Mouse alpha-calcium/calmodulin-dependent protein kinase II (CaMKIIα) promoter (8.5 kb)

Full-length genomic fragment of the mouse Camk2a gene promoter, comprising 8.5 kb of upstream sequence plus the 5' noncoding exon, that restricts transgene expression to excitatory forebrain neurons. Used to generate germline transgenic mouse lines, including tetracycline-regulated (tet-Off) systems, with expression confined to cortex, hippocampus, and striatum.

Length: 8023 bp

Strength: strong

Tissue: Excitatory neurons of adult forebrain — cortex, hippocampus, and striatum; minimal expression in cerebellum or non-neuronal tissue

Expression: constitutive

Origin: Mouse Camk2a gene, 8.5 kb genomic promoter fragment

Characteristics

Spans 8.5 kb of genomic sequence upstream of the Camk2a transcription start site plus 84 bp of the 5' noncoding exon (Mayford et al. 1996). Combined with the tetracycline transactivator (tTA), drives forebrain-restricted, adult transgene expression in cortex, hippocampus, and striatum. In a related construct using the same regulatory region, transcript reached 10-21% of endogenous CaMKIIα mRNA levels and was detected throughout hippocampal dendritic layers (Mayford et al. 1995).

Applications: Used to generate germline transgenic and tet-Off (tTA-regulated) mouse lines that restrict constitutively active or dominant-negative transgenes to excitatory forebrain neurons, including CaMKII autophosphorylation-mimetic mutants used to study synaptic plasticity, LTP/LTD, and spatial memory in cortex, hippocampus, and striatum.

Limitations: At 8.5 kb, the fragment exceeds AAV and lentiviral packaging capacity once combined with a transgene and polyA signal, restricting practical use to pronuclear-injection transgenic mouse lines rather than viral vectors; the compact 1.3 kb camk2a-short fragment is used instead for AAV/lentiviral delivery. Relative activity compared to shorter Camk2a promoter fragments has not been directly measured for this construct.

Sequence

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References

  1. Mayford et al. (1995). CaMKII regulates the frequency-response function of hippocampal synapses for the production of both LTD and LTP. Cell - Mayford 1995 CaMKII Frequency