Gore's 100-yard rushing game was the first for the Golden Eagles' since De'Michael Harris did it on Nov. 16, 2019.
Abram threw a 22-yard touchdown pass to Demarcus Jones and Gore ran it in from 11 yards out to give Southern Mississippi a 14-3 lead in the game's first 4 1/2 minutes.
The Mean Green's Tre Siggers capped an 80-yard scoring drive with a 1-yard scoring run with 1:54 before halftime. But Southern Mississippi (1-3, 1-1 Conference USA) drove 46 yards in 70 seconds, and Briggs Bourgeois kicked a 46-yard field goal to put the Golden Eagles up 20-10 at intermission.
Mayberry's 4-yard scoring run early in the fourth quarter stretched Southern Mississippi to its largest lead at 34-17.
Austin Aune threw for 330 yards and two scores for North Texas (1-2, 0-1).
With Larry Scott's tenure coming to an end, what's next for Pac-12?
Kyle Bonagura reports on Larry Scott's tenure as Pac-12 commissioner coming to an end this June after an 11-year run.
Larry Scott's 11-year run as Pac-12 commissioner to end in June
Larry Scott's 11-year run as Pac-12 commissioner will end in June, the conference said Wednesday night.
Oklahoma State Cowboys' Mike Gundy among 6 in Oklahoma Sports Hall of Fame class
Oklahoma State football coach Mike Gundy will join Roy Clymer, Stacey Dales, Dan Hays, Robert Kalsu and Gene Stephenson as inductees into the Oklahoma Sports Hall of Fame Class of 2021.
Henry To'o To'o among 4 Tennessee football players to enter portal after Jeremy Pruitt firing
Henry To'o To'o, a former SEC All-Freshman linebacker who started 22 games for the Tennessee Volunteers over the past two seasons, was among four Vols to enter the transfer portal on Wednesday.
Antonio Pierce named Arizona State Sun Devils' solo defensive coordinator; Marvin Lewis stays on staff
Antonio Pierce has been named Arizona State's sole defensive coordinator, in a move that also will see Marvin Lewis remain on staff as special assistant to coach Herm Edwards.
Pete Kwiatkowski leaving Washington Huskies to become defensive coordinator for Texas Longhorns, sources say
Pete Kwiatkowski, who has served as defensive coordinator at Washington since 2014, will be hired to the same role at Texas under head coach Steve Sarkisian, sources told ESPN.