Karyotypvariation und Heterochromatinmuster bei Igeln (Erinaceus und Hemiechinus)

Gropp, A.; Citoler, P; Geisler, M.

doi:10.1007/bf00326166

Cited by 22 publications

(11 citation statements)

References 14 publications

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“…Whether one or the other type is more frequent among Eastern hedgehogs is not known. Studying the late replication pattern, by autoradiography , of Eastern European hedgehogs from eastern Austria, GROPP et al (1969) reported a medium-sized distal block of late replicating chromatin in a chromosome that might well correspond to chromosome No. 15.…”

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confidence: 99%

Variation in C-stained chromosome regions in European hedgehogs (Insectivora, Mammalia)

Mandahl

2009

Hereditas

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European hedgehogs were studied by C‐ and G‐banding techniques. Animals were sampled from several localities in Europe, but mainly from the Scandinavian countries. The interest was focused on the presence or absence of large autosomal C‐blocks in individual chromosome pairs, and on the incidence of C‐band variants. With respect to number and distribution of such blooks five different karyotypes could be distinguished in the material, three belonging to the Western hedgehogs and two to the Eastern ones. These dissimilarities were the most significative differences between karyotypes. The geographical distribution of the five karyotypes is discussed with reference to existing subspecies recognition. The large distal C‐blocks appearing in 2–4 chromosome pairs were highly polymorphic in size, reflected in a high frequency of heteromorphic pairs. An attempt was made to shed some light on the problem of a continuous or discontinuous type of variation of the C‐blocks and, therefore, a statistical method was applied to quantitative data. Only one sample of 22 animals from southern Sweden was regarded as informative, indicating that the size variation of the C‐blocks in one chromosome pair was bi‐ or trimodal, and thus discontinuous. Contrarily, the size distribution of the C‐blocks in the other two pairs seemed to be continuous, although their mode of variation differed slightly.

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Variation in C-stained chromosome regions in European hedgehogs (Insectivora, Mammalia)

Mandahl

2009

Hereditas

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“…1967;G ropp et al, 1969), the Western European hedgehog, E. europaeus, possesses 48 chromosomes, with 2 pairs of large subacrocentrics, 18 pairs of metaand submetacentrics of decreasing size, 1 pair of medium-sized acrocentrics, 2 pairs of metacentric microchromosomes, and the sex chromo somes. The X chromosome is of the standard type.…”

Section: Resultsmentioning

confidence: 99%

Timing of DNA replication of autosomal heterochromatin in the hedgehog

Citoler

Gropp

Natarajan

1972

Cytogenet Genome Res

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The time sequence of DNA synthesis of autosomal constitutive heterochromatin and euchromatin was studied in kidney-cell cultures of the European hedgehog which had been pulse labeled with ³H-thymidine. The mean length of the S-period is 10.4 h for euchromatin and 5.2 h for constitutive heterochromatin. Thus the latter replicates DNA twice as fast as euchromatin. Constitutive heterochromatin starts replicating DNA about 7 h later and finishes 1.5 h later than euchromatin. The asynchrony of DNA synthesis between the two types of chromatin is particularly marked in the beginning of the S-phase. The inactive X chromosome also synthesizes DNA faster than euchromatin; it begins a short time before and finishes slightly after constitutive heterochromatin. The finding of accelerated DNA synthesis in autosomal heterochromatin lends itself to several possible explanations, although it remains difficult to understand fully at present.

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“…In other organisms, such as the mouse, for example, nonhomologous as sociations have been reported between centric heterochromatin (Hsu et al" 1971). and in the Algerian hedgehog, Aethechinus algirus, where two submetacentric chromosomes show large, distal heterochromatic blocks (Gropp et al" 1969;Gropp and Natarajan, 1972), these regions have been found to associate with nucleoli (Natarajan and Gropp, 1971). In man, the heterochromatic secondary con striction region of chromosome 9 has been found to associate with nucleoli in meiotic prophase (Page, 1973), and a similar association has been observed for the long-arm distal heterochromatic region of the human Y chromosome (Bobrow et al, 1971).…”

Section: Discussionmentioning

confidence: 99%

“…The terminal heterochromatic regions in two st f>-metacentric chromosomes in the Algerian hedgeh g correspond to euchromatic regions in the Asi n hedgehog, Hemiechinus megalotis (Gropp et al, 1969;Gropp and Natarajan, 1971;Natarajan and Gro| p, 1971). A comparison of these two bivalents (see M .-los and John, 1976, and fig.…”

Section: Discussionmentioning

confidence: 99%

The meiotic chromosomes of <i>Cebus apella</i> (Cebidae, Platyrrhini)

Seuánez

Armada

Barroso

et al. 1983

Cytogenet Genome Res

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An analysis of the meiotic chromosomes of Cebus apella (Cebidae, Platyrrhini) has allowed for the visualization of constitutive heterochromatic regions throughout the meiotic cycle and has permitted the identification of four chromosomes in the first and the second divisions. In pachytene nuclei, and in pachytene spreads where synaptonemal complexes were visible, one heterochromatic region was frequently unpaired. No chiasmata were found in heterochromatic regions, and there was no evidence of chiasma terminalization. The role of heterochromatin in homologous pairing and its relationship to chiasma position and number in meiotic configurations were discussed. A comparison was made between bivalent 9 in C. apella and bivalent 21 in man, based on the interspecific homologies between these chromosomes. A similar comparison was made between the Algerian and Asian hedgehogs, where marked differences in the content of constitutive heterochromatin occur in two chromosome pairs.

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Karyotypvariation und Heterochromatinmuster bei Igeln (Erinaceus und Hemiechinus)

Cited by 22 publications

References 14 publications

Variation in C-stained chromosome regions in European hedgehogs (Insectivora, Mammalia)

Variation in C-stained chromosome regions in European hedgehogs (Insectivora, Mammalia)

Timing of DNA replication of autosomal heterochromatin in the hedgehog

The meiotic chromosomes of <i>Cebus apella</i> (Cebidae, Platyrrhini)

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