Advances in Molecular Biology of Entamoeba histolytica

A special issue of Microorganisms (ISSN 2076-2607). This special issue belongs to the section "Medical Microbiology".

Deadline for manuscript submissions: 30 November 2025 | Viewed by 1041

Special Issue Editor


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Guest Editor
Sección de Estudios de Posgrado e Investigación, ENMH, Instituto Politécnico Nacional, Ciudad de Mexico 07320, Mexico
Interests: characterization of mRNA polyadenylation factors in E. histolytica; development of aptamers that recognize E. histolytica proteins

Special Issue Information

Dear Colleagues,

Entamoeba histolytica, the protozoan parasite responsible for human amoebiasis, affects up to 50 million people worldwide, causing about 26,000 deaths annually. This parasitic infection is endemic in developing countries, and it has also been reported in industrialized countries, mainly in returning travelers from endemic regions, men who have sex with men, and individuals living with HIV. Understanding the molecular basis of the biological activities of this pathogen has been a challenging topic for scientists. Knowledge of the parasite genome, application of recombinant DNA technology, use of omics data, development of new microenvironments in vitro, and bioinformatics approaches, among other methods, are providing new valuable information on various components of parasite molecular biology. This includes descriptions of genome organization, as well as the structure, function, and interactions of DNA, RNA, and proteins. Other aspects involve molecular mechanisms regulating gene expression, cellular processes, metabolic systems, host–pathogen interactions, relationships with the intestinal microbiome, pathogenicity, or drug resistance. This Special Issue aims to present the most recent scientific advances in the E. histolytica molecular biology that could contribute to advancements in the diagnosis and control of this human pathogen.

Dr. Laurence A. Marchat
Guest Editor

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Keywords

  • Entamoeba histolytica
  • genome structure and function
  • protein structure and function
  • pathogenicity and virulence
  • bioinformatics
  • omics
  • relationships with host and microbiome
  • metabolism
  • gene expression
  • drug resistance

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Published Papers (1 paper)

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Research

19 pages, 3913 KB  
Article
The CRISPR-Cas9 System in Entamoeba histolytica Trophozoites: ehcp112 Gene Knockout and Effects on Other Genes in the V1 Virulence Locus
by Luz Virginia Reyes, Guillermina García-Rivera, Rosario Javier-Reyna, Edgar Morales-Rios, Sergio Tinajero, Cecilia Bañuelos, Daniel Talamás-Lara and Esther Orozco
Microorganisms 2025, 13(9), 2219; https://doi.org/10.3390/microorganisms13092219 - 22 Sep 2025
Viewed by 351
Abstract
Gene editing enables a better understanding of protein functions. The genome of the protozoan parasite Entamoeba histolytica contains a 4500 bp DNA fragment comprising the ehcp112, ehadh, and ehrabb genes, which together form the V1 virulence locus. Studying these genes has [...] Read more.
Gene editing enables a better understanding of protein functions. The genome of the protozoan parasite Entamoeba histolytica contains a 4500 bp DNA fragment comprising the ehcp112, ehadh, and ehrabb genes, which together form the V1 virulence locus. Studying these genes has been challenging due to the lack of suitable methodologies. Here, we report the first in vitro and in vivo knockout in E. histolytica (ehcp112 gene) using a modified CRISPR-Cas9 strategy and explore its effects on the other V1 locus genes. Confocal and transmission electron microscopy were used to detect the RNP pathway formed by the Cas9 enzyme and the crRNA–tracrRNA complex, from their entry into the trophozoites until their arrival at the nucleus and heterochromatin. Scanning electron microscopy revealed that the mutant cells (EhCP112-KO) were smaller, with fewer pseudopodia and plasma membrane depressions. DNA sequencing and RT-qPCR assays identified a four-base deletion in the ehcp112 gene in the mutant trophozoites. Western blot assays of EhCP112-KO extracts revealed the absence of the EhCP112 protein. While the EhCP112-KO lysates digested gelatin more efficiently than the HM1:IMSS extracts, their secreted products showed poor enzymatic activity. The ehcp112 knockout also affected the transcription of the ehadh and ehrabb genes, probably due to their genomic position. In conclusion, the implementation of the CRISPR-Cas9 strategy in E. histolytica evidenced the coordinated expression of the ehcp112 gene and the other members of the V1 locus. Full article
(This article belongs to the Special Issue Advances in Molecular Biology of Entamoeba histolytica)
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