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Updated: Jun 29, 2026
A Genetic Screen to Isolate Toxoplasma gondii Host-cell Egress Mutants
Published on: February 8, 2012
Identification of subtelomeric cluster-genes associated to sexual stage in Toxoplasma gondii
Laura Vanagas1, Andres M Alonso1, Sergio O Angel1
1Laboratorio de Parasitología Molecular, Instituto Tecnológico de Chascomús (CONICET-UNSAM), Chascomús, Provincia de Buenos Aires, Argentina; Escuela de Bio y Nanotecnologías (UNSAM), Argentina.
Abstract:
Toxoplasma gondii is an obligate intracellular parasite with sexual reproduction in the intestinal epithelium of felines. The depletion of two gene repressors, AP2XI-2 and AP2XII-1, induces merozoite formation and gene expression towards sexual commitment. Based on RNA-seq datasets of AP2XI-2 and AP2XII-1 knock downs we identified subtelomeric (ST) TgB12 and hypothetical (HP) genes upregulated. Some of the differentially expressed genes (DEGs) are arranged in ST clusters. These DEG products are characterized by high isoelectric points (pI) and may encode small proteins. The potential roles of these clusters of DEG ST genes in environmental resistance or parasite sexual development of T. gondii is discussed.
Insights
Depleting gene repressors in Toxoplasma gondii promotes sexual development. This study identifies subtelomeric genes upregulated during this process, potentially aiding parasite survival and reproduction.
Area of Science:
- Parasitology
- Molecular Biology
- Genetics
Background:
- Toxoplasma gondii, an obligate intracellular parasite, undergoes sexual reproduction in felines.
- Gene repressors AP2XI-2 and AP2XII-1 control parasite development and sexual commitment.
Purpose of the Study:
- To investigate gene expression changes associated with sexual commitment in T. gondii.
- To identify specific genes and gene clusters involved in sexual development.
Main Methods:
- RNA-sequencing (RNA-seq) analysis of gene knockdowns (AP2XI-2 and AP2XII-1).
- Identification and characterization of differentially expressed genes (DEGs).
Main Results:
- Depletion of AP2XI-2 and AP2XII-1 induced merozoite formation and sexual gene expression.
- Subtelomeric (ST) and hypothetical (HP) genes, including TgB12, were found to be upregulated.
- Some upregulated DEGs are organized in ST clusters and encode small proteins with high isoelectric points (pI).
Conclusions:
- The identified ST gene clusters may play roles in environmental resistance or sexual development of T. gondii.
- Understanding these genes provides insights into the regulation of parasite sexual reproduction.
