Single-cell transcriptomics reveals inter-ethnic variation in immune response to Falciparum malaria

Area of Science:

• Immunology
• Genetics
• Infectious Diseases

Background:

• African populations exhibit diverse responses to malaria (Plasmodium falciparum).
• The Fulani ethnic group shows lower malaria susceptibility compared to other groups like the Mossi.
• Mechanisms underlying Fulani malaria resistance are not fully understood at the cellular level.

Purpose of the Study:

• To investigate the molecular and cellular basis of malaria resistance in Fulani children.
• To compare immune responses between Fulani and Mossi children using single-cell transcriptomics.
• To identify ethnic-specific immune signatures and genetic regulatory effects.

Main Methods:

• Single-cell RNA sequencing of peripheral blood mononuclear cells from 126 Fulani and Mossi children.
• Analysis of over 70,000 single-cell transcriptomes to identify cell subtypes.
• Differential gene expression and single-cell expression quantitative trait locus (eQTL) analysis.

Main Results:

• Ethnicity significantly impacts the transcriptional landscape, especially in monocytes.
• Fulani monocytes and T cells show reduced pro-inflammatory responses.
• Fulani B cells exhibit stronger activation and inflammatory profiles.
• Identified ethnicity-specific regulatory variants affecting immune genes (e.g., CD36, MT2A) in monocytes.

Conclusions:

• Host immune responses to malaria are shaped by ethnicity, cell type, and genetic regulation.
• Single-cell transcriptomics and eQTL analysis reveal key differences in malaria-resistant populations.
• Provides valuable datasets for understanding malaria and host-pathogen interactions in under-represented groups.