Abstract:
:We have produced three lines of transgenic mice that contain additional copies of the mouse phosphoglycerate kinase 1 (Pgk1) gene. Two of these lines, 94-A and 94-K, which are descendants of a common founder, did not produce liveborn progeny carrying two copies of these transgenes (i.e., A/A, K/K, or A/K). Genotyping of midgestation embryos showed that A/K embryos are dead by Embryonic Day 10. Comparison of the level of transgene expression in the three transgenic lines ruled out PGK1 toxicity as the cause of death of A/A, A/K, and K/K embryos. The death of A/A, K/K, and A/K transgenic mice was therefore attributed to an insertional mutation disrupting a gene or genes essential for normal embryogenesis. Analysis of the structure of the 94-A and 94-K transgenes indicated that they differ in the number of tandem repeats and in the positions of the transgene-cellular DNA junctions. To determine if the two transgenes represent a single integration followed by a rearrangement or two independent integration events, we cloned the endogenous sequences surrounding the 94-A and 94-K transgene insertion sites. Restriction analysis of the isolated genomic clones indicated that the endogenous sequences abutting the 3' ends of the 94-A and 94-K transgenes are separated by less than 20 kb, providing strong support for the single integration model. Further analysis indicated that the 94-A transgene is associated with a deletion of at least 18 kb and is located in the vicinity of a widely transcribed endogenous gene. Chromosomal mapping of the endogenous sequences flanking the 94-A and 94-K transgene insertions using mouse-hamster somatic cell hybrids and a (C57BL/6J x SPRET/Ei)F1 x SPRET/Ei backcross panel allowed us to assign the 94-A(K) transgene insertion to the subcentral region of mouse chromosome 8.
journal_name
Genomicsjournal_title
Genomicsauthors
Pravtcheva DD,Wise TLdoi
10.1006/geno.1995.1274subject
Has Abstractpub_date
1995-12-10 00:00:00pages
529-44issue
3eissn
0888-7543issn
1089-8646pii
S0888-7543(85)71274-8journal_volume
30pub_type
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