Qhov sib txawv tseem ceeb ntawm cov khoom sib xyaw thiab cov tsis sib xyaw ua ke yog cov khoom sib xyaw ua ke muaj ob qhov sib txuas sib txuas sib txuas thaum tsis sib xyaw cov transposons tau rov ua dua rov ua dua es tsis txhob cuam tshuam cov lus sib dhos.
Ib transposon yog ib feem ntawm DNA uas tuaj yeem hloov mus rau hauv cov kab mob genome. Lawv yog mobile DNA sequences. Lawv tsiv mus rau qhov chaw tshiab ntawm genome. Cov kev txav no ua rau muaj kev hloov pauv ntawm cov kab mob genome, ua rau muaj kev hloov pauv tseem ceeb hauv cov ntaub ntawv caj ces. Lawv yog cov transposable genetic ntsiab lub luag hauj lwm rau tsim cov tshiab genetic sequences nyob rau hauv cov kab mob. Transposons kuj tseem hu ua jumping genes vim tias cov kev dhia dhia no tuaj yeem thaiv qhov kev hloov pauv ntawm cov noob thiab rov kho cov khoom siv caj ces ntawm cov kab mob. Tsis tas li ntawd, lawv muaj lub luag haujlwm rau kev txav ntawm cov tshuaj tiv thaiv, tshuaj tua kab mob ntawm cov plasmids thiab chromosomes. Muaj ob hom transposons li composite thiab non-composite transposons.
Composite Transposons yog dab tsi?
Ib qho sib xyaw ua ke yog ib ntu ntawm DNA flanked los ntawm ob daim ntawv theej ntawm cov khoom sib txuas zoo sib xws. Muaj ib cheeb tsam ntawm cov protein-coding nyob rau hauv ib qho kev sib xyaw transposon. Cov noob feem ntau yog cov tshuaj tiv thaiv kab mob. Lawv tuaj yeem muaj cov noob catabolic. Tsis tas li ntawd, cov khoom sib xyaw ua ke muaj ob qhov rov ua dua.
Daim duab 01: Composite Transposon
Tag nrho qhov ntev ntawm cov khoom sib xyaw ua ke txav mus ua ib chav ua tiav. Tn10 yog qhov sib xyaw ua ke. Nws muaj 6.5 kb hauv nruab nrab coding cheeb tsam (tetracycline-resistant gene) thiab 1.4 kb inverted insertion ib ntu ntawm txhua qhov kawg.
Dab tsi yog cov khoom sib xyaw ua ke?
Non composite transposons yog lwm hom prokaryotic transposons uas tsis muaj qhov sib txuas ua ke flanking ntawm ob kawg. Zoo ib yam li cov transposons sib xyaw, cov tsis sib xyaw transposons muaj cov noob coding rau cov tshuaj tiv thaiv kab mob. Tsis tas li ntawd, lawv muaj qhov rov ua ntu zus ntawm lawv qhov kawg. Cov kev rov ua ntu zus no yog xav tau rau kev hloov pauv. Tn3 yog qhov tsis sib xyaw ua ke. Tn3 non-composite transposon muaj peb lub noob nyob nruab nrab thiab 38 lub hauv paus khub inverted davhlau ya nyob twg rov ua dua. Cov noob nyob rau hauv cov tsis sib xyaw transposons yuav code rau virulence thiab catabolic enzymes uas tsis yog tshuaj tua kab mob. Tn21 yog lwm qhov tsis sib xyaw ua ke.
Dab tsi yog qhov zoo sib xws ntawm Composite thiab Non Composite Transposons?
- Ob qho tib si sib xyaw thiab tsis sib xyaw ua ke muaj cov tshuaj tua kab mob-tiv taus.
- Lawv tau thim rov qab ib yam nkaus.
- Ntxiv mus, lawv yog cov DNA mobile; yog li lawv tuaj yeem txav mus rau hauv genome.
Qhov txawv ntawm Composite thiab Non Composite Transposons yog dab tsi?
Composite transposons yog ib hom transposons uas muaj cov ntsiab lus nkag ntawm lub davhlau ya nyob twg thiab thaj chaw hauv nruab nrab coding. Noncomposite transposons yog ib hom transposons uas tsis muaj flanking insertion sequence ntsiab. Lawv tsuas muaj inverted repeats ntawm txhua qhov kawg. Yog li, qhov no yog qhov sib txawv tseem ceeb ntawm kev sib xyaw thiab tsis sib xyaw transposons. Tn10 yog qhov sib xyaw ua ke thaum Tn3 thiab Tn21 tsis yog cov khoom sib txuas.
Hauv qab infographic qhia txog qhov sib txawv ntawm cov khoom sib xyaw thiab cov tsis sib xyaw ua ke.
Summary – Composite vs Non Composite Transposons
Composite thiab non-composite transposon yog ob hom prokaryotic transposons. Ob hom transposons muaj ib cheeb tsam hauv nruab nrab coding. Txawm li cas los xij, kev sib xyaw transposons muaj ob qhov sib txawv inverted inverted cov kab lus sib txuas thaum tsis sib xyaw transposons tsis muaj flanking insertion sequence. Hloov chaw, lawv muaj cov kab lus rov qab xav tau rau kev hloov pauv. Yog li, qhov no yog qhov sib txawv tseem ceeb ntawm kev sib xyaw thiab tsis sib xyaw transposons. Tn10 yog qhov sib xyaw ua ke thaum Tn3 thiab Tn21 yog ob qho tsis sib xyaw ua ke. Ob hom transposons muaj cov noob coding rau cov tshuaj tiv thaiv kab mob thiab catabolic enzymes. Ntxiv mus, lawv muaj lub davhlau ya nyob twg inverted repeats.
