I have done a search for this hypothesis to already exist but I have not found any previously published work so here goes…..
One of the very hardest things to try to explain with respect to evolution is the notion that something relatively complex like transcription and translation came together and live made a huge quantum leap.
I am suggesting that Adenine and Uracil (if RNA world hypothesis is accurate,) were the only nitrogenous bases in the very earliest organisms and Guanine and Cytosine mutated from A and U (T).
The other thing needed by something to be alive is energy to keep the delta G from being zero (insert evil scientist laugh.) Adenine looks like….would you lookie at that, ATP!
The two things that make something alive is replication-transcription-translation using either DNA or, more likely, RNA and ATP.
If life started with A and U (T) andemerging life required 20 amino acids, and a start and at least one stop. Early codons would be quintuplet instead of triplicate. and we would have 32 quintuplet codons insteaad of 64 presenting a lot less redundency.
Adenine would also double as energy-rich ATP. If this happened, it would be a beautiful case of less being more.