acta2-GCaMP8.1-mVermilion Strain Information Sheet

Strain Name:

Common Name: acta2-GCaMP8.1-mVermilion

CHROMusTM designation and lines available: R24:B34 Line 4

Jackson Stock number: Jax# 032887

Development: The GCaMP8.1-mVermilion fusion protein was inserted at the ATG site of the acta2 gene in the BAC RP23-370F21 (CHORI) through homologous recombination. The resulting recombinant BAC was injected into the male pronucleus of fertilized oocytes which were then implanted into pseudo pregnant females. Resulting offspring were screened for the presence of the transgene (founders). Colonies were established from each founder and tested for expression.

Transgenic Numbers:

# pups born # founders # expressers
20 4 1

Description: The genetically encoded calcium indicator GCaMP8.1-mVermilion is expressed under control of the acta2 promoter, directing expression to smooth muscle cells in various organ systems including blood vessels, airways of the lung, gut, bladder. Expression may be present in other smooth muscle containing tissues which have not been examined.  GCaMP8.1 is modified from GCaMP8 and includes codon optimization for mouse and one mutation M144I in the calmodulin portion of the protein resulting in a lower kD.  mVermilion is an mCherry derivative with approximately a 2 fold brighter emission.  GCaMP8.1 responds to calcium levels in the cell. When calcium increases, a conformation change occurs resulting in an increase in fluorescence. When calcium decreases, fluorescence decreases.  mVermilion remains at a constant level, allowing for ratiometric measurements of calcium signaling in various smooth muscle containnig organ systems.

Phenotypic Data:

acta2-GCaMP8.1-mVermilion expression in vessels in brain, heart and spleen.

acta2-GCaMP8.1-mVermilion expression in vessels in brain, heart and spleen.

Genotyping Protocol:

Expected size of product: 456bp
Cycling conditions:

  1. 94oC 3 minutes
  2. Repeat 30 times
    1. 30 sec @ 94oC
    2. 30 sec @ 57oC
    3. 60 sec @ 72oC
  3. 72oC 5 minutes
  4. 10oC hold

PCR results:

GCaMP8.1 PCR result

Terms of Use: Please contact chromus@cornell.edu for information on MTA and fees.

So as to appropriately acknowledge and credit the scientists who have produced the acta2-GCaMP8.1-mVermilion mouse strain, it is expected that you will include these individuals in any publication that is submitted prior to the initial publication of this line from the Kotlikoff laboratory.

Acknowledgement: Please inform us of any publications resulting from the use of this mouse and use the following statement to acknowledge their development:

The mouse strain acta2-GCaMP8.1-mVermilion was developed by CHROMusTM which is supported by the National Heart Lung Blood Institute of the National Institute of Health under award number R24HL120847.


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