[ensembl-dev] Obtaining the genomic sequences for all the 5'UTR and CDS for mouse genome

[Allan Kamau]

I would like to obtain the sequences for the 5' UTR and CDS for the mouse
genome.
I began by filtering all the records having "five_prime_UTR" from the
chromosome.<chromosome_name>.gff3.gz files from "
https://ftp.ensembl.org/pub/release-112/gff3/mus_musculus/", I obtain
some 95358 records, it seems this number is too high as mouse genome has
approximately 25,000 genes.

I did the similar filtering for records having the value "CDS" as their
third field and obtained some 522159 entries, which is a large number
considered there are only 25,000 genes for the GRCm39 genome.

What would be preferred way to obtain the 5' UTR and CDS for the entire
mouse genome?

Regards,
-Allan.
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