Genetic diversity in human erythrocyte pyruvate kinase

Area of Science:

• Genetics
• Parasitology
• Human Evolution

Background:

• Pyruvate kinase, liver and red cell isoform (PKLR) deficiency has been previously shown to confer protection against malaria in mouse models and human red blood cells.
• Understanding the genetic basis of PKLR variations is crucial for comprehending host-parasite interactions in malaria-endemic regions.

Purpose of the Study:

• To investigate the genetic diversity of the human PKLR gene across different geographical and ethnic groups.
• To identify potential genetic adaptations in PKLR related to malaria endemicity.

Main Methods:

• Sequencing of the human PKLR gene in 387 individuals from diverse geographical locations.
• Analysis of single-nucleotide polymorphisms (SNPs) and loss-of-function variants.
• Haplotype analysis and neutrality testing to assess population genetics and selection pressures.

Main Results:

• Significant genetic diversity was found in the PKLR gene, with 59 SNPs and several loss-of-function variants identified (1.5% frequency).
• Haplotype distribution and allele frequencies showed considerable geographical variation.
• Neutrality testing indicated positive selection of PKLR in sub-Saharan African and Pakistani populations.

Conclusions:

• The human PKLR gene exhibits rich genetic diversity with geographically distinct patterns.
• Evidence of positive selection in PKLR, particularly in populations from malaria-endemic areas, suggests a potential role in evolutionary adaptation to malaria.
• These findings highlight the importance of PKLR genetic variation in the context of Plasmodium falciparum infection and host resistance.