Chinese shares edged up on Thursday, with the benchmark Shanghai Composite Index gained 0.22 percent to close at 3,158.86 points. The Shenzhen Component Index edged up 0.01 percent to close at 12,917.15 points. Combined turnover totaled 225.6 billion yuan (33 billion U.S. dollars), down from 326.6 billion yuan on the previous trading day. Gainers outnumbered losers by 557 to 316 in Shanghai and 524 to 296 in Shenzhen. 