Chromosomal arrangement of the two main rDNA size classes ofAscaris lumbricoides | Zendy

Eduard Back | Zendy; Fritz Müller | Zendy; Heinz Tobler | Zendy

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Chromosomal arrangement of the two main rDNA size classes ofAscaris lumbricoides

Author(s) -

Eduard Back,

Fritz Müller,

Heinz Tobler

Publication year - 1984

Publication title -

nucleic acids research

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 9.008

H-Index - 537

eISSN - 1362-4954

pISSN - 0305-1048

DOI - 10.1093/nar/12.3.1333

Subject(s) - biology , ascaris lumbricoides , ribosomal dna , genetics , locus (genetics) , ribosomal rna , ascaris , population , metaphase , microbiology and biotechnology , gene , chromosome , zoology , phylogenetics , helminths , demography , sociology

The two main rDNA size classes of 8.8 kb and 8.4 kb length from Ascaris lumbricoides, which comprise more than 95% of the total nuclear rDNA, are arranged as internally homogeneous clusters and are not intermingled with each other. The rRNA genes are present on a single autosomal locus as could be demonstrated by in situ hybridization of fluorochrome-labelled 18S and 26S rRNA to metaphase chromosomes of spermatocytes I. The quantitative ratio of the two rDNA size classes varies largely between individuals being on the average roughly 10:1 in the investigated wild population of A. lumbricoides. However, there are no differences in the hybridization pattern of the two rDNAs in the DNA eliminating nematode A. lumbricoides between germ line and somatic cells in any of the individuals that have been analyzed.

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