Related Experiment Video
Updated: Jun 16, 2026
Author Spotlight: Identifying Compensatory Pathways in Malaria Parasites Containing Hypomorphic Allele of Essential Protein Kinases
Published on: November 22, 2024
Entire expressed peripheral blood transcriptome in pediatric severe malarial anemia
Samuel B Anyona1,2, Qiuying Cheng3, Sharley A Wasena4,5
1Department of Medical Biochemistry, School of Medicine, Maseno University, Maseno, 40105, Kenya. sanyona@maseno.ac.ke.
Insights
Severe malarial anemia (SMA) in children involves impaired immune responses and cellular regulation. Transcriptome analysis reveals disrupted pathways, offering potential therapeutic targets for this life-threatening condition.
Area of Science:
- Immunology
- Genomics
- Pediatric Infectious Diseases
Background:
- Severe malarial anemia (SMA) is a major cause of childhood illness and death globally.
- Understanding the molecular mechanisms of SMA is crucial for developing effective treatments.
Purpose of the Study:
- To compare the whole blood host transcriptome of children with and without SMA.
- To identify molecular pathways and cellular responses involved in SMA pathogenesis.
Main Methods:
- Whole blood transcriptome analysis (RNA-Seq) in Kenyan children (3-48 months) with and without SMA.
- Differential gene expression analysis, immune cell profiling, and pathway enrichment analyses.
- Validation using targeted RNA-Seq in a Ugandan SMA cohort.
Main Results:
- SMA is associated with 1403 up-regulated and 279 down-regulated transcripts.
- Key findings include impaired inflammasome activation, cell death, innate immunity, and memory responses.
- Disruptions in cellular homeostasis, ubiquitin-proteasome system, autophagy, heme metabolism, and hypoxia-inducible factor (HIF)-1/ROS signaling were observed.
Conclusions:
- SMA involves complex molecular disruptions, including immature/improperly regulated immune responses and altered cellular homeostasis.
- Hypoxia-related signaling pathways are central to SMA pathogenesis.
- These findings highlight potential novel therapeutic targets for SMA.
Abstract:
This study on severe malarial anemia (SMA: Hb < 6.0 g/dL), a leading global cause of childhood morbidity and mortality, compares the entire expressed whole blood host transcriptome between Kenyan children (3-48 mos.) with non-SMA (Hb ≥ 6.0 g/dL, n = 39) and SMA (n = 18). Differential expression analyses reveal 1403 up-regulated and 279 down-regulated transcripts in SMA, signifying impairments in host inflammasome activation, cell death, and innate immune and cellular stress responses. Immune cell profiling shows decreased memory responses, antigen presentation, and immediate pathogen clearance, suggesting an immature/improperly regulated immune response in SMA. Module repertoire analysis of blood-specific gene signatures identifies up-regulation of erythroid genes, enhanced neutrophil activation, and impaired inflammatory responses in SMA. Enrichment analyses converge on disruptions in cellular homeostasis and regulatory pathways for the ubiquitin-proteasome system, autophagy, and heme metabolism. Pathway analyses highlight activation in response to hypoxic conditions [Hypoxia Inducible Factor (HIF)-1 target and Reactive Oxygen Species (ROS) signaling] as a central theme in SMA. These signaling pathways are also top-ranking in protein abundance measures and a Ugandan SMA cohort with available transcriptomic data. Targeted RNA-Seq validation shows strong concordance with our entire expressed transcriptome data. These findings identify key molecular themes in SMA pathogenesis, offering potential targets for new malaria therapies.
More Related Videos
09:08Isolating Human Peripheral Blood Mononuclear Cells and CD4+ T cells from Sézary Syndrome Patients for Transcriptomic Profiling
Published on: October 14, 2021
10:22Methods to Investigate the Regulatory Role of Small RNAs and Ribosomal Occupancy of Plasmodium falciparum
Published on: December 4, 2015
