The Qatari index .QSI lost 0.2%, with Commercial Bank COMB.QA trading 1.1% lower. June 22 (Reuters) - Major stock markets in the Gulf fell in early trade on Wednesday, tracking Asian shares as persistent worries about interest rates and inflation remained a key focus for investors. Oil prices, a key catalyst for the Gulf's financial market, skidded more than $6 a barrel amid a push by U.S. President Joe Biden to bring down soaring fuel costs.