Yadda CRISPR/Cas9 ke Canja Magani, daga Kariyar Kwayoyin cuta zuwa Madaidaicin Salon Farko

A ƙarshen karni na 20, masana kimiyya da ke nazarin kwayoyin halittar ƙwayoyin cuta sun gano jerin jerin maimaita maimaitawar da ba a saba ba - daga baya mai suna CRISPR. Da farko, ba a san aikinsu ba. Bayan lokaci, duk da haka, bincike ya nuna cewa waɗannan jeri sun kasance wani ɓangare na "tsarin ƙwaƙwalwar ajiyar rigakafi" na kwayan cuta da ake amfani da su don kare kamuwa da cututtuka.

Lokacin da kwayar cuta ta cutar da kwayoyin cuta, kwayoyin cutar suna ɗaukar gutsuttsuran DNA ɗin hoto kuma suna "ajiya" a cikin jerin CRISPR. Idan irin wannan nau'in kwayar cutar ta sake kai hari, kwayoyin cutar za su iya gane ta ta hanyar daidaitaccen tsarin niyya kuma ta yanke DNA ta hoto mai hoto.^[1].

Sunadaran da ke da alhakin wannan aikin "almakashi na kwayoyin halitta" shine Cas9. Wannan binciken ya sa masana kimiyya su gane cewa idan za a iya tsara "jerin yin niyya" ta hanyar wucin gadi, CRISPR/Cas9 za a iya rikidewa zuwa tsarin tsarawa - kayan aikin gyarawa.

4. Babban Injiniyan Gyaran Halittu: Ta yaya CRISPR/Cas9 “Yanke”?

Tsarin gyaran kwayoyin halitta na CRISPR - Cas9 ya ƙunshi manyan abubuwa guda biyu:

• gRNA (jagora RNA): alhakin "niyya" ta hanyar gane takamaiman jerin DNA
• Cas9 protein: alhakin "yanke" ta hanyar gabatar da raƙuman ruwa biyu a cikin DNA

Ana iya fahimtar ainihin tsarin aikin sa a matakai uku:

Akwai hanyoyin gyaran farko guda biyu:

• NHEJ (Ba - Ƙarshen Ƙarshen Ƙarshen Homologous): yana gabatar da shigarwa ko gogewa, yana haifar da rushewar kwayoyin halitta (knockout)
• HDR (Homology-Gyara Kai tsaye): yana ba da damar madaidaicin maye ko sakawa (ƙwanƙwasa - ciki)

Wannan tsarin shine abin da ya sa Cas9 ya zama mafi inganci kuma mai dacewa da kayan aikin gyara da ake samu a yau.

3. Daga Bench zuwa Bedside: Aikace-aikace na CRISPR/Cas9 a cikin Magungunan Kwayoyin cuta
4. 1) CAR

Maganin gargajiya na CARex vivo, sa'an nan kuma mayar da su cikin jiki. Wannan tsari ba kawai lokaci ba ne kawai amma kuma yana da tsada, yana iyakance manyan aikace-aikacen sa.

Tare da ƙaddamar da fasahar CRISPR-Cas9, duk da haka, yadda CAR-T sel ke yin aikin injiniya yana fuskantar gagarumin sauyi, yana mai da "duniya" CAR-T magani yana ƙara yiwuwa. Ta hanyar daidaitaccen gyare-gyaren kwayoyin halitta na ƙwayoyin T, za a iya fitar da kwayar halittar TCR don hana dasawa - da - cutar mai masaukin baki (GVHD). A lokaci guda, fitar da kwayoyin halittar da ke da alaƙa na rigakafi kamar A2AR na iya haɓaka juriya da juriya na ƙwayoyin CAR - T a cikin saitunan asibiti.^[2].

Bugu da kari, shafin - takamaiman shigar da ginin CAR zai iya haɓaka ikon sel don ganewa da kashe antigens ƙari. Sakamakon haka, maganin CAR

2）Gene-Edited Cell Therapy: Yiwuwar Bayan Ciwon daji

CRISPR-Cas9 ya nuna babban alkawari ba kawai a cikin maganin rigakafi na ciwon daji ba amma kuma yana haɓaka cikin sauri cikin maganin cututtukan ƙwayoyin cuta da yawa. Misali, a cikin yanayi irin su cutar sikila da β-thalassaemia, masu bincike suna gyara ƙwayoyin sel na hematopoietic don dawo da maganganun haemoglobin na yau da kullun, don haka magance cutar a tushenta da haɓaka sakamakon asibiti.

A halin yanzu, ana amfani da hanyoyin isarwa kamar ƙwayoyin cuta na ƙwayoyin cuta, nanoparticles na lipid (LNPs), da ƙwayoyin cuta - ƙwayoyin cuta (VLPs) don amfani da su sosai a cikin hanyoyin gyaran ƙwayoyin halittar vivo [3].

Gabaɗaya, babban ƙa'idar waɗannan hanyoyin ita ce gyara kai tsaye "cuta-mai haifar da kwayoyin halitta," maimakon kawai rage alamun.

4. Gaskiya - Al'amuran Duniya: Ana Ci Gaban Tallafin Kasuwa

Maganin CAR Misali, Kymriah, samfurin CAR Wannan ya biyo bayan Yescarta, wanda ya nuna cikakkiyar ƙimar amsawa a cikin manyan ƙwayoyin lymphoma B-cell, yana ƙara tabbatar da ƙimar asibiti na CAR-T far. A halin yanzu, Carvykti, wanda ke niyya BCMA, ya inganta sosai duka zurfi da dorewar martani a cikin marasa lafiya tare da myeloma da yawa.

Waɗannan nasarorin na gaske - duniya sun nuna cewa CAR - T far yana sake fasalin yanayin maganin cutar kansa. A lokaci guda, haɗin CRISPR - Fasahar Cas9 tana tuƙi CAR - T daga “ keɓaɓɓen keɓancewa” zuwa “ƙirar injiniya.” Ta daidai buga fitar da kwayoyin halitta irin su TCR da PD-1, yana yiwuwa a rage ƙin yarda da rigakafi yayin haɓaka ayyukan antitumor. Wannan kuma yana ba da goyan bayan fasaha mai mahimmanci don haɓaka samfuran “kashe - Shelf” samfuran tantanin halitta na duniya, haɓaka ilimin tantanin halitta zuwa mafi girman daidaito da haɓaka.

CRISPR - Cas9 don haka ya samo asali daga “kayan aikin bincike” zuwa “dandali na haɓaka magunguna.”

5. Kalubalen Fasaha: Yaya Nisa Muke Da Kammala?

Duk da babban alkawarinsa, CRISPR - Cas9 har yanzu yana fuskantar ƙalubale masu amfani da yawa a cikin ainihin - aikace-aikacen duniya. Misali, kashe - Tasirin manufa na iya haifar da yuwuwar haɗarin aminci. Hakanan tsarin bayarwa yana buƙatar ƙarin haɓakawa cikin inganci da aminci. Bugu da kari, furotin Cas9 kanta na iya haifar da martanin rigakafi a wasu lokuta. A lokaci guda, damuwa na ɗabi'a-musamman kewaye da gyaran ƙwayoyin ƙwayoyin cuta - dole ne a kusanci su da taka tsantsan.

Don magance waɗannan batutuwa, masu bincike suna aiki sosai akan gyare-gyaren fasaha. Waɗannan sun haɗa da haɓaka manyan bambance-bambancen Cas9 na aminci (kamar HiFi Cas9) don rage kashe - Ayyukan manufa, da kuma ci gaban sabbin dabaru kamar gyara tushe da babban gyara, waɗanda ke da nufin haɓaka daidaito da ikon sarrafa tsarar halitta.

6. Mahimmanci na gaba: "Tsarin Aiki" na farfadowa na salula

Idan magungunan rigakafin suna wakiltar "madaidaicin bugu," to CRISPR/Cas9 ya fi kama da "sake rubuta lambar rayuwa." Hanyar gaba tana ƙara fitowa fili:

1. Kashe-kwayoyin kwantar da tarzoma
   Haɓaka manyan masana'antu don rage farashi
2. Multiplex gene tace
   gyare-gyare na lokaci guda na ƙwayoyin halitta masu yawa don haɓaka ingantaccen magani
3. In vivo gyara
   Jiyya kai tsaye a cikin jikin mutum, kawar da buƙatarex vivomagudin salula
4. AI + gyaran kwayoyin halitta
   Amfani da hankali na wucin gadi don inganta ƙirar gRNA da rage kashe - haɗarin manufa

Kammalawa: Daga "Almakashi" zuwa Tsarin tiyata

Fitowar CRISPR/Cas9 na da, a karon farko, an bai wa bil'adama ikon daidaita kwayoyin halitta. A fagen CAR-T da kuma maganin tantanin halitta, yana haifar da sauye-sauye daga "maganin cuta" kawai zuwa "sake gina tsarin halitta."

Ana sa ran gaba zuwa shekaru goma masu zuwa, gyaran kwayoyin halitta tare da maganin tantanin halitta ana sa ran ya zama babban injin na zamani na gaba na biomedicine. CRISPR/Cas9 yana tsaye a ainihin mafarin wannan canji.

Magana

• [1] Doudna J A, Charpentier E. Sabuwar iyakar injiniyan kwayoyin halitta tare da CRISPR - Cas9[J]. Kimiyya, 2014, 346 (6213): 1258096.
• [2] Giuffrida L, Sek K, Henderson MA, et al. CRISPR/Cas9 shafewar mai karɓar adenosine A2A yana haɓaka ingancin ƙwayoyin CAR T [J]. Sadarwar yanayi, 2021, 12 (1): 3236.
• [3] Raguram A, Banskota S, Liu DR. Therapeuticin vivoisar da wakilai masu gyara kwayoyin halitta[J]. Cell, 2022, 185 (15): 2806-2827.