** Gene sequencing equipment maker Illumina's ILMN.O shares fall 2.62% to $82 premarket
** China bans ILMN's gene sequencers, just minutes after U.S. President Donald Trump's additional 10% tariff took effect
** Beijing had put Illumina on its "unreliable entity" list in February
** Sales in China account for about 7% of the company's revenue
** Stock has fallen 37% in the past 12 months
(Reporting by Padmanabhan Ananthan)
((Padmanabhan.Ananthan@thomsonreuters.com;))