The synaptonemal complexes of Caenorhabditis elegans: Pachytene karyotype analysis of the Dp 1 mutant and Disjunction Regulator Regions

Chromosoma ◽  
1985 ◽  
Vol 93 (2) ◽  
pp. 177-182 ◽  
Author(s):  
Paul Goldstein
Keyword(s):  
Caenorhabditis Elegans ◽  
Karyotype Analysis ◽  
Synaptonemal Complexes ◽  
Pachytene Karyotype

Triplo-X hermaphrodite of Caenorhabditis elegans: pachytene karyotype analysis, synaptonemal complexes, and pairing mechanisms

1984 ◽  
Vol 26 (1) ◽  
pp. 13-17 ◽  
Author(s):  
Paul Goldstein
Keyword(s):  
Caenorhabditis Elegans ◽  
Karyotype Analysis ◽  
Real Difference ◽  
X Chromosomes ◽  
Synaptonemal Complexes ◽  
Chromosomal Complement ◽  
Male Line ◽  
Pachytene Karyotype

Pairing of the three X chromosomes in the triplo-X strain of Caenorhabditis elegans occurs at pachytene in a two-by-two fashion such that one bivalent and one univalent are formed. The XX bivalent pairs synchronously with the autosomes and the univalent X remains in a similar chromatic state as the rest of the chromosomal complement. Normal tripartite synaptonemal complexes (SC) are formed between all bivalents. The univalent X lacks a SC and an axial core is not observed. The condensation of the univalent X in the triplo-X is different than in the male where the univalent X is heterochromatic. This real difference in condensation states of the chromatin may explain the fact that the univalent X is maintained in the male line yet it is easily lost in the triplo-X strain.

The synaptonemal complexes of Caenorhabditis elegans: pachytene karyotype analysis of hermaphrodites from the recessive him-5 and him-7 mutants

1986 ◽  
Vol 82 (1) ◽  
pp. 119-127
Author(s):  
P. Goldstein
Keyword(s):  
Caenorhabditis Elegans ◽  
X Chromosome ◽  
High Frequency ◽  
Karyotype Analysis ◽  
Nuclear Morphology ◽  
Group V ◽  
Haploid Chromosome Number ◽  
High Incidence ◽  
Physical Position ◽  
Pachytene Karyotype

The him-5 and him-7 mutants (high incidence of males) of Caenorhabditis elegans both showed increased rates of X chromosome non-disjunction (16% and 3%, respectively) but him-7 also had a high frequency of autosomal non-disjunction (34%). Synaptonemal complex (SC) karyotype analysis revealed a haploid chromosome number of six in each strain. Alterations in him-7 nuclear morphology were observed but there were no aberrations in SC structure that could account for the increased frequency of autosomal non-disjunction. However, the frequency of X-chromosome non-disjunction occurred at predicted rates on the basis of the number of disjunction regulator regions (DRRs) present on the SCs. The observation that the levels of X-chromosome non-disjunction were not influenced by the increase in the frequency of autosomal non-disjunction supports the notion that the X chromosome is subject to separate controls during meiosis. The him-7 mutant is nested within the rad-4 map region on linkage group V, however, SC analysis did not reveal the physical position on the chromosome because of synaptic adjustment.

Karyotype analysis of Meloidogyne hapla by 3-D reconstruction of synaptonemal complexes from electron microscopy of serial sections

Chromosoma ◽  
1978 ◽  
Vol 70 (1) ◽  
pp. 131-139 ◽  
Author(s):  
Paul Goldstein ◽  
A. C. Triantaphyllou
Keyword(s):  
Electron Microscopy ◽  
Karyotype Analysis ◽  
Meloidogyne Hapla ◽  
Serial Sections ◽  
Synaptonemal Complexes

Pachytene karyotype analysis of tetraploid Meloidogyne hapla females by electron microscopy

Chromosoma ◽  
1981 ◽  
Vol 84 (3) ◽  
pp. 405-412 ◽  
Author(s):  
Paul Goldstein ◽  
A. C. Triantaphyllou
Keyword(s):  
Electron Microscopy ◽  
Karyotype Analysis ◽  
Meloidogyne Hapla ◽  
Pachytene Karyotype

scholarly journals Exposure to the anthelmintic dinitroaniline oryzalin causes changes in meiotic prophase morphology and loss of synaptonemal complexes in the nematode Caenorhabditis elegans

2021 ◽  
Vol 2 ◽  
Author(s):  
Paul Goldstein
Keyword(s):  
Caenorhabditis Elegans ◽  
Nuclear Matrix ◽  
Meiotic Prophase ◽  
Parasitic Nematodes ◽  
Nematode Caenorhabditis Elegans ◽  
Synaptonemal Complexes ◽  
Prophase I ◽  
Meiotic Prophase I

Abstract The anthelmintic dinitroaniline oryzalin interferes with the formation of microtubules and inhibits meiosis and mitosis in nematodes. Exposure to oryzalin resulted in deterioration in morphology of the oocytes and loss of synaptonemal complexes at meiotic prophase I. The nuclear matrix and envelope were poorly formed, and the central rachis was diminished. These results provide the basis for the loss of fecundity after treatment with the oryzalin resulting in control of parasitic nematodes.

The synaptonemal complexes of Caenorhabditis elegans

Chromosoma ◽  
1982 ◽  
Vol 84 (4) ◽  
pp. 585-597 ◽  
Author(s):  
Paul Goldstein ◽  
Darlina E. Slaton
Keyword(s):  
Caenorhabditis Elegans ◽  
Synaptonemal Complexes
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