Pyruvate Kinase Deficiency Inheritance Pattern

Pyruvate kinase deficiency is a condition that affects red blood cells, leading to reduced ATP production and a chronic haemolytic anaemia. This means red blood cells break down prematurely.

Understanding Autosomal Recessive Inheritance

The inheritance pattern for pyruvate kinase deficiency is autosomal recessive. This means:

• Autosomal: The gene responsible for pyruvate kinase is located on one of the non-sex chromosomes (autosomes). Inheritance is not linked to gender.
• Recessive: An individual must inherit two copies of the mutated gene (one from each parent) to develop the disorder. People with only one copy of the mutated gene are carriers but typically do not show symptoms.

Why Other Modes Are Incorrect

The disorder is not typically inherited as:

• X-linked recessive/dominant: These involve mutations on the X chromosome, which affect males and females differently. Pyruvate kinase deficiency is not X-linked.
• Autosomal dominant: In this pattern, only one copy of the mutated gene is needed to cause the disorder. Pyruvate kinase deficiency requires two mutated copies.

Therefore, pyruvate kinase deficiency primarily results from inheriting two copies of a defective gene on an autosome, classifying it as an autosomal recessive trait.