The CNN (2/4, Henry) “The Chart” blog reported that researchers from the University of Miami say they have “identified a new gene that causes” retinitis pigmentosa. In a study published in the American Journal of Human Genetics, scientists detailed how “the gene was discovered by studying the genes of the Lidsky family, where three of four children experienced this form of vision loss.” Then, after modeling the family’s genes in zebra fish, the investigators found that “affected individuals have the same mutation in two copies — that is, they were homozygous” for the trait.