最短
1. ES microinjection, transfer to foster, chimera born ~3wk
2. wait until chimera reaches the breeding age, 8wk
3. Cross to Flp or Cre tg to obtain germline transmission (heterozygous F1) and deletion of selection cassette, ~3wks
4. wait until F1 mice reach the breeding age, 8wk
5. intercross heterozygous F1 and obtain homozygous, 3wk
6. Wait until homozygous mice get old enough for experiments, 1-3 months (assumption: Cre or Flp tg has no influence on the phenotype).
Sangerは知りませんが、今時のKOMPやEucommのESはB6N-derivedなので バックグラウンド云々は大きな問題にならないでしょう. |
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