Corn snake (Pantherophis guttatus)

The corn snake is named for the species' regular presence near grain stores, where it preys on mice and rats that eat harvested corn. Corn snakes are important for curbing local rodent populations! Read more about corn snakes on Wikipedia.

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Corn snake couple (Pantherophis guttatus), photo by Tanya Orsini [Public domain], via flickr.com

Chromosome-length genome assembly

Download the UNIGE_PanGut_3.0_HiC.fasta.gz file containing the chromosome-length (2n=36) assembly of the corn snake genome. All modifications with respect to the draft (see below) are annotated in the UNIGE_PanGut_3.0_HiC.assembly file. Some basic stats associated with the new reference, UNIGE_PanGut_3.0_HiC, are listed below. The full data release can be explored here.

Contig length (bp)
Number of contigs
Contig N50 (bp)
Longest contig (bp)
1,626,744,210
119,289
37,937
466,174
Scaffold length (bp)
Number of scaffolds
Scaffold N50 (bp)
Longest scaffold (bp)
1,689,041,638
33,440
147,593,717
335,604,538
Draft

The chromosome-length genome assembly is based on the draft assembly UNIGE_PanGut_3.0 (GCA_001185365.2), credited below.

Ullate-Agote, A., Burgelin, I., Debry, A., Langrez, C., Montange, F., Peraldi, R., Daraspe, J., Kaessmann, H., Milinkovitch, M.C., Tzika, A.C., 2020. Genome mapping of a LYST mutation in corn snakes indicates that vertebrate chromatophore vesicles are lysosome-related organelles. Proc. Natl. Acad. Sci. 117, 26307-26317. https://doi.org/10.1073/pnas.2003724117.

Method

3D Assembly was performed using 3D-DNA pipeline (Dudchenko et al., Science, 2017). The genome was reviewed using Juicebox Assembly Tools  (Dudchenko et al., bioRxiv, 2018). See Methods for more information.

Hi-C sample

The blood sample for in situ Hi-C preparation was donated by a male individual, and provided to us by Shedd Aquarium.

Hi-C Contact maps

Hi-C data was aligned to the draft reference using Juicer (Durand, Shamim et al., Cell Systems, 2016), and contact maps visualizing the alignments with respect to the draft and the new reference were built using 3D-DNA (Dudchenko et al., Science, 2017). The contact maps can be explored below via Juicebox.js interactive tool (Robinson et al., Cell Systems, 2018). To explore the assembly in greater detail, please download the .hic and .assembly files from the data release folder and use Juicebox Assembly Tools  (Dudchenko et al., bioRxiv, 2018).

References

If you use this genome assembly in your research, please check that the conditions of use associated with the draft permit it, and acknowledge the following work.

Ullate-Agote, A., Burgelin, I., Debry, A., Langrez, C., Montange, F., Peraldi, R., Daraspe, J., Kaessmann, H., Milinkovitch, M.C., Tzika, A.C., 2020. Genome mapping of a LYST mutation in corn snakes indicates that vertebrate chromatophore vesicles are lysosome-related organelles. Proc. Natl. Acad. Sci. 117, 26307-26317. https://doi.org/10.1073/pnas.2003724117.

Dudchenko, O., Batra, S.S., Omer, A.D., Nyquist, S.K., Hoeger, M., Durand, N.C., Shamim, M.S., Machol, I., Lander, E.S., Aiden, A.P., Aiden, E.L., 2017. De novo assembly of the Aedes aegypti genome using Hi-C yields chromosome-length scaffolds. Science 356, 92–95. https://doi.org/10.1126/science.aal3327.

Dudchenko, O., Shamim, M.S., Batra, S., Durand, N.C., Musial, N.T., Mostofa, R., Pham, M., Hilaire, B.G.S., Yao, W., Stamenova, E., Hoeger, M., Nyquist, S.K., Korchina, V., Pletch, K., Flanagan, J.P., Tomaszewicz, A., McAloose, D., Estrada, C.P., Novak, B.J., Omer, A.D., Aiden, E.L., 2018. The Juicebox Assembly Tools module facilitates de novo assembly of mammalian genomes with chromosome-length scaffolds for under $1000. bioRxiv 254797. https://doi.org/10.1101/254797.

Disclaimer

This is a work in progress. If you notice any discrepancies in the map or have data that confirms or contradicts the suggested reference, please email us at thednazoo@gmail.com or leave a comment on the Forum.