meaning it predominantly affects males. Its prevalence is highest in populations from Africa, the Mediterranean, and Southeast Asia, likely due to an evolutionary protective effect against malaria.

How is Glucose-6-Phosphate Dehydrogenase Deficiency classified?

The World Health Organization classifies Glucose-6-Phosphate Dehydrogenase Deficiency into five classes based on the severity of enzyme activity and the nature of the resulting hemolysis:

• Class I: Severe deficiency with chronic non-spherocytic hemolytic anemia.


• Class II: Severe deficiency (less than 10% activity) with intermittent hemolysis.


• Class III: Moderate deficiency (10-60% activity).


• Class IV & V: Mild or no clinical symptoms, as enzyme activity is near normal or increased.

Key facts about living with the condition

Unlike other forms of anemia, Glucose-6-Phosphate Dehydrogenase Deficiency is often asymptomatic until a trigger occurs. Common triggers include fava beans (favism), certain antibiotics, and antimalarial drugs. Currently, 12 people with Glucose-6-Phosphate Dehydrogenase Deficiency have joined the DiseaseMaps community to share their experiences and strategies for avoidance.

Next steps

• Consult a hematologist or genetic counselor to confirm your specific variant and risk profile.


• Maintain an updated list of "avoidance" medications and foods to share with all healthcare providers.


• Join the DiseaseMaps community to connect with others managing this condition.


• Seek immediate medical attention if you experience signs of jaundice, dark urine, or extreme fatigue.

Medical disclaimer: This information is for educational purposes only and does not constitute professional medical advice, diagnosis, or treatment.

References

• NIH Genetic and Rare Diseases Information Center (GARD): G6PD Deficiency.


• Orphanet: G6PD Deficiency.


• OMIM (Online Mendelian Inheritance in Man): Glucose-6-Phosphate Dehydrogenase Deficiency.


• World Health Organization (WHO): G6PD Deficiency guidelines.