TOKYO, Dec 23 (Reuters) - Japanese government bond futures edged higher on Wednesday, supported by uncertainty over a new coronavirus variant and U.S. President Donald Trump’s threat to not sign a stimulus bill. Overall, moves in the cash market were subdued as many traders avoided taking out big positions before year-end holidays. Benchmark 10-year JGB futures rose 0.01 point to 152.14, with a trading volume of 14,811 lots. The 10-year JGB yield was flat at 0.005%. The 20-year JGB yield fell 0.5 basis point to 0.375%. The 30-year JGB yield fell 1 basis point to 0.615%. The 40-year JGB yield was unchanged at 0.675%. The five-year yield was flat at minus 0.125%. At the short end, the two-year JGB yield held steady at minus 0.140%. (Reporting by the Tokyo markets team; Editing by Aditya Soni)