Genetic Methods and Construction of Chromosomal Mutations in Methanogenic Archaea.
Methods Mol Biol 2022;
2522:105-117. [PMID:
36125745 DOI:
10.1007/978-1-0716-2445-6_6]
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Abstract
Genetic manipulation through markerless exchange enables the modification of several genomic regions without leaving a selection marker in the genome. Here, a method using hpt coding for hypoxanthine phosphoribosyltransferase as a counter selectable marker is described. For Methanosarcina species a chromosomal deletion of the hpt gene is firstly generated, which confers resistance to the purine analogue 8-aza-2,6-diaminopurine (8-ADP). In a second step, the reintroduction of the hpt gene on a plasmid leads to a selectable loss of 8-ADP resistance after a homologous recombination event (pop-in). A subsequent pop-out event restores the 8-ADP resistance and can generate chromosomal mutants with frequencies of about 50%.
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