LONDON, April 6 : Oil prices inched up in choppy trade on Monday, as investors awaited clarity on the status of talks between the U.S. and Iran and remained wary about sustained supply losses due to shipping disruptions. Brent crude futures were up 0.1 per cent to $109.13 a barrel at 1326 GMT. U.S. West Texas Intermediate crude futures were trading up 0.69 per cent, or 77 cents, at $112.31 per barrel. The pricing moves in Asia trading on Monday were dwarfed by an 11 per cent surge for WTI and