Australian shares have edged up 0.2 per cent, or 12.3 points, to 7399.4, in early trade, led by increases in the materials and utilities sectors.IGO shares jumped 4.2 per cent to $13.770, followed by Incitec Pivot up 2.7 per cent to $3.9. Clinuvel Pharmaceuticals was the largest laggard, retreating 1.9 per cent to $18.71.Premier Investments dipped 1.3 per cent after posting its half-year results. All major banks rose, while mining giants were mixed. Lower oil prices weighed on energy stocks with