Researchers announced this week that they’ve found a new gene, ALS6, which is responsible for about 5 percent of hereditary Lou Gehrig’s cases. It’s being called a “momentous discovery” by the Amyotrophic Lateral Sclerosis Association. Scientists at Massachusetts General Hospital, the University of Massachusetts and Kings College in London found the mutation by doing detailed sequencing of the genes in several families with an inherited form of ALS.