Qhov Tseem Ceeb Qhov txawv - Stem Cells vs Differentiated Cells
Multicellular kab mob yog tsim los ntawm ntau txoj kev loj hlob. Lub hauv paus rau kev loj hlob yog diploid (2n) zygote uas yog tsim los ntawm fertilization. Lub zygote tseem sib faib thiab sib txawv. Stem cells yog cov hlwb tsis txawv txav uas tsis yog tshwj xeeb rau kev ua haujlwm tshwj xeeb tab sis muaj peev xwm sib txawv rau hauv cov hlwb tshwj xeeb thaum cov hlwb sib txawv yog hom hlwb uas tau raug hloov kho tshwj xeeb epigenetic thiab muaj cov haujlwm tshwj xeeb hauv lub cev. Qhov no yog qhov sib txawv tseem ceeb ntawm cov qia hlwb thiab cov hlwb sib txawv.
Stem Cells yog dab tsi?
Cov qia hlwb tuaj yeem txhais tau tias yog cov hlwb tsis sib xws uas tsis yog tshwj xeeb rau kev ua haujlwm tshwj xeeb. Stem cells muaj peev xwm sib txawv rau hauv cov hlwb tshwj xeeb thiab tseem tuaj yeem ua rau ntau cov qia hlwb los ntawm mitosis. Stem cells feem ntau pom muaj nyob rau hauv ntau cov kab mob. Lawv muaj peev xwm txhim kho mus rau ntau hom cell thaum lub neej thaum ntxov thiab thaum lub sij hawm loj hlob ntawm lub cev. Yog li ntawd, thaum lub sij hawm faib cov qia hlwb, nws tuaj yeem dhau los ua lwm hom cell tshwj xeeb lossis nyob twj ywm raws li qia cell.
Nws muaj ob yam tshwj xeeb ntawm cov qia hlwb uas pab kom paub qhov txawv ntawm lwm lub hlwb. Ua ntej lawv yog cov hlwb tsis tshwj xeeb uas tuaj yeem rov ua dua lawv tus kheej ntawm kev faib tawm ntawm tes txawm tias tom qab qee lub sijhawm tsis ua haujlwm. Piv txwv li, nyob rau hauv lub cev xws li cov pob txha pob txha, muaj kev faib cov qia hlwb kom kho thiab hloov cov ntaub so ntswg puas. Thiab qhov thib ob, lawv muaj peev xwm loj hlob mus rau hauv cov ntaub so ntswg lossis cov kab mob tshwj xeeb hauv lub cev. Stem cells faib nyob rau hauv tshwj xeeb tej yam kev mob nyob rau hauv lub cev xws li lub plawv, thiab lwm yam.
Cov qia hlwb muaj ntau qhov sib txawv. Lawv tuaj yeem raug categorized li totipotent, pluripotent thiab multipotent. Totipotent qia hlwb muaj peev xwm sib txawv rau hauv embryonic cell hom. Cov hlwb no yog tsim los ntawm kev sib xyaw ntawm qe thiab phev. Yog li ntawd, cov khoom siv tau zoo tuaj yeem tsim tau. Pluripotent qia hlwb yog tsim los ntawm cov hlwb totipotent thiab muaj peev xwm sib txawv rau yuav luag txhua hom cell, thiab lawv tau muab los ntawm peb txheej kab mob. Multipotent qia hlwb muaj peev xwm sib txawv rau ntau lub hlwb ntawm tib tsev neeg.
Daim duab 01: Stem Cell
Ob hom qia hlwb siv rau kev tshawb fawb tam sim no, thiab lawv yog embryonic qia hlwb thiab cov neeg laus qia hlwb / somatic qia hlwb. Embryonic qia hlwb yog cov hlwb uas muaj nyob rau hauv lub blastocyst thiab nyob rau hauv lub embryo ntawm 3 mus rau 5 hnub tom qab fertilization. Lawv yog pluripotent, thiab yog li ntawd, tag nrho cov derivatives ntawm peb txheej kab mob yog tsim los ntawm embryonic qia hlwb. Cov neeg laus los yog somatic qia hlwb yog cov qia hlwb uas kho thiab tswj cov ntaub so ntswg puas. Feem ntau cov neeg laus qia hlwb muaj ntau lub zog thaum pluripotent qia hlwb tsis tshua pom. Cov pob txha pob txha yog ib qho piv txwv ntawm cov neeg laus qia hlwb uas siv rau ntau yam kev kho mob.
Dab tsi yog cov Cell sib txawv?
Differentiated cells yog ib hom hlwb uas tau raug hloov kho epigenetic tshwj xeeb nyob ntawm cov ntaub so ntswg thiab teb rau ib puag ncig thiab kev loj hlob stimuli. Nyob rau hauv nam ntawm cellular sib txawv, nws yog ib tug txheej txheem uas tsawg tshaj plaws tshwj xeeb hlwb hloov mus rau ib lub xeev ntawm ntau tshwj xeeb cell hom. Cellular sib txawv yog suav tias yog ib qho tseem ceeb ntawm kev loj hlob biology. Los ntawm kev sib txawv ntawm tes, cov ntaub so ntswg sib txawv hauv lub cev tau muab nrog ntau hom cell. Cell sib txawv yog tshwm sim los ntawm qhov pib ntawm kev loj hlob ntawm ib tug multicellular kab mob. Los ntawm fertilization, ib tug poj niam gamete yog fused nrog ib tug txiv neej gamete uas yuav tshwm sim nyob rau hauv lub tsim ntawm ib tug zygote nyob rau hauv diploid (2n) theem.
Zygote yog thawj qhov chaw ntawm kev sib txawv ntawm tes. Ntawm no, feem ntau cov ntaub so ntswg ntawm lub cev yog tsim los ntawm kev sib txawv ntawm tes. Tsis zoo li cov qia hlwb, uas tsis muaj qhov sib txawv, cov hlwb sib txawv muaj kev ua haujlwm zoo dua hauv lub cev. Kev sib txuas ntawm cov qia hlwb thiab cov hlwb sib txawv yog cov hlwb sib txawv yog tsim los ntawm kev faib cov qia hlwb rau hauv cov menyuam ntxhais sib txawv. Qhov no feem ntau tshwm sim nyob rau hauv cov neeg laus raws li ib tug tshwm sim thaum lub sij hawm kho cov ntaub so ntswg cov txheej txheem thiab ib txwm cell turnover.
Daim duab 02: Daim duab qhia seb Embryonic Stem Cells txawv li cas
Differentiated cells yog tsim nyob rau hauv xws li qhov loj thiab cov duab ntawm lub undifferentiated hlwb hloov. Tsis tas li ntawd, kev sib txawv ntawm tes ua rau muaj kev hloov pauv hauv kev ua haujlwm hauv metabolic thiab cov lus teb rau stimuli. Kev sib txawv ntawm tes tsis ua rau muaj kev hloov pauv hauv DNA ib ntus. Tab sis nws yog ib qho tseem ceeb uas yuav tsum tau hais tias kev sib txawv ntawm tes muaj peev xwm ua rau hloov cov noob uas tsis tsim nyog rau cov ntaub so ntswg.
Dab tsi zoo sib xws ntawm Stem Cells thiab Differentiated Cells?
- Ob cov qia hlwb thiab cov hlwb sib txawv muaj nyob rau hauv cov txheej txheem kev loj hlob ntawm ntau lub cev.
- Stem cells yog sib txawv rau hauv cov hlwb tshwj xeeb.
Qhov txawv ntawm Stem Cells thiab Differentiated Cells yog dab tsi?
Stem Cells vs Differentiated Cells |
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| Cov qia hlwb tuaj yeem txhais tau tias yog cov hlwb tsis muaj kev sib txawv uas tsis yog tshwj xeeb rau kev ua haujlwm tshwj xeeb tab sis muaj peev xwm sib txawv rau hauv cov hlwb tshwj xeeb. | Differentiated cells yog hom hlwb uas tau raug hloov kho epigenetic tshwj xeeb nyob ntawm cov ntaub so ntswg thiab teb rau ib puag ncig thiab kev loj hlob stimuli. |
| Muaj nuj nqi tshwj xeeb | |
| Stem cells tsis muaj qhov tshwj xeeb. | Cov hlwb sib txawv muaj cov haujlwm tshwj xeeb. |
Summary – Stem Cells vs Differentiated Cells
Los ntawm fertilization, ib tug poj niam gamete yog fused nrog ib tug txiv neej gamete uas yuav ua rau tsim ib tug zygote uas yog diploid (2n). Lub zygote faib tsis tu ncua nyob rau hauv kev loj hlob theem ntawm ib tug multicellular kab mob. Cov qia hlwb tuaj yeem txhais tau tias yog cov hlwb tsis muaj kev sib txawv uas tsis yog tshwj xeeb rau ib qho kev ua haujlwm. Tab sis lawv muaj peev xwm sib txawv rau hauv cov hlwb tshwj xeeb lossis ua rau ntau cov qia hlwb los ntawm mitosis. Ob hom qia hlwb tau siv rau kev tshawb fawb tam sim no, thiab lawv tau hu ua embryonic qia hlwb thiab cov neeg laus / somatic qia hlwb. Cov hlwb sib txawv yog hom hlwb uas tau raug hloov kho epigenetic tshwj xeeb nyob ntawm cov ntaub so ntswg thiab teb rau ib puag ncig thiab kev loj hlob stimuli. Cov hlwb sib txawv muaj lub luag haujlwm tseem ceeb dua li cov qia hlwb. Nov yog qhov txawv ntawm cov qia hlwb thiab cov hlwb sib txawv.
