** Shares of gene-sequencing equipment maker Illumina ILMN.O fall 2.7% to $94.6
** Bernstein analysts say Roche's ROG.S new gene sequencing device designed to decode diseases such as cancer, immune disorders and neurodegenerative diseases outperforms ILMN's devices
** ROG unveiled the device on Thursday, featuring gene sequencing capabilities that provides detailed insights into genetics, genomics and cell biology
** ILMN shares had closed down 5.6% on Thursday, following the news
** Bernstein raises questions about the accuracy of the ROG device but said it could be a serious threat to ILMN in some applications
** ILMN has fallen 24.8% in the past 12 months
(Reporting by Padmanabhan Ananthan)
((Padmanabhan.Ananthan@thomsonreuters.com;))