Hi everyone.

I found Different ENSG IDs for the same gene_name in gtf file (gencode.v26.annotation.gtf).

For example:
"ENSG00000273544.1" and "ENSG00000252840.1" both have a gene_name "SNORA44".

I searched for these ENSG IDs on ensemble, and got 2 answer:
ENSG00000273544.1 is a 132bp snoRNA at Chromosome 1: 28,580,381-28,580,512;
ENSG00000252840.1 is a 108bp snoRNA at Chromosome 1: 151,527,831-151,527,938;

So why do they share the same gene_name?

Thank you in Advance.
These cases happen very often. In this particular instance, notice that you are using an old version of GENCODE, 26.

If you check the latest [GENCODE 39][1], you can see that ENSG00000273544.1 is the correct entry for this gene symbol. You can also check [Gene Cards][2] where you will see that there is only one ensembl id. Finally, the [ensembl page][3] for the other id shows that ENSG00000252840 is no longer associated with the symbol SNORA44.

  [1]: https://www.gencodegenes.org/human/
  [2]: https://www.genecards.org/cgi-bin/carddisp.pl?gene=SNORA44
  [3]: https://www.ensembl.org/Homo_sapiens/Gene/Summary?db=core;g=ENSG00000252840;r=1:151527831-151527938;t=ENST00000517031