Post transcriptional gene control III - Micro RNA (miRNA)

4 important questions on Post transcriptional gene control III - Micro RNA (miRNA)

What is the seed region of miRNA?

The most important region for targeting specific mRNA, nucleotides 2-7

What are the 9 steps of biogenisis of miRNA and accociation with RISC?

1. Pri-miRNA synthesized by RNA Pol II
2. Endoribonuclease DROSHA and associated protein bind pri-miRNA
3. DROSHA cleaves pri-miRNA strands
4. DROSHA dissociates releasing pre-miRNA (2 nucleotide overhang)
5. Pre-miRNA is transported to the cytoplasm by Exportin5
6. Dicer associated with TRBP binds pre-miRNA
7. Dices cleaves pre-miRNA strands (2 nucleotide overhang)
8. Dices dissociates releasing miRNA
9. Association with RISC of functional strand

What is the function of siRNA?

It can manipulate gene expression
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How can you analyze miRNAs and their funciton?

1. Northern blot hybridization
2. Quantitative RT-qPCR
3. Microarray
4. Western blotting
5. Mass spectrometry

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