TOKYO, Jan 22 (Reuters) – Japanese shares edged up on Thursday as the yen sagged versus the dollar after surging the previous day, although caution ahead of the closely-watched European Central Bank policy meeting firmly later in the day capped gains.

Upcoming domestic corporate earnings announcements also added to the wait-and-see mood.

The Nikkei ended 0.3 percent higher at 17,329.02. The broader Topix slipped 0.1 percent to 1,389.43 and the JPX-Nikkei Index 400 shed 0.1 percent to 12,631.01.

(Reporting by Shinichi Saoshiro; Editing by Eric Meijer)