This didn't establish a causal mechanism or even whether this particular enzyme is a contributing factor. It looked at an enzyme also associated with disfunctio

This didn't establish a causal mechanism or even whether this particular enzyme is a contributing factor. It looked at an enzyme also associated with disfunction of the autonomic nervous system & finding that it is associated with SIDs deaths, but not other deaths. This is additional evidence supporting a hypothesis advanced in the last decade associating SIDs deaths with a reflex that causes infants to stop breathing instead of try to breath faster when they aren't getting enough oxygen. It doesn't establish much on its own, but it could enable screening for at-risk children, and eventually enable interventions that address the root cause. (Current interventions are mostly about attempting to ensure infants never experience a drop in oxygen that could trigger that reflex, which can never reduce the risk to zero.)