Four veteran prosecutors have filed a gender and age discrimination lawsuit against the Contra Costa County District Attorney’s Office and District Attorney Diana Becton.

Lawyers for Mary Knox, Rachel Piersig, Alison Chandler and Mary Blumberg, all deputy district attorneys in the office, filed a complaint in federal court Wednesday claiming that the office has a “long and pervasive culture of systemic gender discrimination.” The lawsuit, which brings state and federal claims of gender and age discrimination as well as retaliation claims, alleges that since Becton took office the women have been passed over for supervisory positions and, in certain instances, have been replaced by male candidates with less experience.