Gene/Protein Disease Symptom Drug Enzyme Compound
Pivot Concepts:   Target Concepts:
Query: EC:2.4.2.8 (hypoxanthine-guanine phosphoribosyltransferase)
 2,527 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Gene targeting in embryonic stem (ES) cells is a powerful tool for generating mice with null alleles. Current methods of gene inactivation in ES cells introduce a neomycin gene (neo) cassette both as a mutagen and a selection marker for transfected cells. Although null alleles are valuable, changes at the nucleotide level of a gene are very important for functional analysis. One gene family in which subtle mutations would be particularly valuable are the clusters of Hox homeobox genes. Inactivation of gene in a cluster with a neo cassette that includes promoter/enhancer elements may deregulate transcription of neighbouring genes and generate a phenotype which is difficult to interpret. We describe here a highly efficient gene targeting method, termed the 'hit and run' procedure. This generates ES cells with subtle site-specific mutations with no selectable marker and may be useful for most genes. We have developed this procedure at the hypoxanthine phosphoribosyltransferase (hprt) locus and subsequently isolated ES cells with a premature stop codon in the homeobox of Hox-2.6 (ref. 14).
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PMID:Introduction of a subtle mutation into the Hox-2.6 locus in embryonic stem cells. 167 46