I think https://healthecco.org/ has a knowledge graph that contains genomics data.
Also there are a number of additional projects in that space, check out our life-sciences page and last year's workshop:
Like Michael mentioned: A couple of people in the HealthECCO community worked with gene expression data already. Have a look at our bi-weekly community calls: https://healthecco.org/healthecco/healthecco-community-calls/
Feels free to join a call and we can try to point you in the right direction!