ALOX12 in human toxoplasmosis
William H Witola1, Susan Ruosu Liu1, Alexandre Montpetit2
1Department of Ophthalmology and Visual Science, The University of Chicago, Chicago, Illinois, USA.
Infection and Immunity
|April 2, 2014
Summary
The ALOX12 gene influences host responses to Toxoplasma gondii infection. Genetic variants in ALOX12 are linked to congenital toxoplasmosis susceptibility, impacting cellular processes and disease outcomes.
Area of Science:
- Human genetics
- Immunology
- Molecular biology
Background:
- ALOX12 encodes 12-lipoxygenase (12-LOX), involved in producing 12-HETE, which regulates key cellular functions like inflammation.
- ALOX12 variants are associated with diseases such as schizophrenia, atherosclerosis, and cancers.
- Toxoplasma gondii infection triggers significant immune responses and is linked to specific genetic regions affecting host susceptibility.
Purpose of the Study:
- To investigate the role of the human ALOX12 gene in susceptibility to congenital toxoplasmosis.
- To explore the functional impact of ALOX12 on host cellular responses during T. gondii infection.
Main Methods:
- Genotyping analysis to identify ALOX12 susceptibility alleles for congenital toxoplasmosis.
- Genetic engineering of a human monocytic cell line using lentivirus RNA interference to knockdown ALOX12 expression.
- Assessing T. gondii infection progression, parasite burden, and cell death in ALOX12 knockdown cells.
Main Results:
- Identified specific ALOX12 alleles (rs6502997, rs312462, rs6502998, rs434473) associated with increased susceptibility to human congenital toxoplasmosis.
- ALOX12 knockdown led to decreased ALOX12 RNA expression and increased arachidonic acid levels.
- Reduced ALOX12 expression attenuated T. gondii infection progression, increasing parasite burden but decreasing late cell death.
Conclusions:
- The human ALOX12 gene plays a critical role in host response to T. gondii infection.
- ALOX12 genetic variations contribute to susceptibility in human congenital toxoplasmosis.
- Targeting ALOX12 pathways may offer new strategies for managing toxoplasmosis and related inflammatory conditions.
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