HARRISBURG — The redistricting bombshell that the Pennsylvania Supreme Court dropped last month in throwing out legislative district maps developed from the 2010 census could shape state politics for a generation.

The five-member Legislative Reapportionment Commission meets in Harrisburg on Wednesday, its first public get-together since a 4-3 court majority rewrote the rules for drawing the boundaries for 50 Senate and 203 House seats.

There could be a vote on a preliminary replacement plan.

“It doesn’t mean we’re going to,” executive director Charles E. O’Connor Jr. said Thursday. “It depends how the negotiations go. It depends if we’re anywhere near that stage or not. It doesn’t mean if we vote on a possible plan that we pass a plan.”

Republican leaders, with majorities in both chambers, have spoken of a desire to enact new maps quickly, perhaps in time for the April 24 primary, which would be an impressive accomplishment given the powerful and conflicting interests in play.

The commission consists of the House and Senate floor leaders and chairman Stephen J. McEwen Jr., a Republican former Delaware County district attorney and president judge emeritus of the state Superior Court. He was appointed by the Supreme Court after the parties couldn’t agree on the fifth member.

McEwen isn’t talking to reporters, and the other commissioners are either declining comment or saying little.

House Majority Leader Mike Turzai, R-Allegheny, expressed optimism that a plan will be approved Wednesday but would not say how his latest proposal differs from the one the high court rejected.

“We’re in the middle of negotiations, and it’s confidential,” he said.

The plan they produced in December passed 4-1, with the three Republicans joined by House Minority Leader Frank Dermody, R-Allegheny, who supported the deal after getting concessions on districts in the northeast and the Pittsburgh area.

Dermody spokesman Bill Patton said the talks are now “essentially a restart.”

“Many assumptions have changed since this process took place last fall,” Patton said. “In a real sense, we are back at the beginning.”

That means undertaking fresh discussions about which districts to move, whether to put incumbents into districts together and how to take into account several retirements that were announced after the last plan was approved.

The court said the commission improperly split municipalities and that districts should be more compact. Its Jan. 24 decision was issued just as candidates for the Legislature had begun to circulate nominating petitions.

The high court’s order said the 2001 maps would remain in place until the commission comes up with a new plan that passes legal muster.