China"s shares ended lower on Tuesday, as losses in materials, financials and consumer discretionary firms weighed on broader indexes amid concerns over the impact of the Omicron COVID-19 variant and debt risks facing property developers. ** At the close, the Shanghai Composite index (.SSEC) was down 0.53% at 3,661.53. ** The blue-chip CSI300 index (.CSI300) was down 0.67%, with its financial sector sub-index (.CSI300FS) losing 1.17%, the resources sector (.CSI000944) falling 2.3%, the real-estate index (.CSI000952) down 2.47% and consumer discretionary firms (.CSI000911) ending 2% lower. ** The real-estate index (.CSI000952) fell as concerns around debt risks saw bonds issued by Shanghai Shimao Co Ltd (600823.SS) suspended from trade on the Shanghai Stock Exchange. ** China securities regulator said on Monday it would properly resolve bond default risks and crack down on "fake financial exchanges" after holding a meeting to discuss instructions from last week"s Central Economic Work Conference. ** Also hitting sentiment, several companies in one of China"s biggest manufacturing hubs suspended operations amid attempts to contain a COVID-19 outbreak. read more ** The smaller Shenzhen index (.SZSC) ended down 0.27% and the start-up board ChiNext Composite index (.CNT) was weaker by 0.054%. ** Tech shares came under pressure after China"s cyberspace regulator said on Monday it had fined Weibo , the operator of social media platform Sina, 3 million yuan ($470,000) for what it said was repeated publishing and transmission of illegal information. read more ** Around the region, MSCI"s Asia ex-Japan stock index (.MIAPJ0000PUS) was weaker by 0.74%, while Japan"s Nikkei index (.N225) closed 0.73% lower. ** At 0700 GMT, the yuan was quoted at 6.3626 per U.S. dollar, 0.08% firmer than the previous close of 6.368. ** So far this year, the Shanghai stock index is up 5.4% and the CSI300 has fallen 3.1%, while China"s H-share index listed in Hong Kong is down 21.7%. Shanghai stocks have risen 2.74% this month. Reporting by Shanghai Newsroom; Editing by Sherry Jacob-Phillips Our Standards: The Thomson Reuters Trust Principles.