Transcription and translation

[flodhi1]

Okay so I know that replication occurs in the S phase. I also know that protein synthesis occurs in the G1 phase. So obviously translation occurs in the G1 phase. However now here's where i'm struggling.
I don't know if transcription would be occurring in the G1 phase or S phase.

My attempt/logic:- DNA is synthesized in the S phase and no protein synthesis is occurring therefore there would be no NEED for transcription/ mRNA in the S phase. However since you are already producing proteins in the G1 phase you obviously need mRNA thus transcription probably occurs in the G1 phase followed with translation. Also there is organelle production/ cytoplasm formation in the G2 phase so shouldn't there also be transcription and translation in G2 phase. So my final guesstimate is that transcription and translation both occur in the G1 and G2 phase.

😕

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[loveoforganic]

I could very well be wrong here since I'm just working on logic and not anything I've actually heard, but I don't think transcription and translation would ever stop for any meaningful period throughout the cell. Regardless of what the cell is doing reproductively, proteins it needs will be degraded and need to be replenished, the cell will be exposed to new environmental conditions it has to respond to, etc.

 

[ilovemcat]

Organic is right. Just to add onto what he said, proteins and mRNA especially have a limited life span. In fact, a key feature of genetic expression is the result of the variability of mRNA stability. Some mRNA strands last a few minutes, others can last for several days. Transcription and Translation go hand in hand. During G1 Phase, the cell is preparing for chromosome replication and is actively transcribing and translating strands of mRNA.