Somerville residents Grigory Genkin and Irina Kristy, who have been accused of operating a meth lab out of their Oxford Street home, are next scheduled to appear in court in January.

Genkin, 29, was in Somerville District Court Tuesday morning for a pre-trial session, and the court scheduled a probable cause hearing for Jan 24.

Kristy, 74, Genkin's mother, is scheduled to be arraigned on that same day, according to Cara O'Brien, a spokesperson for the Middlesex County District Attorney's office. Kristy was originally scheduled to be arraigned on Dec. 21.

Previously, Genkin has pleaded not guilty to the charges brought against him.

Kristy has worked as a lecturer in mathematics at Boston University and Suffolk University. The Boston Globe reported earlier this month that Suffolk University placed her on administrative leave and Boston University was aware of the situation.

On Nov. 7, police and DEA agents executed a search warrant at Kristy and Genkin's home at 19 Oxford St. The presence of agents in hazmat suits, trucks from the "DEA Clandestine Lab Enforcement Team," a state police bomb squad, which denoted chemicals allegedly found at the site, and news helicopters hovering over the neighborhood caused a stir in Somerville and drew regional attention to the city.

According to Somerville Police Chief Thomas Pasquarello, who spoke at a community meeting in November, police found explosive "shake-and-bake" bottles, used to manufacture methamphetamine, at the home.

A police report, reviewed by Somerville Patch in a court filing, said, "due to the amount of materials and contraband located and seized throughout the target residence, it is believed the mother of Grigory Genkin ... [Irina Kristy,] was complicit in the methamphetamine operation."