The muscle growth limiting protein myostatin (as explained in the MSTN gene report) is affected by a protein encoded by the ACVR1B gene. One variation of ACVR1B has been associated with increased strength.
Global population distribution:
Source: 1000 Genome Project. Global averages for both sexes
More about ACVR1B
THE ACVR1B GENE
The ACVR1B gene encodes for the activin receptor type-1B and it is thought to play a role in myostatin signalling in muscle. The variation we look at is still relatively unexplored and we are waiting for further studies to fully understand how it affects strength.