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Transgenic Mouse Lines

Transgenic Strategy

The Allen Brain Observatory contains data collected via two-photon calcium imaging to quantify neuron activity in the mouse neocortex in response to visual stimuli. The use of a fluorescent calcium indicator, GCaMP6f, was used to register neural activity in the visual cortex of transgenic mice exposed to various visual stimuli. Calcium influx associated with neural activity results in transient increases in fluorescence of GCaMP6-GFP. These experiments use the transgenic mouse line Ai93, in which GCaMP6f expression is dependent on the activity of both Cre recombinase and the tetracycline-controlled transactivator protein (tTA). Triple transgenic mice (Ai93, tTA, Cre) were generated by first crossing Ai93 mice with Camk2a-tTA mice, which preferentially express tTA in forebrain excitatory neurons. Double transgenic mice were then crossed with a Cre driver line to generate mice in which GCaMP6f expression is induced in the specific populations of neurons that express both Cre and tTA.

Transgenic Mouse Lines

Specific expression is driven by the following Cre driver lines. Clicking on one of the links below will open serial two-photon images of florescent GCaMP6-GFP expression in the triple transgenic mouse line in an image viewer.

In the Transgenic Characterization section of the Allen Brain Observatory, each of the above cell lines is listed with links to view the 2-photon serial tomography as well as a brief description of the brain areas targeted by the transgenic strategy. To view the fluorescence expression in these mouse lines in an image viewer click on either the transgenic mouse line or the example image.

Viewing Fluorescence Images

Transgenic Mouse Detail Page

Clicking on either the trangenic mouse line name or the example image will open a transgenic mouse detail page with metadata on the mouse line including the line name, age, plane of sectioning, organism, sex and induction method.

A panel of images also shows each section (~140 sections) from this series of images. Scrolling down the page will allow you to see images with fluorescence expression.

Image Viewer

For more information, please see the whitepapers in the Documentation tab.

help with using image viewers

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