A Proteogenomic Analysis of Haptoglobin in Malaria

Area of Science:

• Immunogenetics
• Proteomics
• Malariology

Background:

• Haptoglobin (Hp) is an acute phase protein implicated in malaria pathogenesis.
• The Hp gene exhibits two alleles (Hp1, Hp2) resulting in three genotypes (Hp1/Hp1, Hp1/Hp2, Hp2/Hp2).

Purpose of the Study:

• To validate proteomics findings for Hp in malaria using MRM-MS.
• To analyze the association of Hp gene variants with malaria severity and healthy controls.

Main Methods:

• Multiple Reaction Monitoring Mass Spectrometry (MRM-MS) for Hp protein validation.
• Genotyping PCR and DNA sequencing for Hp gene variant analysis.
• Statistical analysis of genotype and haplotype associations with malaria severity.

Main Results:

• Elevated Hp levels correlated significantly with malaria severity, distinct from dengue.
• The Hp2/Hp2 genotype was prevalent in non-severe malaria (74%) and controls (72%) but reduced in severe malaria (31%).
• Hp promoter sequencing identified SNPs and haplotypes associated with non-severe and severe malaria.

Conclusions:

• This proteo-genomic study confirms the association of Haptoglobin with malaria pathogenesis.
• Hp gene variants, particularly the Hp2/Hp2 genotype, may influence malaria severity.