16S rRNA, 23S rRNA and RAPD Fingerprinting Analysis of Helicobacter Genomic DNA
Next, we investigated the 16S rRNA of these isolates in direct comparison with various Helicobacter species including H. pylori, H. acinonychis, H. felis, H. fennelliae, H. hepaticus, H. mustelae, H. salomonis, H. bilis, H. cinaedi, H. typhlonius, H. magdeburgensis, H. bizzozeroni, H. canis and H. aurati. For this purpose, we amplified a 1.2 kb DNA fragment of the 16S rRNA region which is highly conserved within the genus Helicobacter [53]. All Helicobacter species revealed the expected PCR product, while Campylobacter jejuni or other controls did not (Fig. 2A and data not shown). To confirm the specificity of these fragments, all PCR products were then digested with the restriction endonuclease HhaI or AluI, which yield specific band patterns for known Helicobacter species [54]. The RFLP pattern was similar between various Helicobacter isolates (Fig. 2B and Fig. S2A–B), and SB-1 was most similar to those of H. pylori and H. acinonychis, which suggests that our Bengal tiger isolates are closely related to these species. This conclusion is in good agreement with the RAPD fingerprinting profiles using various primers (Fig. 2C and Fig. S2C–D). The 16S rRNA genes from our individual isolates were then sequenced (GenBank accession number JN251811.1). They belong phylogenetically to a specific 16S rRNA gene cluster, which includes isolates of the species H. acinonychis and H. pylori (Fig. 3A). Sequencing of a 23S rRNA gene fragment yielded a dendrogram which was also in full agreement with that generated by the analysis of the 16S rRNA gene (Fig. S3).
16S rRNA, 23S rRNA และ RAPD วิเคราะห์ลายพิมพ์ดีเอ็นเอออก HelicobacterNext, we investigated the 16S rRNA of these isolates in direct comparison with various Helicobacter species including H. pylori, H. acinonychis, H. felis, H. fennelliae, H. hepaticus, H. mustelae, H. salomonis, H. bilis, H. cinaedi, H. typhlonius, H. magdeburgensis, H. bizzozeroni, H. canis and H. aurati. For this purpose, we amplified a 1.2 kb DNA fragment of the 16S rRNA region which is highly conserved within the genus Helicobacter [53]. All Helicobacter species revealed the expected PCR product, while Campylobacter jejuni or other controls did not (Fig. 2A and data not shown). To confirm the specificity of these fragments, all PCR products were then digested with the restriction endonuclease HhaI or AluI, which yield specific band patterns for known Helicobacter species [54]. The RFLP pattern was similar between various Helicobacter isolates (Fig. 2B and Fig. S2A–B), and SB-1 was most similar to those of H. pylori and H. acinonychis, which suggests that our Bengal tiger isolates are closely related to these species. This conclusion is in good agreement with the RAPD fingerprinting profiles using various primers (Fig. 2C and Fig. S2C–D). The 16S rRNA genes from our individual isolates were then sequenced (GenBank accession number JN251811.1). They belong phylogenetically to a specific 16S rRNA gene cluster, which includes isolates of the species H. acinonychis and H. pylori (Fig. 3A). Sequencing of a 23S rRNA gene fragment yielded a dendrogram which was also in full agreement with that generated by the analysis of the 16S rRNA gene (Fig. S3).
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