Lava is said to be a Trans gene and may be the result of another kind of Hypomelanism. I believe it's Hypo D "third Hypo trait"
It is said to be a recessive mutant it acts the same as other hypos reducing the melanin and creates a brighter overall appearance. I do not believe the Lava has anything to do with BR.
The lines are being investigated to determine it's relationship ti other known strains.
Lava's can look like amels with their red wine eye shine due to the reduced melanin but they are not unless made to be amel. A fire is an Amel BR