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Mutation detection analysis of a region of 16S-like ribosomal RNA gene of Entamoeba histolytica, Entamoeba dispar and Entamoeba moshkovskii.

Parija SC, Khairnar K - BMC Infect. Dis. (2008)

Bottom Line: We found that 70 stool specimens were positive for E. histolytica, 171 stool specimens were positive for E. dispar, and 37 stool specimens were positive for E. moshkovskii by NM-PCR.The mutations detected by riboprinting and SSCP analysis were confirmed by sequencing.The present study has revealed the subsistence of mutations in the ribosomal RNA genes of E. histolytica and E. moshkovskii, which points towards the existence of intra-species genetic variation in E. histolytica and E. moshkovskii isolates infecting humans.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Microbiology, Jawaharlal Institute of Postgraduate, Medical Education and Research, Puducherry, 605006, India. subhashparija@yahoo.co.in

ABSTRACT

Background: The level of intra-species genetic variation in Entamoeba histolytica, Entamoeba dispar and Entamoeba moshkovskii populations in a localized geographic area, like Puducherry, India, remains unknown.

Methods: In the present study the existence of genetic variation in the nested multiplex polymerase chain reaction (NM-PCR) amplified region of the 16S-like ribosomal RNA genes of E. histolytica, E. dispar and E. moshkovskii was investigated by riboprinting and single strand conformation polymorphism (SSCP) analysis.

Results: We found that 70 stool specimens were positive for E. histolytica, 171 stool specimens were positive for E. dispar, and 37 stool specimens were positive for E. moshkovskii by NM-PCR. Ninety liver abscess pus specimens, 21 urine specimens, and 8 saliva specimens were positive for E. histolytica by NM-PCR. Riboprinting analysis detected a mutation in the PCR product of only one E. histolytica isolate from a stool specimen. However, SSCP analysis detected mutations in the PCR products of five E. histolytica isolates and three E. moshkovskii isolates from stool specimens, and one E. histolytica isolate from a saliva specimen. The mutations detected by riboprinting and SSCP analysis were confirmed by sequencing. All the nucleotide sequences showing mutations in this study have already been deposited into the NCBI GenBank database under accession numbers [GenBank: EF682200 to GenBank: EF682208].

Conclusion: The present study has revealed the subsistence of mutations in the ribosomal RNA genes of E. histolytica and E. moshkovskii, which points towards the existence of intra-species genetic variation in E. histolytica and E. moshkovskii isolates infecting humans.

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Multiple sequence alignment of the E. moshkovskii specific 553 bp PCR products from stool specimens (Stool-6 to 8) and the standard strain E. moshkovskii Laredo (EM-Std). The sequence variations are highlighted in red.
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Figure 6: Multiple sequence alignment of the E. moshkovskii specific 553 bp PCR products from stool specimens (Stool-6 to 8) and the standard strain E. moshkovskii Laredo (EM-Std). The sequence variations are highlighted in red.

Mentions: All three E. moshkovskii PCR products showing mutation by SSCP analysis (Stool- 6, 7, and 8) were confirmed by nucleotide sequencing. The multiple sequence alignment of these sequences and the standard strain E. moshkovskii Laredo is depicted in figure 6. The comparative electropherogram showing the mutant (Stool- 6, 7, and 8) and normal control (E. moshkovskii Laredo) 16S-like rRNA genes is shown in figure 7.


Mutation detection analysis of a region of 16S-like ribosomal RNA gene of Entamoeba histolytica, Entamoeba dispar and Entamoeba moshkovskii.

Parija SC, Khairnar K - BMC Infect. Dis. (2008)

Multiple sequence alignment of the E. moshkovskii specific 553 bp PCR products from stool specimens (Stool-6 to 8) and the standard strain E. moshkovskii Laredo (EM-Std). The sequence variations are highlighted in red.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC2570676&req=5

Figure 6: Multiple sequence alignment of the E. moshkovskii specific 553 bp PCR products from stool specimens (Stool-6 to 8) and the standard strain E. moshkovskii Laredo (EM-Std). The sequence variations are highlighted in red.
Mentions: All three E. moshkovskii PCR products showing mutation by SSCP analysis (Stool- 6, 7, and 8) were confirmed by nucleotide sequencing. The multiple sequence alignment of these sequences and the standard strain E. moshkovskii Laredo is depicted in figure 6. The comparative electropherogram showing the mutant (Stool- 6, 7, and 8) and normal control (E. moshkovskii Laredo) 16S-like rRNA genes is shown in figure 7.

Bottom Line: We found that 70 stool specimens were positive for E. histolytica, 171 stool specimens were positive for E. dispar, and 37 stool specimens were positive for E. moshkovskii by NM-PCR.The mutations detected by riboprinting and SSCP analysis were confirmed by sequencing.The present study has revealed the subsistence of mutations in the ribosomal RNA genes of E. histolytica and E. moshkovskii, which points towards the existence of intra-species genetic variation in E. histolytica and E. moshkovskii isolates infecting humans.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Microbiology, Jawaharlal Institute of Postgraduate, Medical Education and Research, Puducherry, 605006, India. subhashparija@yahoo.co.in

ABSTRACT

Background: The level of intra-species genetic variation in Entamoeba histolytica, Entamoeba dispar and Entamoeba moshkovskii populations in a localized geographic area, like Puducherry, India, remains unknown.

Methods: In the present study the existence of genetic variation in the nested multiplex polymerase chain reaction (NM-PCR) amplified region of the 16S-like ribosomal RNA genes of E. histolytica, E. dispar and E. moshkovskii was investigated by riboprinting and single strand conformation polymorphism (SSCP) analysis.

Results: We found that 70 stool specimens were positive for E. histolytica, 171 stool specimens were positive for E. dispar, and 37 stool specimens were positive for E. moshkovskii by NM-PCR. Ninety liver abscess pus specimens, 21 urine specimens, and 8 saliva specimens were positive for E. histolytica by NM-PCR. Riboprinting analysis detected a mutation in the PCR product of only one E. histolytica isolate from a stool specimen. However, SSCP analysis detected mutations in the PCR products of five E. histolytica isolates and three E. moshkovskii isolates from stool specimens, and one E. histolytica isolate from a saliva specimen. The mutations detected by riboprinting and SSCP analysis were confirmed by sequencing. All the nucleotide sequences showing mutations in this study have already been deposited into the NCBI GenBank database under accession numbers [GenBank: EF682200 to GenBank: EF682208].

Conclusion: The present study has revealed the subsistence of mutations in the ribosomal RNA genes of E. histolytica and E. moshkovskii, which points towards the existence of intra-species genetic variation in E. histolytica and E. moshkovskii isolates infecting humans.

Show MeSH
Related in: MedlinePlus