Ukuguqula Ukuhlelwa Kwezakhi Zofuzo: Inkqubela phambili kwiTekhnoloji yeCRISPR/Cas kwiZicelo zeBiomedical
Itekhnoloji yeCRISPR/Cas, eyafunyanwa okokuqala njengenkqubo yokuzikhusela eguquguqukayo kwiiprokaryotes ukuze ibone kwaye inqumle ii-nucleic acids ezihlaselayo, iguqukele ekubeni sisixhobo esinamandla sokuhlela iijini kwiiseli zezilwanyana ezincancisayo. Iproteni yeSpCas9, ethathwe kwi I-Streptococcus pyogenes, yiprotheyini yokuqala yeCas ephinde yasetyenziselwa ukuhlela i-genome, ixhomekeke kwi-RNA yesikhokelo sokwenziwa (sgRNA) ukujolisa ulandelelwano oluthile lwe-nucleotide ngaphakathi kwi-genome.
I-sgRNA iqulathe ulandelelwano lwe-scaffold olufunekayo kwi-Cas9 binding kunye ne-20-nucleotide spacer enokuguqulelwa ngokwezifiso echaza i-genomic target. Ukuze kubekho i-double-strand breaks esebenzayo (DSB), ulandelelwano lwe-spacer kufuneka luhlangabezane neendlela ezimbini: akufuneki luhambelane nezinye ii-genomic DNA kwaye kufuneka lube kufutshane ne-protospacer adjacent motif (PAM) sequence, ebaluleke kakhulu kwi-Cas9 binding.
Umsebenzi wokusika kabini weCas9 uxhomekeke kwiindawo zayo ezimbini ezisebenzayo, iRuvC kunye neHNH, okuvumela ukwakheka kweDSB ngokuchanekileyo. Abaphandi baphuhlise iindlela ezahlukeneyo zokusetyenziswa besebenzisa inkqubo yeCRISPR/Cas, kuquka:
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Uvavanyo lweGenome Knockout epheleleyo: Ngokwakha ithala leencwadi elibanzi le-sgRNA kunye nokusebenzisa uxinzelelo olukhethiweyo, abaphandi banokuchonga iijini ezibalulekileyo ekusindeni kweeseli phantsi kweemeko ezahlukeneyo.
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Ukusebenza kweGene kunye nokuNciphisa: Besebenzisa i-dCas9, engenawo umsebenzi we-nuclease, abaphandi banokulawula ukubonakaliswa kwezakhi zofuzo ngokudibanisa i-dCas9 kunye ne-transcriptional activators okanye ii-repressors, nto leyo evumela ukuphononongwa okuneenkcukacha kwemisebenzi yezakhi zofuzo.
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Ukuhlelwa kwe-Epigenetic: I-dCas9 inokwakhiwa ukuze iguqule i-DNA okanye i-histones, okuvumela utshintsho olujoliswe kwi-epigenetic olunokunyusa okanye luthulise ukubonakaliswa kwe-gene.
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Umfanekiso weChromatin: Ngokudibanisa i-dCas9 neeproteni ezikhanyayo, izazinzulu zinokubona iindawo ezithile ze-genomic kwiiseli eziphilayo, nto leyo ephucula ukuqonda kwethu i-chromatin dynamics.
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Ukuchongwa kweeProteni eziBopha iDNA/RNA: Ukudibanisa i-CRISPR/Cas kunye neetekhnoloji zokubhala iilebhile zokusondela kwenza ukuba kuchongwe iiproteni ezisebenzisana nemimandla ethile ye-genomic.
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Uphuhliso lweeMolekyuli: Le nkqubo inokungenisa utshintsho kwiindlela zeDNA ezijoliswe kuzo, nto leyo enceda ekufundweni komsebenzi wejini phantsi koxinzelelo olukhethiweyo.
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Ukufakwa kweTransposon-Mediated: Ngokudibanisa iiproteni zeCas kunye nee-transposases, abaphandi banokufikelela ekuhlanganisweni okusebenzayo kwe-DNA yangaphandle kwi-genome.
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Ukucinywa kweZiqwenga Ezikhulu: Inkqubo yeCRISPR-Cas3 ivumela ukususwa kweenkqubo ezinkulu zeDNA, nto leyo ebonelela ngeendlela ezintsha zonyango losulelo lwentsholongwane.
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Indawo yokugcina imemori: Ii-gRNA ezizijolisa ngokwazo zinokudala utshintsho oluhlala luhleli olusebenza njengeempawu zebhayoloji zeziganeko ezithile, zivula indlela yokulandelela iimpendulo zeseli ngendlela ephucukileyo.
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Ukufunyanwa kweNtsholongwane: Iinkqubo zeCRISPR/Cas zisetyenziswe ngempumelelo ekufumaneni ngokukhawuleza iintsholongwane, kuquka iHIV kunye neSARS-CoV-2, nto leyo ephucula amandla okuxilonga.
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Uyilo lweGene Therapy: Ukwaziswa kweyeza lokuqala lokuhlela izakhi zofuzo elisekelwe kwiCRISPR/Cas9, iCASGEVY™, limele inyathelo elibalulekileyo ekunyangeni isifo se-sickle cell (SCD) kunye ne-β-thalassemia (TDT) exhomekeke kwi-transfusion-dependent transfusion. Eli yeza, elivunyiweyo kwiindawo ezininzi, libonisa amandla okulungisa izakhi zofuzo ukuguqula iindlela zonyango.
Njengoko icandelo lokuhlela izakhi zofuzo liqhubeka lihambela phambili, ukusetyenziswa kwetekhnoloji yeCRISPR/Cas kuyanda ngokukhawuleza. Ngotyalo-mali olukhulu lukarhulumente kwi-biotechnology kunye neyeza elichanekileyo, kukho inkqubela phambili eqhubekayo kunyango lokuhlela izakhi zofuzo kwizifo ezahlukeneyo, kubandakanya iingxaki zezakhi zofuzo, umhlaza, kunye Izifo ezichaphazela umzimba.