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DTSTART:19960101T000000 END:STANDARD BEGIN:STANDARD TZNAME:GMT TZOFFSETFROM:+0100 TZOFFSETTO:+0000 DTSTART:19961027T020000 RRULE:FREQ=YEARLY;BYMONTH=10;BYDAY=-1SU END:STANDARD END:VTIMEZONE BEGIN:VEVENT DTSTAMP:20260626T071454Z DTSTART;VALUE=DATE-TIME:20100127T130000 DTEND;VALUE=DATE-TIME:20100127T140000 SUMMARY:Complexity Forum - Sarah Teichmann TZID:Europe/London UID:20100127-094d43d5385c299a01386c3bd8b16d62@warwick.ac.uk CREATED:20100110T220715Z DESCRIPTION:Speaker: Sarah Teichmann (Cambridge) Title: A genomic and qua ntitative view of gene expression levels and epigenetic modifications Ab stract: Gene expression levels are believed to be continuously distribut ed from very low to very high levels\, with most genes at an intermediat e level. We studied the transcriptome-wide distribution of expression le vels in T helper cells based on microarray and RNA-seq technology and in tegrated this with RNA-fish experiments for well-characterized genes\, a llowing the quantification of mRNA transcripts at single-molecule resolu tion. The results of these analyses and experiments show that virtually all genes are expressed at > ~ 1 molecule per cell and that two major ex pression levels can be identified which vary by roughly one to two order s of magnitude\, giving rise to strongly bimodal expression distribution s. Analysis of histone modifications by ChIP-seq indicates that activati ng modifications such as H3K9/14ac and H3K4me3 are involved in this ‘dig ital’ expression switch. Our findings have broad implications for the an alysis of microarray\, RNA-seq and ChIP-seq data and for the understandi ng of the regulation of gene expression. LOCATION: CATEGORIES:Seminar Room D1.07,forum LAST-MODIFIED:20120709T145408Z ORGANIZER;CN=Colm Connaughton: END:VEVENT END:VCALENDAR