By Lisa Pauline Mattackal and Purvi Agarwal (Reuters) -Futures tied to the S&P 500 and the Nasdaq pointed to a lower open on Tuesday, while Dow futures ticked higher, as investors assessed a slew of corporate earnings and awaited economic data for more clarity on the impact of U.

U.S. stock index futures showed minimal movement as investors prepared for a week of key economic data and major earnings announcements. The focus remains on U.S. trade policy developments amid mixed negotiations signals between the U.