Abstract
Results indicate high variability of the number of NORs active in both populations. Comparison between populations reveals differences both in the number of the more frequently observed active NORs and in the maximum number of active NORs. Ag-NORs present on Rb metacentric chromosomes are found to be less active than those carried on acrocentrics. It is postulated that centric fusions play a negative role with regard to NOR activity or to the characteristics enabling NORs to be observed.
Riassunto
Variabilità delle Regioni Nucleolo Organizzatrici attive in due popolazioni di Mus musculus domesticus (Rodentia, Muridae). È stata studiata la variabilità degli Ag-NOR in due popolazioni di Mus musculus domesticus a différente numéro cromosomico a causa di fusioni Rb. I risultati ottenuti evidenziano una ampia variabilità nel numéro dei NOR attivi in ambedue le popolazioni. Il confronto tra le due popolazioni mette in risalto differenze sia nel numéro di NOR attivi più frequentemente osservati sia nel numero massimo di NOR attivi; si è osservata inoltre una minore attività degli Ag-NOR presenti sui cromosomi metacentrici rispetto a quelli presenti sugli acrocentrici. È stata avanzata l’ipotesi che le fusioni centriche giochino un ruolo negativo riguardo all’attività dei NOR o a quelle caratteristiche che li rendono evidenziabili.
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Pervenuta all’Accademia il 25 luglio 1990.
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Civitelli, M.V., Montalto, R.C., Caldarini, G. et al. Variability of nucleolus organizer regions active in two Mus musculus domesticus populations (Rodentia, Muridae). Rend. Fis. Acc. Lincei 2, 69–78 (1991). https://doi.org/10.1007/BF03010414
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DOI: https://doi.org/10.1007/BF03010414