Chromosomal mapping of 5S and 18S-5.8S-25S rRNA genes in <italic style="font-style: italic">Saccharina japonica</italic> (Phaeophyceae) as visualized by dual-color fluorescence in situ hybridization

Yu LIU; Pengfei LIU; Yanhui BI; Zhigang ZHOU

doi:10.1007/s00343-020-9276-5

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Chromosomal mapping of 5S and 18S-5.8S-25S rRNA genes in Saccharina japonica (Phaeophyceae) as visualized by dual-color fluorescence in situ hybridization

Biology | Updated：2023-06-06

- Chromosomal mapping of 5S and 18S-5.8S-25S rRNA genes in Saccharina japonica (Phaeophyceae) as visualized by dual-color fluorescence in situ hybridization
- Journal of Oceanology and Limnology Vol. 39, Issue 2, Pages: 714-720(2021)
- Affiliations：
  
  1.Key Laboratory of Exploration and Utilization of Aquatic Genetic Resources Conferred by Ministry of Education, Shanghai Ocean University, Shanghai 201306, China
  2.National Demonstration Center for the Experimental Teaching of Fisheries Science, Shanghai Ocean University, Shanghai 201306, China
  3.International Research Center for Marine Biosciences Conferred by Ministry of Science and Technology, Shanghai Ocean University, Shanghai 201306, China
- Author bio：
  
  Zhigang ZHOU, E-mail: zgzhou@shou.edu.cn
- Funds：
- DOI：10.1007/s00343-020-9276-5
  CLC：
- Received：19 October 2019，
  
  Accepted：24 February 2020，
  
  Online First：12 May 2021，
  
  Published：2021-03
- Accepted：
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Yu LIU, Pengfei LIU, Yanhui BI, et al. Chromosomal mapping of 5S and 18S-5.8S-25S rRNA genes in Saccharina japonica (Phaeophyceae) as visualized by dual-color fluorescence in situ hybridization[J]. Journal of Oceanology and Limnology, 2021, 39(2): 714-720.
DOI：

Yu LIU, Pengfei LIU, Yanhui BI, et al. Chromosomal mapping of 5S and 18S-5.8S-25S rRNA genes in Saccharina japonica (Phaeophyceae) as visualized by dual-color fluorescence in situ hybridization[J]. Journal of Oceanology and Limnology, 2021, 39(2): 714-720. DOI： 10.1007/s00343-020-9276-5.

摘要

Abstract

It has been reported that there was a linkage of 5S rRNA gene to 18S-5.8S-25S rRNA gene in a few of species in Ochrophyta. In regard to the usual two positions of linked 5S rDNA to the 3' end of 25S rDNA

two pairs of primers were designed for amplification to verify this linkage of two genes in a kelp cultivar of

Saccharina japonica

one of species in Ochrophyta. This result supplemented the previous report that 5S rDNA was unlinked to 25S rDNA in this kelp. In order to simultaneously visualize this unlinkage of two genes

dual-color fluorescence in situ hybridization (FISH) technique was applied to the cytogenetics of

S. japonica

. Dual-color FISH images showed that two and four hybridization signals were present in the kelp gametophyte and sporophyte

respectively

metaphase nuclei hybridized simultaneously with the labeled probes of 18S rDNA and 5S rDNA. Both haploid and diploid karyotypes in decreasing length of chromosomes showed that 18S-5.8S-25S rDNA was localized at the interstitial region of Chromosome 23

whereas 5S rDNA resided at the sub-telomeric region of Chromosome 27. These karyotypes suggested that the kelp nuclear genome had only one locus of each rRNA gene

and their loci on different chromosomes indicated the physical unlinkage of 5S rDNA to 18S-5.8S-25S rDNA in this kelp. Therefore

dual-color FISH seems to be a powerful technique for the discrimination and pairing of chromosomes featured in both small size and nearly identical shape in

S. japonica

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references

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Chromosomal mapping of 5S and 18S-5.8S-25S rRNA genes in Saccharina japonica (Phaeophyceae) as visualized by dual-color fluorescence in situ hybridization

DOI：10.1007/s00343-020-9276-5

摘要

Abstract

关键词

Keywords

references