WASHINGTON (Reuters) - Four separate studies published on Sunday identify a series of genes linked with lupus, a debilitating illness that can affect various parts of the body at once. The studies show that, as suspected, the immune system is going haywire in lupus. But it also points to some previously unsuspected causes of the once-mysterious disease.And the findings may not only help scientists find better treatments for the disease -- but may help in diagnosing it in the first place, as it is easily confused with other conditions.