Abstract：
:The quality of genetically encoded calcium indicators (GECIs) has improved dramatically in recent years, but high-performing ratiometric indicators are still rare. Here we describe a series of fluorescence resonance energy transfer (FRET)-based calcium biosensors with a reduced number of calcium binding sites per sensor. These 'Twitch' sensors are based on the C-terminal domain of Opsanus troponin C. Their FRET responses were optimized by a large-scale functional screen in bacterial colonies, refined by a secondary screen in rat hippocampal neuron cultures. We tested the in vivo performance of the most sensitive variants in the brain and lymph nodes of mice. The sensitivity of the Twitch sensors matched that of synthetic calcium dyes and allowed visualization of tonic action potential firing in neurons and high resolution functional tracking of T lymphocytes. Given their ratiometric readout, their brightness, large dynamic range and linear response properties, Twitch sensors represent versatile tools for neuroscience and immunology.
journal_name
Nat Methodsjournal_title
Nature methodsauthors
Thestrup T,Litzlbauer J,Bartholomäus I,Mues M,Russo L,Dana H,Kovalchuk Y,Liang Y,Kalamakis G,Laukat Y,Becker S,Witte G,Geiger A,Allen T,Rome LC,Chen TW,Kim DS,Garaschuk O,Griesinger C,Griesbeck Odoi
10.1038/nmeth.2773subject
Has Abstractpub_date
2014-02-01 00:00:00pages
175-82issue
2eissn
1548-7091issn
1548-7105pii
nmeth.2773journal_volume
11pub_type
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