<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>2215-3411</journal-id>
<journal-title><![CDATA[Odovtos International Journal of Dental Sciences]]></journal-title>
<abbrev-journal-title><![CDATA[Odovtos]]></abbrev-journal-title>
<issn>2215-3411</issn>
<publisher>
<publisher-name><![CDATA[Facultad de Odontología. Universidad de Costa Rica]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2215-34112025000200070</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Secondary analysis of public metagenomic data identifies periodontal pathogens in the oral but not gut microbiome]]></article-title>
<article-title xml:lang="es"><![CDATA[Un análisis secundario de datos metagenómicos públicos identifica patógenos periodontales en el microbioma oral, pero no en el intestinal]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Jaramillo-Echeverry]]></surname>
<given-names><![CDATA[Adriana]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rivera-Franco]]></surname>
<given-names><![CDATA[Nelson]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Parra-Patiño]]></surname>
<given-names><![CDATA[Beatriz]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad del Valle  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad del Valle  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad del Valle  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>08</month>
<year>2025</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2025</year>
</pub-date>
<volume>27</volume>
<numero>2</numero>
<fpage>70</fpage>
<lpage>83</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S2215-34112025000200070&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S2215-34112025000200070&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S2215-34112025000200070&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract The oral microbiome, particularly periodontopathogens, may influence the gut microbiome. The aim of this study was to assess the correspondence, diversity, and abundance of periodontopathogenic bacteria in oral and fecal samples from healthy adults. Secondary analyses of 12 public sequences from 6 healthy women, matched by anatomical site (gut and oral cavity), were performed using 16S rRNA- based metagenomics. The sequences were obtained from the BioProject PRJNA834584, published by the Chinese University of Hong Kong, with data generated via Illumina MiSeq. The Shaman application, which relies on Vsearch and DESeq2 for R, along with the Silva database, facilitated the determination of differential abundance and diversity at the species and genus levels between anatomical sites. After dereplication and removal of singletons and chimeras, 352 OTUs were identified. Taxonomic assignment resulted in 148 genera and 80 species, corresponding to 88.64% and 25.85% of annotations, respectively. The dendrogram displayed two distinct clusters separating oral and faecal samples, and principal coordinate analysis accounted for 53.7% of the variance by anatomical site (Permanova test, p=0.003). The Shannon diversity index was 2.14 (95% CI: 1.55-2.73) for fecal samples and 2.28 (2.03-2.53) for oral samples. The Simpson index was 0.70 (0.53-0.88) for faecal samples and 0.82 (0.76- 0.88) for oral samples. Periodontopathogenic bacteria were found exclusively in oral samples, with variations in frequency. No periodontopathogenic species were detected in fecal samples. The human microbiome from two different niches in healthy adults shows distinct bacterial compositions between the oral cavity and the gut, with Bacteroides predominating in faecal samples and Streptococcus in oral samples. Greater richness was observed in faecal samples. Both microbiomes exhibited high bacterial diversity, with no significant differences.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen El microbioma oral, particularmente los periodontopatógenos, puede influir en el microbioma intestinal. El objetivo de este estudio fue evaluar la correspondencia, diversidad y abundancia de bacterias periodontopatógenas en muestras orales y fecales de adultos sanos. Este fue un análisis secundario de 12 secuencias públicas de un estudio previo, provenientes de 6 mujeres sanas, emparejadas por sitio anatómico (intestino y cavidad oral), utilizando metagenómica basada en 16S rRNA. Las secuencias se obtuvieron del BioProject PRJNA834584, publicado por la Universidad China de Hong Kong, y los datos fueron generados mediante Illumina MiSeq. La aplicación Shaman, basada en Vsearch y DESeq2 para R, junto con la base de datos Silva, permitió determinar la abundancia diferencial y diversidad a nivel de especies y géneros entre los sitios anatómicos. Tras la desreplicación y eliminación de singletons y quimeras, se identificaron 352 OTUs. La asignación taxonómica resultó en 148 géneros y 80 especies, correspondientes al 88.64% y 25.85% de las anotaciones, respectivamente. El dendrograma mostró dos grupos distintos que separaban las muestras orales y fecales, y el análisis de coordenadas principales explicó el 53.7% de la varianza por sitio anatómico (prueba Permanova, p=0.003). El índice de diversidad de Shannon fue de 2.14 (IC 95%: 1.55-2.73) en muestras fecales y de 2.28 (2.03-2.53) en muestras orales. El índice de Simpson fue de 0.70 (0.53-0.88) para muestras fecales y de 0.82 (0.76-0.88) para muestras orales. Las bacterias periodontopatógenas se encontraron únicamente en las muestras orales, con variaciones en frecuencia. No se detectaron especies periodontopatógenas en las muestras fecales. El microbioma humano de dos nichos diferentes, en adultos sanos, muestra composiciones bacterianas distintas entre la cavidad oral y el intestino, siendo Bacteroides predominante en muestras fecales y Streptococcus en orales, con mayor riqueza en las muestras fecales. Ambos microbiomas mostraron alta diversidad bacteriana, sin diferencias significativas.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Human microbiome]]></kwd>
<kwd lng="en"><![CDATA[16s ribosomal RNA]]></kwd>
<kwd lng="en"><![CDATA[Metagenomic]]></kwd>
<kwd lng="es"><![CDATA[Microbioma humano]]></kwd>
<kwd lng="es"><![CDATA[ARN ribosómico 16s]]></kwd>
<kwd lng="es"><![CDATA[Metagenómica]]></kwd>
</kwd-group>
</article-meta>
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