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Quantitative analysis of NOR expression in a B chromosome of the grasshopper Eyprepocnemis plorans.
Chromosoma. 2009 Jun; 118(3):291-301.C

Abstract

The B24 chromosome in the Torrox population of the grasshopper Eyprepocnemis plorans is recurrently attached to a nucleolus in diplotene cells, indicating the activity of its distally located ribosomal DNA (rDNA). The frequency of males expressing the B chromosome nucleolus organizer region (B-NOR) almost doubled in 4 years. The likelihood of expressing the B-NOR increased with the B number and, in males expressing it, about 20% of their cells showed a nucleolus attached to the B. When active, the B-NOR contributed more than 25% of total cell nucleolar area (NA). Within males expressing the B-NOR, total cell NA did not differ between cells showing the active or inactive B-NOR, suggesting that total cell NA is tightly regulated in this species. However, this parameter tended to increase in this population from 1999 to 2004, in parallel to the neutralization process which is taking place in this population. Finally, an analysis of A chromosome NOR interdependence for activity revealed a positive correlation among autosomes but a negative correlation between autosomes and the X chromosome, the manifestation of which depends on B-NOR activity. These results are discussed in the context of the nucleolus as a sensor of the stress caused by parasitic B chromosomes.

Authors+Show Affiliations

Departamento de Genética, Universidad de Granada, 18071, Granada, Spain.No affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

19048264

Citation

Teruel, María, et al. "Quantitative Analysis of nor Expression in a B Chromosome of the Grasshopper Eyprepocnemis Plorans." Chromosoma, vol. 118, no. 3, 2009, pp. 291-301.
Teruel M, Cabrero J, Perfectti F, et al. Quantitative analysis of NOR expression in a B chromosome of the grasshopper Eyprepocnemis plorans. Chromosoma. 2009;118(3):291-301.
Teruel, M., Cabrero, J., Perfectti, F., & Camacho, J. P. (2009). Quantitative analysis of NOR expression in a B chromosome of the grasshopper Eyprepocnemis plorans. Chromosoma, 118(3), 291-301. https://doi.org/10.1007/s00412-008-0197-x
Teruel M, et al. Quantitative Analysis of nor Expression in a B Chromosome of the Grasshopper Eyprepocnemis Plorans. Chromosoma. 2009;118(3):291-301. PubMed PMID: 19048264.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Quantitative analysis of NOR expression in a B chromosome of the grasshopper Eyprepocnemis plorans. AU - Teruel,María, AU - Cabrero,Josefa, AU - Perfectti,Francisco, AU - Camacho,Juan Pedro M, Y1 - 2008/12/02/ PY - 2008/10/10/received PY - 2008/11/12/accepted PY - 2008/11/06/revised PY - 2008/12/3/pubmed PY - 2009/7/22/medline PY - 2008/12/3/entrez SP - 291 EP - 301 JF - Chromosoma JO - Chromosoma VL - 118 IS - 3 N2 - The B24 chromosome in the Torrox population of the grasshopper Eyprepocnemis plorans is recurrently attached to a nucleolus in diplotene cells, indicating the activity of its distally located ribosomal DNA (rDNA). The frequency of males expressing the B chromosome nucleolus organizer region (B-NOR) almost doubled in 4 years. The likelihood of expressing the B-NOR increased with the B number and, in males expressing it, about 20% of their cells showed a nucleolus attached to the B. When active, the B-NOR contributed more than 25% of total cell nucleolar area (NA). Within males expressing the B-NOR, total cell NA did not differ between cells showing the active or inactive B-NOR, suggesting that total cell NA is tightly regulated in this species. However, this parameter tended to increase in this population from 1999 to 2004, in parallel to the neutralization process which is taking place in this population. Finally, an analysis of A chromosome NOR interdependence for activity revealed a positive correlation among autosomes but a negative correlation between autosomes and the X chromosome, the manifestation of which depends on B-NOR activity. These results are discussed in the context of the nucleolus as a sensor of the stress caused by parasitic B chromosomes. SN - 1432-0886 UR - https://www.unboundmedicine.com/medline/citation/19048264/Quantitative_analysis_of_NOR_expression_in_a_B_chromosome_of_the_grasshopper_Eyprepocnemis_plorans_ L2 - https://dx.doi.org/10.1007/s00412-008-0197-x DB - PRIME DP - Unbound Medicine ER -