DNA methyltransferases zoo li tau ntxim nyiam rau thaj chaw chromatin nrog cov kev hloov kho histone tshwj xeeb. Highly methylated (hypermethylated) DNA cheeb tsam nrog deacetylated histones yog nruj coiled thiab transcriptionally inactive.
DNA yog dab tsi transcriptionally inactive?
Heterochromatin yog kev hloov pauv tsis ua haujlwm ntawm DNA vim yog kev sib txuas ntawm DNA qauv hauv DNA-protein complexes. Gene Amplification: Cov noob tau nthuav tawm nyob rau theem siab, xws li rRNA, tRNA, thiab histone mRNA cov noob feem ntau muaj nyob rau hauv cov ntawv luam siab.
Yuav ua li cas hom chromatin yog transcriptionally inactive?
Ob hom chromatin, heterochromatin thiab euchromatin, yog qhov ua haujlwm thiab cov qauv sib txawv ntawm cov genome. Heterombatin yog densely ntim thiab nkag tau rau cov khoom siv hloov kom yog li nws tau muab cov khoom sib txuas (Richards thiab cov elgaw 2002).
Yuav ua li cas hauv qab no tsis muaj kev hloov pauv?
Nws yog hu ua euchromatin. Nws yog transcriptionally nquag chromatin whereas heterochromatinyog transcriptionally inactive thiab lig replicating los yog heteropycnotic.
DNA yog dab tsi?
Lub Sijhawm: transcriptionally nquag chromatin. Lus Txhais: Qhov kev txiav txim thiab koom ua ke ntawm DNA thiab cov protein uas tsim cov cheeb tsam ntawm cov chromosome uas tau ua haujlwm zoo.
