Abstract
This review describes image analyses for chromosome visible structures, focusing on the chromosome imaging system CHIAS (Chromosome Image Analyzing System). CHIAS is the first comprehensive imaging system for the analysis and characterization of plant chromosomes. A simulation method for human vision for capturing band positive regions was developed and used for the image analysis of large plant chromosomes with bands. Applying this method to C-banded Crepis chromosomes enabled recognition of band positive regions as seen by human vision. Furthermore, a new image parameter, condensation pattern was developed and successfully applied to identify small plant chromosomes such as rice and brassicas. Condensation profile (CP) derived from condensation pattern was also effective in developing quantitative chromosome maps. The result was quantitative chromosomal maps of several plants with small chromosomes, including Arabidopsis, diploid brassicas, rapeseed, rice, spinach, and sugarcane. In the final chapter, various applications of imaging techniques to the analysis of pachytene chromosomes, improved visibility of multicolor FISH images, 3D reconstruction of a human chromosome based on cross-section images obtained by a FIB/SEM, automatic extraction of chromosomal regions by machine learning, etc. are described.
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Abbreviations
- BAC:
-
bacterial artificial chromosome
- CCD:
-
charge-coupled device
- CEN:
-
centromere
- CHIAS:
-
Chromosome Image Analyzing System
- CP:
-
condensation profile (density profile at the mid-rib of chromatid)
- DAPI:
-
4,6-diamidino-2-phenylindole
- DRWID:
-
drawing idiogram
- EDF:
-
extended DNA fiber
- FIB/SEM:
-
focused ion beam/scanning electron microscope
- FISH:
-
fluorescence in situ hybridization
- Idiogram:
-
quantitative chromosome map
- IRGSP:
-
International Rice Genome Sequencing Project
- LUT:
-
lookup table
- NOR:
-
nucleolar organizing region
- OpenCV:
-
Open Source Computer Vision Library
- PAC:
-
P1-derived artificial chromosome
- PI:
-
propidium iodide
- rDNA:
-
ribosomal DNA
- SDK:
-
software development kit
- Trs-A:
-
tandem repeat sequence
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Acknowledgements
We thank the members of the Chromosome Link for helpful comments and discussion.
Funding
This work was supported by the grant to K.F. from The Japan Science and Technology Agency (JST) (Strategic International Collaborative Research Program JPMJSC17E2).
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KF and SK devised and designed the study. They also performed survey and analysis data. Both authors read and approved the manuscript.
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ESM 1
Suppl. Video1a. Movie for a reconstructed human chromosome based on 224 cross-sectioned images obtained by FIB/SEM (Wako et al. 2020). For the observation of the surface of a human chromosome, the 3D chromosome image can be rotated in any direction. (MP4 1913 kb)
ESM 2
Suppl. Video1b. Movie for the observation of the chromosome interior by virtual cuts of the 3D chromosome image with a plane at any position and any angle. (MP4 597 kb)
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Fukui, K., Kato, S. Imaging approaches for chromosome structures. Chromosome Res 29, 5–17 (2021). https://doi.org/10.1007/s10577-021-09648-3
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DOI: https://doi.org/10.1007/s10577-021-09648-3