How to find and download the Database from a particular gene in NCBI

Question

[a.mailli]

I am interested in mapping some mRNA reads on a particular gene from community samples to compare the expression levels between samples. There is apparently a method that you can use with the NCBI database, specifically by downloading the whole database of that particular gene.Could you please elucidate as to how that can be done? Thank you.

[GenoMax]

whole database of that particular gene

What do you mean by that? A particular gene from many species? How are you planning to map mRNA reads to such a set?

[WouterDeCoster]

There is apparently a method that you can use with the NCBI database,

Could you clarify where you got that? That might explain us a little more.

[mastal511]

Sounds like the OP is maybe referring to metagenomics?

[WouterDeCoster]

That's not what I initially made of it, but given that it's all a bit vague everything is possible.