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Dating back to the 1940s and continuing today, T-even phages are considered the best studied model organisms. Model organisms are usually required to be simple with as few as five genes. Yet, T-even phages are in fact among the largest and highest complexity virus, in which these phage's genetic information is made up of around 300 genes.
The first phages that were studied in detail included seven that commonly infect E. coli. They were named Type 1 (T1), Type 2 (T2), etc., for easy reference; however, due to structural similarities between the T2, T4, and T6 bacteriophages, these are now commonly referred to as T-Even phages .
In a 1945 study by Demerec and Fano, [4] T7 was used to describe one of the seven phage types (T1 to T7) that grow lytically on Escherichia coli. [5] Although all seven phages were numbered arbitrarily, phages with odd numbers, or T-odd phages, were later discovered to share morphological and biochemical features that distinguish them from T-even phages. [6]
Structural model at atomic resolution of bacteriophage T4 [1] The structure of a typical myovirus bacteriophage Anatomy and infection cycle of bacteriophage T4.. A bacteriophage (/ b æ k ˈ t ɪər i oʊ f eɪ dʒ /), also known informally as a phage (/ ˈ f eɪ dʒ /), is a virus that infects and replicates within bacteria and archaea.
Download as PDF; Printable version; ... They include the T-even and the T-odd phages. Pages in category "T-phages"
The ICTV's first report (1971) included the genus T-even phages, unassigned to an order, family, or subfamily. [4] The genus was renamed in 1976 to T-even phage group, moved into the newly created family Myoviridae in 1981. In 1993, it was renamed again to T4-like phages, and was moved into the newly created order Caudovirales in 1998.
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Superinfection exclusion, or protection against infection by multiple phages, can be conferred by prophage integration. [12] Additionally, phage-mediated recombination mechanisms may remodel the host chromosome and provide new ways for cells to regulate metabolism and gene expression, such as those involved in sporulation and competence.