article_snippet: The disease usually strikes youngsters when youngsters have learned to walk or talk.
article_snippet: Over time The disease drags a girl's progression backwards so youngsters lose youngsters new skills and are left unable to communicate.
article_snippet: There is no current treatment for the condition but there are hopes of finding a cure.
article_snippet: the condition also affected Coleen Rooney's little sister who died in January 2013.
article_snippet: Sufferers can live to Sufferers 40s and some have been known to live to Sufferers 70s.