A quantitative study of chiasma terminalization in the grasshopper Chorthippus jucundus

Santos, Juan Luis; Ciprés, G.

doi:10.1038/hdy.1989.7

Cited by 5 publications

(3 citation statements)

References 31 publications

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“…4a,d). Due to this characteristic, silver staining has been used to precisely locate and score the number of chiasmata in these highly condensed bivalents (Rufas et al 1987(Rufas et al , 1988, and to support the absence of chiasma terminalization (Santos et al 1989) and the presence of achiasmatic associations (Santos and Esteban 1990).…”

Section: Chromatid Cores In Metaphase I Bivalentsmentioning

confidence: 99%

Chromatid Cores in Meiotic Chromosome Structure and Segregation

Suja

Rufas

Recombination and Meiosis

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There is an extensive literature concerning the structure of mitotic chromosomes and the participation of proteinaceous axial structures, the chromatid cores, in their organization. However, the involvement of the chromatid cores in the structure and segregation of meiotic chromosomes is less known. This chapter reviews the occurrence and behaviour of the chromatid cores in condensed meiotic chromosomes, particularly in grasshopper species. We present current models that relate chromatid cores with the lateral elements of the synaptonemal complex, a tripartite structure present along synapsed homologues during the pachytene stage of prophase I. Additionally, we summarize recent data about the relationship between the chromatid cores, DNA topoisomerase IIα, condensin and cohesin complexes.

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Section: Chromatid Cores In Metaphase I Bivalentsmentioning

confidence: 99%

Chromatid Cores in Meiotic Chromosome Structure and Segregation

Suja

Rufas

Recombination and Meiosis

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“…In some cases, localized chiasmata are related to localized pairing (Oakley & Jones 1982, Stack & Soulliere 1984Croft & Jones 1989). However, most species show only a limited degree of localization in the sense that chiasmata are not restricted to certain regions but occur more frequently in some regions than others (Jones 1987 and references therein; Santos et al 1989). In these cases complete synaptonemal complex formation is always observed.…”

Section: Introductionmentioning

confidence: 97%

Chiasma localization, heterochromatin and synaptonemal complexes in the grasshopperPyrgomorpha conica

1996

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Surface-spread synaptonemal complexes and chiasma distributions in spermatocytes with different C-banding patterns and chiasma distributions in oocytes were analyzed in the grasshopper Pyrgomorpha conica. Male meiosis was characterized by a proximal/distal chiasma localization and complete pairing of homologous chromosomes at pachytene. However, there were indications of a relationship between the frequency and location of pairing initiation sites and chiasma distribution. The presence of a proximal supernumerary segment in a medium-sized chromosome does not increase the mean cell chiasma frequency of carrier individuals compared with those lacking it but may modify chiasma distribution in at least some carrier bivalents. This effect could be related to heterosynapsis in the region near the segment. Mean cell chiasma frequency was significantly lower in females than in males. Females also showed altered chiasma distributions compared with males, with fewer proximal chiasmata and more interstitial and distal chiasmata.

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“…(1986). To ensure comparability, all chiasma scoring was carried out on first metaphase stages in both oocytes and spermatocytes under the assumption that chiasma terminalisation does not exist in these species (Santos et al, 1989).…”

Section: Methodsmentioning

confidence: 99%

Chiasma frequencies and distributions in gomphocerine grasshoppers: a comparative study between sexes

Cano

Santos

1990

Heredity

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Chiasma frequencies and distributions in gomphocerine grasshoppers: a comparative study between sexes Frequency and position of chiasmata at metaphase I were studied in spermatocytes and oocytes from six species of gomphocerine grasshoppers (2nf = 16+ XO; 2n = 16+ XX), namely: Omocestus panteli, Euchorthippus pulvinatus, Euchorthippus chopardi, Chorthippus vagans, Chorthippus parallelus and Chorthippus jucundus. In the latter species mean cell chiasma frequency was similar in both sexes. However in the remainder chiasma frequencies were higher in males than in females. Within each species different bivalents are responsible for the sex chiasma differences that can be interpreted as a relatively simple bivalent based system of chiasma control. Chiasmata were non-localised in both sexes of all species analysed but females showed altered chiasma distributions compared with males, with fewer proximal chiasmata and more interstitial and distal chiasmata.

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A quantitative study of chiasma terminalization in the grasshopper Chorthippus jucundus

Cited by 5 publications

References 31 publications

Chromatid Cores in Meiotic Chromosome Structure and Segregation

Chromatid Cores in Meiotic Chromosome Structure and Segregation

Chiasma localization, heterochromatin and synaptonemal complexes in the grasshopperPyrgomorpha conica

Chiasma frequencies and distributions in gomphocerine grasshoppers: a comparative study between sexes

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