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Exploring Pax6 Gene Expression in Developing Cortex Through Genetic Manipulation

This study delves into the impact of Pax6 gene deletion in the developing cortex and identifies rapid gene expression changes. Researchers use conditional Pax6 KO models and deep sequencing analysis at various embryonic stages post-tamoxifen induction. Collaboration with Pathway Medicine and Genepool enhances understanding. No significant changes in Smad4, Cdk4, cyclin D2, MCM3, and MCM6 expression. Results contribute to elucidating Pax6's role in cortical development.

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Exploring Pax6 Gene Expression in Developing Cortex Through Genetic Manipulation

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  1. 10,000,000,000 cells 7,000,000,000 people

  2. 1984 Conservation of developmental mechanisms

  3. Transcription factors Downstream effectors

  4. Pax6 5’UTR Paired linker Homeo PST 3’UTR domain domain transactivation domain Alternatively spliced exon 5a

  5. Pax6 Paired domain Homeo domain

  6. Mutant Control Mutant Mutant Sisodya et al Nature Genetics 2001

  7. Pax6 gene expression in the developing cortex Caudal Medial Rostral Lateral

  8. Wild-type Mutant

  9. Pax6 expression reporter FACS sorted Pax6-expressing cells

  10. Controls Pax6-/- control -/- +/+ No -/- +/+ Collaboration with Pathway Medicine Mutant -/- +/+

  11. Mi et al 2013 Neuron

  12. Martine Manuel Mike Molinek Da Mi John Mason New Study Delete Pax6 specifically in the cortex at a chosen time Look for changes in gene expression that occur rapidly after loss of Pax6 Primary defects Direct targets

  13. Pax6flox allele Ian Simpson Conditional EGFP reporter loxP loxP Stop EGFP Cre EGFP

  14. Emx1-CreERT2 CreERT2 OFF CreER Tamoxifen CreER ON

  15. Give tamoxifen to pregnant females at E9.5 Collect embryos at E11.5, E12.5 and E13.5 Pax6+/flox Emx1creER Pax6flox/flox Emx1creER control Pax6 cKO Dissect cortex Dissect cortex Extract RNA Extract RNA Deep Sequencing Deep Sequencing

  16. Tamoxifen given at E9.5 E11.5 E12.5 E13.5

  17. E12.5 GFP / Pax6 immuno control Pax6 cKO control Pax6 cKO

  18. E12.5 control Pax6 cKO

  19. E12.5 control1 Pax6cKO1 control2 Pax6cKO2 C R C R C R C R Pax6 bactin

  20. Tamoxifen given at E9.5 E9.5 E11.5 E12.5 E13.5

  21. Tamoxifen given at E9.5 * * E11.5 E12.5 E13.5 E11.5 E12.5 E13.5 E9.5 * E11.5 E12.5 E13.5 E9.5 E11.5 E12.5 E13.5

  22. Tamoxifen given at E9.5 * E11.5 E12.5 E13.5 E9.5 E11.5 E12.5 E13.5 E9.5 * E11.5 E12.5 E13.5 E9.5

  23. Tamoxifen given at E9.5 E9.5 E11.5 E12.5 E13.5 E9.5 E11.5 E12.5 E13.5 Also no significant change in Smad4, Cdk4, cyclin D2, MCM3 and MCM6 expression.

  24. Tamoxifen given at E9.5 R CeM CeL C Caudal Rostral E12.5

  25. Collection of samples for RNAseq Rostral cortex Caudal cortex Pax6 immuno RNA extraction

  26. controls Pax6 cKO Collaboration with Genepool Control Pax6cKO Control Pax6cKO Control Pax6cKO

  27. E13.5 control Pax6 cKO

  28. Pax6 immuno. E13.5. Sagittal. Rostral Rostral Control Pax6 cKO

  29. E13.5 control Pax6cKO C R C R Pax6 bactin

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