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Conditional Gene Targeting

Tissue Specific Cre Lines

Since 1998, ingenious targeting laboratory has generated and utilized tissue specific Cre driver lines in hundreds of conditional knockout and knockin projects, providing researchers with precise spatial control of gene manipulation in specific cell types and organs.

Tissue specific Cre lines enable gene deletion or activation restricted to defined cell populations, distinguishing cell autonomous from non cell autonomous gene functions.

2,500+
Projects Completed
800+
Publications
26+
Years Experience
100%
Success Rate

Nervous System Cre Drivers

Pan Neuronal

  • Nestin CreNeural progenitors
  • Synapsin CreMature neurons
  • CamKII CreForebrain excitatory neurons

Cell Type Specific

  • POMC CrePOMC neurons
  • AgRP CreAgRP neurons
  • DAT CreDopaminergic neurons
  • PV CrePV+ interneurons

Glial

  • GFAP CreAstrocytes
  • Olig2 CreOligodendrocyte lineage
  • CX3CR1 CreMicroglia

Metabolic and Cardiovascular Cre Drivers

Metabolic Tissues

Albumin CreHepatocytes
Adiponectin CreAdipocytes
Pdx1 CrePancreatic beta cells
Villin CreIntestinal epithelium

Cardiovascular Tissues

Myh6 CreCardiomyocytes
SM22 CreSmooth muscle
Cdh5 CreEndothelial cells
Tie2 CreEndothelium/hematopoietic

Selection Considerations

Specificity

How specific is expression to target cell type? Some drivers have broader expression than expected.

Expression Level

Sufficient Cre expression for complete recombination? Weak drivers may cause mosaic deletion.

Developmental Timing

When does Cre expression begin? Early expression affects all descendants.

Off Target Activity

Does the driver express in unintended tissues? Germline expression causes global recombination.

What Researchers Say

I've been working with iTL over the past 5 years in the production of 3 different genetically altered mice. Not only did iTL help in the design of the mice, but the entire process was transparent with the opportunity at any time along the way to discuss my questions or concerns with scientists who had significant insight into the process. The mice were delivered on time, as billed!

Raghu Mirmira, MD, PhD

University of Chicago

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Our scientific consultants can help you select the optimal Cre driver line or design custom Cre knockin models for your research goals.

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Breeding Scheme Architect

Plan complex multi-allele breeding strategies, calculate expected genotype ratios, and estimate time to experimental cohorts—all before starting your project.

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Calculate Mendelian ratios automatically
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Allele 1Gene-flox (conditional)
Allele 2Cre-driver (tissue-specific)
TargetHomozygous knockout

→ 3 generations to target genotype

Frequently asked questions

Cross the Cre driver to a reporter line (Rosa26 tdTomato or Rosa26 LacZ) before experimental crosses. This visualizes the recombination pattern and confirms expected tissue distribution and timing. Also verify Cre expression by immunohistochemistry and monitor genotyping for unexpected recombination.

Tissue specific Cre drivers provide spatial control (gene deleted in specific organs from development). Inducible Cre drivers (CreERT2) provide temporal control (gene deleted at specific times via tamoxifen). Tissue specific CreERT2 drivers combine both, providing maximum control with spatial and temporal specificity.

Mosaic recombination (incomplete deletion) can result from weak Cre expression, late onset of expression, or inaccessible chromatin at the floxed locus. To improve efficiency, choose stronger Cre drivers, use homozygous floxed alleles, or use inducible systems for more complete activation.

Germline recombination occurs when Cre is active in germ cells, causing global deletion in all offspring. To avoid this, choose Cre drivers without reported germline activity, maintain Cre on one gender only, monitor genotyping for unexpected global deletion patterns.

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