Genetics: Chromosome 17 CA10

[forestglip]

Ive just realised I don't know whether CA10 is raised or lowered in DecodeME and the fibro studies

The GWAS studies found that a mutation near the CA10 gene is associated with risk of these conditions, but that doesn't itself provide much detail on what the mutation does, such as whether it upregulates or downregulates CA10 in the brain.

The mutation that increases risk of ME/CFS seems to be associated with increased CA10 in the prostate, based on a different dataset (GTEx), but I would guess the prostate itself is not relevant in these conditions.

We'll need further study to see if we can find out what is actually different about CA10 in ME/CFS (assuming CA10 is even the relevant protein associated with the mutation, which isn't a guarantee).

 

[ScoutB]

The attached PDF is the review.

Wow this is fantastic! Very accessible and info dense. Thanks for sharing.

 

[James Cox]

I've been reading about CA10, and I thought it would be useful to compile what I was reading into a mini-review, for my own and others' future reference.

This isn't meant to include interpretation of how different CA10 findings may fit together, but rather it's basically a compilation of almost all papers reporting CA10 as a main finding, with a quick summary of each one. It likely includes some findings that are based on very limited or weak evidence. Though I did skip some papers with obvious issues, such as genetic studies that didn't use multiple test correction.

The findings related to CA10 that seem strongest to me:

• CA10 is part of the alpha-carbonic anhydrase family, a group of genes which catalyze the reversible reaction that converts carbon dioxide to bicarbonate, yet CA10 itself has no ability to catalyze this reaction.
• CA10 is highly conserved, meaning that its gene sequence has changed very little throughout evolution of different organisms. When a gene is conserved, it suggests that the gene is very important, as mutations which change the gene too much are very detrimental to an organism's ability to pass on its genes.
• CA10 appears to be a tumor suppressor, based on evidence from a variety of tumor types.
• Functional experiments show that CA10 likely plays a key role in neural synapse formation, such as through binding to neurexins and thus preventing heparan sulfate from binding to neurexins. Heparan sulfate itself influences which post-synaptic ligands can bind to pre-synaptic neurexins.
• CA10 may play a role in ME/CFS and pain (GWAS).
• CA10 may play a role in age at first period in women (GWAS).
• Absence of CA10 (or at least the versions in zebrafish) causes severe physical defects and early death in zebrafish.
• Absence or downregulation of a similar gene, CA8, which also has no catalytic activity, is linked to ataxia (problems with muscle coordination and balance) and possibly intellectual disability in humans.

Edit: In case it wasn't clear, the text above is a quick, informal summary. The attached PDF is the review.

Nice one!

 

[James Cox]

Just read back over the thread - great work! Just throwing a question out there for some thoughts. If you were going to focus on a part of the body where CA10 is expressed (e.g. DRG or a particular brain region such as hypothalamus), which region would you focus on that is relevant to the symptoms/pathology in ME/CFS?

 

[James Cox]

And to add to that, within those tissues, which particular subpopulations of cells are likely to be relevant (single cell RNAseq databases are helpful here). Just curious because you guys are miles ahead of me with the ME/CFS literature!!!

 

[forestglip]

Just read back over the thread - great work! Just throwing a question out there for some thoughts. If you were going to focus on a part of the body where CA10 is expressed (e.g. DRG or a particular brain region such as hypothalamus), which region would you focus on that is relevant to the symptoms/pathology in ME/CFS?

Hopefully others provide some ideas, as I'm a beginner in neuroscience, so I don't have a good idea of what areas are most promising in terms of symptoms.

If I was forced to choose an area to study CA10 in, I'd probably look at the cerebellum. It looks to be most highly expressed there, and that seems to be where the similar protein CA8 has its main functions (specifically Purkinje cells), based on the handful of papers about CA8 I read that are cited in the review. I'm not sure if anyone has ruled out that CA10 also interacts with IP3 receptors in those cells in the way CA8 does.