NDLI: Divergent location of ribosomal genes in chromosomes of fish thorny-headed worms, Pomphorhynchus laevis and Pomphorhynchus tereticollis (Acanthocephala)

Content Provider	Springer Nature Link
Author	Bombarová, Marta Marec, František Nguyen, Petr Špakulová, Marta
Copyright Year	2006
Abstract	We studied distribution of ribosomal DNA (rDNA) sequences along with chromosomal location of the nucleolar organizer regions (NORs) in males of two fish parasites, Pomphorhynchus laevis and Pomphorhynchus tereticollis (Acanthocephala). Fluorescence in situ hybridization with 18S rDNA probe identified two clusters of rDNA in each species, but revealed a remarkable difference in their location on chromosomes. In P. laevis, the rDNA-FISH signals were found in long arms of the first chromosome pair and in short arms of the second pair. Whereas in P. tereticollis, rDNA clusters were located in long arms of both the first and second chromosome pairs. The divergent location of rDNA clusters in the chromosome No. 2 supports current classification of P. tereticollis, previously considered a synonym of P. laevis, as a separate species. A possible scenario of the second chromosome rearrangement during karyotype evolution of the two species involves two successive pericentric inversions. In both species, one or two prominent nucleoli were apparent within interphase nuclei stained with either silver nitrate or a fluorescent dye YOYO-1. However, a single large nucleolus was observed in early stages of mitosis and meiosis I regardless the number of rDNA clusters. Nevertheless, two bivalents with silver-stained NORs in diakinesis and two silver-stained sites in early prophase II nuclei indicated that all NORs are active. This means that each Pomphorhynchus NOR generates a nucleolus, but the resulting nucleoli have a strong tendency to associate in a large body.
Starting Page	141
Ending Page	149
Page Count	9
File Format	PDF
ISSN	00166707
Journal	Genetica
Volume Number	131
Issue Number	2
e-ISSN	15736857
Language	English
Publisher	Springer Netherlands
Publisher Date	2006-12-02
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Acanthocephala FISH Karyotype evolution Nucleolar organizer region Pomphorhynchus rDNA Syndermata Microbial Genetics and Genomics Human Genetics Plant Genetics & Genomics Animal Genetics and Genomics Life Sciences
Content Type	Text
Resource Type	Article
Subject	Genetics Plant Science Medicine Animal Science and Zoology Insect Science

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