Question

Explain the processing of heterogeneous nuclear RNA (hnRNA) into a fully functional mRNA in eukaryotes. Where does this processing occur in the cell?

Hint:

mRNA processing ensures the stability and proper translation of genetic information in eukaryotic cells.

Answer 1

Eukaryotic hnRNA undergoes processing to form mRNA through these stages:
- Capping: Attachment of a methyl guanosine cap to the 5’ end of hnRNA enhances stability and facilitates ribosome binding. 
- Tailing: Addition of a poly-A tail to the 3’ end of hnRNA protects against degradation and improves translation. 
- Splicing: Removal of introns (non-coding segments) and ligation of exons (coding segments) yield mature mRNA. This entire process takes place within the nucleus of eukaryotic cells.