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Updated: May 9, 2026
Using SCOPE to Identify Potential Regulatory Motifs in Coregulated Genes
Published on: May 31, 2011
Genome-wide upstream motif analysis of Cryptosporidium parvum genes clustered by expression profile
Jenna Oberstaller1, Sandeep J Joseph, Jessica C Kissinger
1Center for Tropical and Emerging Global Diseases, University of Georgia, Athens, GA 30602, USA.
Background:
There are very few molecular genetic tools available to study the apicomplexan parasite Cryptosporidium parvum. The organism is not amenable to continuous in vitro cultivation or transfection, and purification of intracellular developmental stages in sufficient numbers for most downstream molecular applications is difficult and expensive since animal hosts are required. As such, very little is known about gene regulation in C. parvum.
Results:
We have clustered whole-genome gene expression profiles generated from a previous study of seven post-infection time points of 3,281 genes to identify genes that show similar expression patterns throughout the first 72 hours of in vitro epithelial cell culture. We used the algorithms MEME, AlignACE and FIRE to identify conserved, overrepresented DNA motifs in the upstream promoter region of genes with similar expression profiles. The most overrepresented motifs were E2F (5'-TGGCGCCA-3'); G-box (5'-G.GGGG-3'); a well-documented ApiAP2 binding motif (5'-TGCAT-3'), and an unknown motif (5'-[A/C] AACTA-3'). We generated a recombinant C. parvum DNA-binding protein domain from a putative ApiAP2 transcription factor [CryptoDB: cgd8_810] and determined its binding specificity using protein-binding microarrays. We demonstrate that cgd8_810 can putatively bind the overrepresented G-box motif, implicating this ApiAP2 in the regulation of many gene clusters.
Conclusion:
Several DNA motifs were identified in the upstream sequences of gene clusters that might serve as potential cis-regulatory elements. These motifs, in concert with protein DNA binding site data, establish for the first time the beginnings of a global C. parvum gene regulatory map that will contribute to our understanding of the development of this zoonotic parasite.
Insights
Researchers identified novel DNA motifs regulating gene expression in Cryptosporidium parvum, a significant step towards understanding this parasite. This work lays the foundation for a global gene regulatory map for Cryptosporidium parvum.
Area of Science:
- Molecular genetics
- Parasitology
- Genomics
Background:
- Limited molecular genetic tools hinder Cryptosporidium parvum research.
- Challenges in cultivation and purification impede study of gene regulation.
- Understanding gene regulation is crucial for this zoonotic parasite.
Purpose of the Study:
- Identify DNA motifs involved in Cryptosporidium parvum gene regulation.
- Develop a foundational gene regulatory map for the parasite.
- Advance the study of apicomplexan parasite development.
Main Methods:
- Clustered whole-genome gene expression profiles from seven time points.
- Utilized MEME, AlignACE, and FIRE algorithms to find DNA motifs.
- Determined transcription factor binding specificity using protein-binding microarrays.
Main Results:
- Identified overrepresented DNA motifs including E2F, G-box, and an ApiAP2 binding motif.
- A putative ApiAP2 transcription factor (cgd8_810) was shown to bind the G-box motif.
- Established potential cis-regulatory elements for gene clusters.
Conclusions:
- Discovered potential cis-regulatory elements in upstream gene sequences.
- Initiated a global Cryptosporidium parvum gene regulatory map.
- Provided insights into the development of this zoonotic parasite.
