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Alternative site-specific recombination systems
There are now recombinases and target sites available in addition to FLP and FRT for use in Drosophila. The following stocks contain constructs expressing recombinases and constructs for testing recombinase activity.

Most of these constructs were described in Nern et al. (2011), which discusses the merits of each system. It also discusses the toxic effects on flies of expressing cre recombinase, which, though better known than these other recombinases, presents many disadvantages.

Go to the main FLP/FRT and other recombinases page.
Component Stk # Promoter Chr Genotype
   B2 recombinase and B2 target sites
B2 recombinase 55780 20XUAS 3 w[1118]; P{y[+t7.7] w[+mC]=20XUAS-B2R.PEST}attP2
B2 recombinase 55781 3XUAS 2 w[1118]; P{y[+t7.7] w[+mC]=3XUAS-B2R.PEST}attP40
B2 recombinase 55782 UAS 3 w[1118]; P{y[+t7.7] w[+mC]=UAS-B2R.PEST}attP2/TM3, Sb[1]
B2 target 55783 UAS 2 w[1118]; P{y[+t7.7] w[+mC]=20xUAS(B2RT.stop)RFP.Myr}attP40
B2 target 55784 UAS 3 w[1118]; PBac{y[+mDint2] w[+mC]=20xUAS(B2RT.stop)RFP.Myr}VK00005
   B3 recombinase and B3 target sites
B3 recombinase 55785 20XUAS 3 w[1118]; P{y[+t7.7] w[+mC]=20XUAS-B3R.PEST}attP2
B3 recombinase 55786 3XUAS 2 w[1118]; P{y[+t7.7] w[+mC]=3XUAS-B3R.PEST}attP40/CyO
B3 recombinase 55787 UAS 3 w[1118]; P{y[+t7.7] w[+mC]=UAS-B3R.PEST}attP2
B3 target 55788 UAS 2 w[1118]; P{y[+t7.7] w[+mC]=20xUAS(B3RT.stop)RFP.Myr}attP40
B3 target 55789 UAS 3 w[1118]; PBac{y[+mDint2] w[+mC]=20xUAS(B3RT.stop)RFP.Myr}VK00005
   Bxb1 recombinase
Bxb1 recombinase 67102 vas 2 y[1] w[*]; M{y[+mDint]=vas-Bxb1.nos3'UTR}ZH-22A
Bxb1 recombinase 67105 vas 2 y[1] w[*]; M{y[+mDint]=vas-Bxb1.nos3'UTR.RFP-}ZH-22A
Bxb1 recombinase 67103 vas 3 y[1] w[*]; M{y[+mDint]=vas-Bxb1.nos3'UTR}ZH-86Fa/MKRS
Bxb1 recombinase 67106 vas 3 y[1] w[*]; M{y[+mDint]=vas-Bxb1.nos3'UTR.RFP-}ZH-86Fa/TM2
Bxb1 recombinase 67101 vas X y[1] M{y[+mDint]=vas-Bxb1.nos3'UTR}ZH-2A w[*]
Bxb1 recombinase 67104 vas X y[1] M{y[+mDint]=vas-Bxb1.nos3'UTR.RFP-}ZH-2A w[*]
   cre recombinase and loxP target sites
cre recombinase 1092 2 y[1] w[67c23]; sna[Sco]/CyO, P{w[+mC]=Crew}DH1
cre recombinase 1501 3 y[1] w[67c23]; MKRS, P{ry[+t7.2]=hsFLP}86E/TM6B, P{w[+mC]=Crew}DH2, Tb[1]
cre recombinase 766 X y[1] w[67c23] P{y[+mDint2]=Crey}1b; sna[Sco]/CyO
cre recombinase 851 X y[1] w[67c23] P{y[+mDint2]=Crey}1b; D[*]/TM3, Sb[1]
cre recombinase 34516 X y[1] w[67c23] P{y[+mDint2]=Crey}1b; sna[Sco]/CyO; Dr[1]/TM3, Sb[1]
cre recombinase 60299 X y[1] M{vas-int.Dm}ZH-2A w[*], P{y[+mDint2]=Crey}1b
cre recombinase 56164 dpn 1 w[*] P{y[+t7.7] w[+mC]=dpn(KDRT.stop)cre.PEST}su(Hw)attP8
cre recombinase 67094 dpn 1 w[*] P{y[+t7.7] w[+mC]=dpn(KDRT.stop)cre.PEST}su(Hw)attP8; P{y[+t7.7] w[+mC]=Act(loxP.GAL80.stop)lexA::p65}attP40, P{y[+t7.7] w[+mC]=lexAop-rCD2::RFP-p10.UAS-mCD8::GFP-p10}su(Hw)attP5
cre recombinase 67095 dpn 1 w[*] P{y[+t7.7] w[+mC]=hs(KDRT.stop)FLP}attP18, P{y[+t7.7] w[+mC]=dpn(FRT.stop)cre.PEST}su(Hw)attP8; P{y[+t7.7] w[+mC]=Act(loxP.GAL80.stop)lexA::p65}attP40, P{y[+t7.7] w[+mC]=lexAop-rCD2::RFP-p10.UAS-mCD8::GFP-p10}su(Hw)attP5; TM3, Sb[1]/TM6B, Tb[1]
cre recombinase 55800 UAS 2 w[1118]; P{y[+t7.7] w[+mC]=3XUAS-cre.PEST}attP40
cre recombinase 55801 UAS 3 w[1118]; P{y[+t7.7] w[+mC]=UAS-cre.PEST}attP2
loxP 55803 UAS 2 w[1118]; P{y[+t7.7] w[+mC]=10XUAS(loxP.stop)GFP.Myr}attP40
loxP 55803 UAS 2 w[1118]; P{y[+t7.7] w[+mC]=10XUAS(loxP.stop)GFP.Myr}attP40
loxP 55802 UAS 3 w[1118]; P{y[+t7.7] w[+mC]=10XUAS(loxP.stop)GFP.Myr}attP2
loxP 55802 UAS 3 w[1118]; P{y[+t7.7] w[+mC]=10XUAS(loxP.stop)GFP.Myr}attP2
   FLPm5 recombinase - This FLP variant was selected to interact with a variant FRT sequence. This FLP–FRT system is mutually incompatible with regular FLP–FRT.
FLPm5 35533 Hsp 2 w[*]; P{w[+mC]=hs-FLPm5}2/In(2LR)Gla, wg[Gla-1] PPO1[Bc]; TM2/TM6B, Tb[1]
FLPm5 56799 Hsp 2 w[*]; P{w[+mC]=hs-FLPm5}MH12; TM6B, Tb[1]/TM2
FLPm5 35534 Hsp 3 w[*]; CyO/In(2LR)Gla, wg[Gla-1] PPO1[Bc]; P{w[+mC]=hs-FLPm5}3
   KD recombinase and KD target sites
KD recombinase 55790 20XUAS 3 w[1118]; P{y[+t7.7] w[+mC]=20XUAS-KDR.PEST}attP2
KD recombinase 55791 3XUAS 2 w[1118]; P{y[+t7.7] w[+mC]=3XUAS-KDR.PEST}attP40
KD recombinase 56167 Hsp X w[*] P{y[+t7.7] w[+mC]=hs-KD}attP3
KD recombinase 56168 hth X w[*] P{y[+t7.7] w[+mC]=GMR44F03-KD}su(Hw)attP8
KD recombinase 67089 stg (putative) 3 w[*]; P{y[+t7.7] w[+mC]=stg14-KD}attP2
KD recombinase 55792 UAS 3 w[1118]; P{y[+t7.7] w[+mC]=UAS-KDR.PEST}attP2
KD target 56509 3 w[*]; Pin[1]/CyO; P{KDRT.A}82F7 P{w[+mC]=tubP-GAL80}LL3/TM3, Sb[1]
KD target 56508 eyeless (mouse Pax6) 3 w[*]; Pin[1]/CyO; P{3xP3-RFP.KDRT}82F7
KD target 55793 UAS 2 w[1118]; P{y[+t7.7] w[+mC]=20xUAS(KDRT.stop)RFP.Myr}attP40
KD target 55794 UAS 3 w[1118]; PBac{y[+mDint2] w[+mC]=20xUAS(KDRT.stop)RFP.Myr}VK00005
   R recombinase (RSR) and RSRT target sites
R recombinase 55756 20XUAS 3 w[*]; Bl[1]/CyO, P{w[+mC]=GAL4-Kr.C}DC3, P{w[+mC]=UAS-GFP.S65T}DC7; PBac{y[+mDint2] w[+mC]=brp(RSRT.Stop)V5-2A-LexA-VP16}VK00033 P{y[+t7.7] w[+mC]=20XUAS-RSR.PEST}attP2/TM6B, Tb[1]
R recombinase 55764 20XUAS 3 w[*]; P{y[+t7.7] w[+mC]=ort(FRT.SA.Stop)OLLAS}attP40; PBac{y[+mDint2] w[+mC]=brp(RSRT.Stop)V5-2A-LexA-VP16}VK00033 P{w[+mC]=20XUAS-RSR.PEST}attP2
R recombinase 55795 20XUAS 3 w[1118]; P{y[+t7.7] w[+mC]=20XUAS-RSR.PEST}attP2
R recombinase 55796 3XUAS 2 w[1118]; P{y[+t7.7] w[+mC]=3XUAS-RSR.PEST}attP40
R recombinase 55767 Rh4 2 w[*]; P{y[+t7.7] w[+mC]=Rh4-RSR.PEST}su(Hw)attP5/CyO; TM2/TM6B, Tb[1]
R recombinase 55797 UAS 3 w[1118]; P{y[+t7.7] w[+mC]=UAS-RSR.PEST}attP2
R target 55798 UAS 2 w[1118]; P{y[+t7.7] w[+mC]=20xUAS(RSRT.stop)RFP.Myr}attP40/CyO
R target 55799 UAS 3 w[1118]; PBac{y[+mDint2] w[+mC]=20xUAS(RSRT.stop)RFP.Myr}VK00005