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Quá trình phát sinh sinh học của các miRNA
Tương tự siRNA, miRNA là những đoạn RNA ngắn (khoảng 21-25 nu); tuy nhiên, quá trình phát sinh của chúng có khác biệt rõ ràng so với các siRNA. Các tiền thân cơ sở của miRNA (
pri-miRNA) được mã hóa trong hệ gen, và các vùng gen tương quan hầu hết được phiên mã bởi enzim RNA polymerase II. Các tiền thân cơ sở của miRNA - có cấu trúc dạng thân vòng (stem-loop) - chứa miRNA ở nửa 5’ hoặc nửa 3’ của mạch. Trong quá trình phát sinh miRNA ở thực vật, 1 loại RNase III protein số hiệu 1 tương tự với Dicer (Dicer like protein 1 hay DCL1) – có tác dụng cấu tạo nên cặp miRNA-miRNA* trong nhân (miRNA* là mạch bổ sung của miRNA trong cấu trúc thân vòng, tương đương với
mạch khách (passenger strand) của cặp phân tử siRNA, sẽ thảo luận sau). Còn với động vật thì các miRNA lại phát sinh thông qua 1 quá trình gồm 2 bước, trong đó enzim Drosha RNaseIII nằm trong nhân sẽ cố định 1 đầu của cặp miRNA-miRNA* và giải phóng phần tiền thân miRNA (pre-miRNA) dài 65-70 nu. Tiền thân miRNA dạng kẹp tóc này sau đó được xuất ra ngoài tế bào chất để Dicer hoàn tất quá trình này.