Fluorescence banding in four species of Microtidae: an analysis of the evolutive changes of the constitutive heterochromatin

Burgos, Miguel; Olmos, D. M.; Jiménez, Rafael; Sánchez, Antonio; Guardia, R. Díaz de la

doi:10.1007/bf00055231

Cited by 20 publications

(21 citation statements)

References 19 publications

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“…This idea is supported by the positive silver staining we have shown and the particular requirements for C-banding (Gropp & Natarajan, 1972). This qualitative heterogeneity may imply heterogeneity in the origin of the heterochromatic blocks, so that the situation in hedgehogs may be similar to that described in several species of the genus Microtus: large heterochromatic blocks are present on their sex chromosomes, and different types of heterochromatin have been found with molecular (Modi, 1993a,b) and cytogenetic analyses (Sperling et a!., 1985;Burgos et a!., 1988Burgos et a!., , 1990. Hence, as suggested for Microtus (Burgos et al, 1992) it is possible that some chromosomes in Erinaceus acquired from a common ancestor the ability to accumulate constitutive heterochromatin, rather than the heterochromatin itself.…”

Section: Discussionmentioning

confidence: 63%

Cytogenetic peculiarities in the Algerian hedgehog: silver stains not only NORs but also heterochromatic blocks

et al. 1995

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Hedgehogs belong to one of the several mammalian taxa in which karyotype differences are based on variations in heterochromatin content. Furthermore, the number and location of nucleolar organizer regions (NORs) can also vary widely. In the present study these cytogenetic features were investigated in the Algerian hedgehog, Erinaceus (Aethechinus) algirus. The heterochromatin and NOR distribution patterns in the karyotype of this species are new among hedgehogs, whereas the euchromatic regions, including their G-band pattern, are similar to those reported by others. In addition, silver staining revealed a cytogenetic feature exclusive to the heterochromatic blocks of E. algirus: their silver staining with standard cytogenetic procedures. Because no similar phenomenon has been described previously in a mammalian species, several hypotheses about the significance and specificity of silver staining to NOR sites are discussed. Finally, the existence of different types of heterochromatin in the species analysed here, lead us to propose that what hedgehogs have inherited from their common ancestor is a mechanism which permits the accumulation of heterochromatin on specific chromosomes, rather than the heterochromatin itself.

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Section: Discussionmentioning

confidence: 63%

Cytogenetic peculiarities in the Algerian hedgehog: silver stains not only NORs but also heterochromatic blocks

et al. 1995

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“…Such heterogeneity has been demonstrated in studies of heterochromatin in the sex chromosomes of other rodents (Burgos et al, 1990;Modi 1993;Obara et al, 1997). Furthermore, a possible relationship can be proposed between sex heterochromatin variation and the origin of supernumerary chromosomes.…”

Section: Discussionmentioning

confidence: 88%

Sex-chromosome heterochromatin variation in the wood mouse, <i>Apodemus sylvaticus</i>

Nová

Reutter

Rábová

et al. 2002

Cytogenet Genome Res

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Variation in heterochromatin content, as revealed by G- and C-banding, was studied in the sex chromosomes of the wood mouse, Apodemus sylvaticus. The sex-chromosome heterochromatin was also characterized by DAPI staining. Variation in sex chromatin was recorded in extremely large (giant) sex chromosomes in certain individuals and populations. In some individuals, the Y chromosome was the largest element of the complement. Different variants of both the X and Y chromosomes were found within a single population. The variation is therefore a type of population polymorphism and should not be used for taxonomic discrimination.

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“…In fact, the existence of six different types of heterochromatin has been demonstrated in the sex chromosomes of M. cabrerae, four on the X chromosome and two on the Y chromosome (Burgos et al, 1988c(Burgos et al, , 1990Modi 1993a). Also in this species Burgos et al (1988c) described a length polymorphism due to deletion mutations affecting the heterochromatic block of both X and Y chromosomes.…”

Section: Sex Chromosomesmentioning

confidence: 99%

“…Conventional cytogenetic analysis (C-and G-banding and fluorochrome staining) has demonstrated that the heterochromatin of giant sex chromosomes of Microtus species is highly heterogeneous (Burgos et al, 1988c(Burgos et al, , 1990Modi, 1993a). In fact, the existence of six different types of heterochromatin has been demonstrated in the sex chromosomes of M. cabrerae, four on the X chromosome and two on the Y chromosome (Burgos et al, 1988c(Burgos et al, , 1990Modi 1993a).…”

Section: Sex Chromosomesmentioning

confidence: 99%

Sex chromosomes, sex determination, and sex-linked sequences in Microtidae

Marchal

Acosta

Bullejos

et al. 2003

Cytogenet Genome Res

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The Arvicolidae is a widely distributed rodent group with several interesting characteristics in their sex chromosomes. Here, we summarize the actual knowledge of some of these characteristics. This mammalian group has species with abnormal sex determination systems. In fact, some species present the same karyotype in both males and females, with total absence of a Y chromosome, and hence of SRY and ZFY genes. Other species present fertile, sex-reversed XY females, generally due to mutations affecting X chromosomes. Furthermore, in Microtus oregoni males and females are gonosomic mosaic (the females are XO in the soma and XX in the germ cells, while the males are XY in the soma and OY in the germ cells). Regarding sex chromosomes, some species present enlarged (giant) sex chromosomes because of the presence of large blocks of constitutive heterochromatin, which have been demonstrated to be highly heterogeneous. Furthermore, we also consider the alterations affecting composition and localization of sex-linked genes or repeated sequences. Finally, this rodent group includes species with synaptic and asynaptic sex chromosomes. In fact, several species with asynaptic sex chromosomes have been described. It is interesting to note that within the genus Microtus both types of sex chromosomes are present.

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Fluorescence banding in four species of Microtidae: an analysis of the evolutive changes of the constitutive heterochromatin

Cited by 20 publications

References 19 publications

Cytogenetic peculiarities in the Algerian hedgehog: silver stains not only NORs but also heterochromatic blocks

Cytogenetic peculiarities in the Algerian hedgehog: silver stains not only NORs but also heterochromatic blocks

Sex-chromosome heterochromatin variation in the wood mouse, <i>Apodemus sylvaticus</i>

Sex chromosomes, sex determination, and sex-linked sequences in Microtidae

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