A.İ.B. and his wife E.K.B, who are claimed to be the dentists of Fethullah Gülen, face up to 15 years in prison each, according to Turkish media.
The couple is accused of membership to the Gülen movement, which the government pinned the blame on for July 15 coup attempt.
They were first detained after an Istanbul prosecutor claimed that Zekeriya Öz and Celal Kara, two former prosecutors who are also accused of membership to the movement, took a picture from the balcony of their clinic.
While A.İ.B. has been under arrest for some time, his wife stands trial without arrest as he was released after brief detention.