Chromosome behavior during cleavage in the eggs of Sciara coprophila (Diptera) in the relation to the problem of sex determination

Bois, Anne Marie Du

doi:10.1007/bf00393361

Cited by 53 publications

(47 citation statements)

References 20 publications

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“…However, in some cases the chromosomal differences determining gender are brought about by specialised behaviour of the X chromosomes during the first stages of embryonic development. This is the case of the dipteran families Cecydomyiidae (White, 1973;Stuart and Hatchett, 1991) and Sciaridae (DuBois, 1933;Metz, 1938), which belong to the subor-der Nematocera.…”

Section: Sex Determination Mechanisms Based On X Chromosome Eliminatimentioning

confidence: 99%

“…Consequently, Sciara embryos start development with two sets of autosomes and three X chromosomes (3X;2A), two of which are sister chromatids of paternal origin (Metz, 1938). When the zygotic nuclei reach the egg cortex, one paternal X chromosome is eliminated in the somatic cells of embryos destined to be females (2X;2A) and two are eliminated in those destined to become males (X;2A) (DuBois, 1933;Perondini et al, 1986). Therefore, in the formation of the X/A chromosomal signal in sciarids an "imprinting" process must occur in one of the parents, which determines that the chromosomes to be eliminated are of paternal origin.…”

Section: Sex Determination Mechanisms Based On X Chromosome Eliminatimentioning

confidence: 99%

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Sex-determining mechanisms in insects

2008

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Sex determination refers to the developmental programme that commits the embryo to either the male or the female pathway. The animal kingdom possesses a wealth of mechanisms via which gender is decided, all of which are represented among the insects. This manuscript focuses on a number of insects for which genetic and molecular data regarding sex determination mechanisms are available. The sex determination genetic cascade of Drosophila melanogaster is first discussed, followed by an analysis of the sex determination genes of other dipteran and nondipteran insects. Representative examples of sex determination mechanisms that differ in their primary signal are also described. Finally, some evolutionary aspects of these mechanisms are discussed.

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Section: Sex Determination Mechanisms Based On X Chromosome Eliminatimentioning

confidence: 99%

Section: Sex Determination Mechanisms Based On X Chromosome Eliminatimentioning

confidence: 99%

Sex-determining mechanisms in insects

2008

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“…According to previous authors (DuBois, 1932(DuBois, , 1933Metz and Lawrence, 1938;Metz, 1942Metz, , 1959Grouse, 1943;Grouse et al 1971) the gynandromorphs observed in sciarid flies are a consequence of errors in the elimination of X-chromosomes in early embryogenesis. The same interpretation may explain the origin of the gynandromorphs observed in the present analysis.…”

Section: Resultsmentioning

confidence: 95%

“…During male meiosis the chromosomes receive an imprint which permits them to be recognised in the embryo as paternally derived chromosomes (Grouse, 1960(Grouse, , 1966(Grouse, , 1977. In the cytoplasm of the zygote there must exist a second mechanism for the recognition of these imprinted chromosomes and which causes their elimination during the fifth to ninth cleavages of the zygote nuclei (DuBois, 1933;Crouse, 1960;Rieffel and Grouse, 1966). The sepia mutation could exert its effects by modifying one, or both, of these mechanisms.…”

Section: Resultsmentioning

confidence: 99%

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A gene that modifies the sex ratio in a bisexual strain of Sciara ocellaris

1979

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SUMMARYThe influence of an X-linked recessive mutation, sepia, on the sex determination of a bisexual strain of Sciara ocellaris was studied. It induces an alteration in the sex ratio, especially in the progeny of heterozygous females, increasing the proportinn of males. These results cannot be explained by differential fecundity of the female parents of different genotypes nor by differential mortality between the sexes. The occurrence of gynandromorphs indicates that the mutant probably interferes with the processes of X-chromosnme elimination. Observations that heterozygous females which received the sepia allele from their mothers produced a higher frequency of gynandromorphs than females which received the mutated allele from their male parents, suggest that the mutation is interfering with the mechanism of chromosome elimination present in the egg cytoplasm.

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Mechanisms of epigenetic loss of chromosomes in insects

Goday

Ruiz

2005

Encyclopedia of Genetics, Genomics, Proteomics and Bioinformatics

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Chromosome elimination is a widespread developmental phenomenon in insects. The main types of chromosome elimination take place at early embryonic somatic cleavages and at the first male meiotic division. The cellular mechanisms responsible for both elimination types are different but show common aspects in Diptera, notably unusual anaphase behavior of the chromosomes to be eliminated. Chromosome elimination can be parent‐of‐origin specific, highlighting this phenomenon as an example of genomic imprinting.

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Chromosome behavior during cleavage in the eggs of Sciara coprophila (Diptera) in the relation to the problem of sex determination

Cited by 53 publications

References 20 publications

Sex-determining mechanisms in insects

Sex-determining mechanisms in insects

A gene that modifies the sex ratio in a bisexual strain of Sciara ocellaris

Mechanisms of epigenetic loss of chromosomes in insects

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