[78433] in Daily_Rumour
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daemon@ATHENA.MIT.EDU (Congratulations)
Mon Jul 21 16:41:47 2025
Date: Mon, 21 Jul 2025 22:40:46 +0200
From: "Congratulations" <Congratulations@medicalgarden.click>
Reply-To: "Congratulations" <UltimateOffersProgram@medicalgarden.click>
To: <rumour-mtg@bloom-picayune.mit.edu>
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nes can move freely even between distantly related bacteria, possibly extending to the whole bacterial domain. As a rule of thumb, microbiologists had assumed that members of Bacteria or Archaea with 16S ribosomal RNA gene sequences more similar than 97% to each other need to be checked by DNA–DNA hybridisation to decide if they belong to the same species. This concept was narrowed in 2006 to a similarity of 98.7%.
The 16S sequence is an example of a single locus which is simple enough for non-specialists to apply and, in most cases, sufficient to distinguish species. Using a single easy-to-use locus to distinguish taxa is called DNA barcoding. One of the barcodes for eukaryotes is a region of mitochondrial DNA within the gene for cytochrome c oxidase. A database, Barcode of Life Data System, contains DNA barcode sequences from over 190,000 species. However, scientists such as Rob DeSalle have expressed concern that classical taxonomy and DNA barcoding, which they consider a misnomer, need to be reconciled, as they delimit species differently. Genetic introgression mediated by endosymbionts and other vectors can further make barcodes ineffective in the identification of species.
A singular locus can be a good proxy of time of divergence assuming the chosen locus evolved like most of the rest of the genome. This assumption can be broken by horizontal gene transfer affecting the locus itself. Rapid modes of evolution separating biological species (speciation) over a short timesp
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<div style="color:#FFFFFF;font-size:8px;">nes can move freely even between distantly related bacteria, possibly extending to the whole bacterial domain. As a rule of thumb, microbiologists had assumed that members of Bacteria or Archaea with 16S ribosomal RNA gene sequences more similar than 97% to each other need to be checked by DNA–DNA hybridisation to decide if they belong to the same species. This concept was narrowed in 2006 to a similarity of 98.7%. The 16S sequence is an example of a single locus which is simple enough for non-specialists to apply and, in most cases, sufficient to distinguish species. Using a single easy-to-use locus to distinguish taxa is called DNA barcoding. One of the barcodes for eukaryotes is a region of mitochondrial DNA within the gene for cytochrome c oxidase. A database, Barcode of Life Data System, contains DNA barcode sequences from over 190,000 species. However, scientists such as Rob DeSalle have expressed concern that classical taxonomy and DNA barcoding, which they consider a misnomer, need to be reconciled, as they delimit species differently. Genetic introgression mediated by endosymbionts and other vectors can further make barcodes ineffective in the identification of species. A singular locus can be a good proxy of time of divergence assuming the chosen locus evolved like most of the rest of the genome. This assumption can be broken by horizontal gene transfer affecting the locus itself. Rapid modes of evolution separating biological species (speciation) over a short timesp</div>
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