Genetic engineering by the manipulation of chromosomes

Purdom, C. E.

doi:10.1016/0044-8486(83)90409-x

Cited by 168 publications

(60 citation statements)

References 34 publications

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“…Essa esteri lidade é atribu ída à presença do conjunto cromossômico extra, que causa a interrupção da meiose I, na gametogênese, resultando em di ferentes níveis de supressão do desenvolvimento gonadal (DONALDSON & HUNTER 1982;THORGAARD 1983;PURDOM 1983; [HSSEN et aI. 1990).…”

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Hematologia comparada entre diplóides e triplóides de truta arco-íris, Oncorhynchus mykiss walbaum (Pisces, Salmonidae)

1998

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Hematologia comparada entre diplóides e triplóides de truta arco-íris, Oncorhynchus mykiss walbaum (Pisces, Salmonidae)

1998

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“…For example, a pressure or temperature shock shortly after activation of eggs by genetically inert spermatozoa induces diploidy through the retention of the chromosome set destined to become the second polar body (Purdom, 1983). The heterozygosity of such gynogenetic diploid individuals depends upon the rate of second meiotic division segregation, y (Allendorf and Leary, 1984).…”

Section: Introductionmentioning

confidence: 99%

Heterozygosity and developmental stability in gynogenetic diploid and triploid rainbow trout

et al. 1985

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We have previously reported that rainbow trout (Salmo gairdneri) more heterozygous at enzyme loci generally show increased developmental stability, as measured by reduced fluctuating asymmetry. We experimentally produced gynogenetic diploid and triploid individuals to test the effect of extreme heterozygosities on developmental stability. Gynogenetic diploids are identical by descent at an estimated 34 per cent of all loci and show a 50 per cent increase in the mean proportion of traits asymmetric per individual compared to normal rainbow trout. Triploids from two different strains have an estimated 30 per cent increase in genomic heterozygosity and a 14 per cent decrease in the mean proportion of traits asymmetric per individual compared to normal diploids. These changes in asymmetry induced by gynogenesis and triploidy are not as great as we expected based on the association between heterozygosity and fluctuating asymmetry in random mating populations. The narrow range of mean asymmetry in rainbow trout may result from an upper limit restricted by directional selection for developmental stability and a lower limit determined by inherent randomness in the developmental process.

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“…Namely, suppressed gonadal development in triploid individual may allow metabolic energy and nutritional resources, normally used for development of sexual characteristics and reproduction, to be directed into faster somatic growth (Thorgaard, 1983). Experimentally, triploids have been induced by different treatments (chemical and mechanical) (Purdom, 1983;Thorgaard, 1983;Teskeredzic et al, 1993). The most common method for inducing triploidy is thermal shock.…”

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Micronucleus occurrence in diploid and triploid rainbow trout (Oncorhynchus mykiss Walbaum)

Strunjak‐Perović¹,

Čož‐Rakovac²,

Popović³

2003

Vet. Med. - Czech

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ABSTRACT:The aim of the study was to observe the influence of different ploidy levels in fish on micronucleus occurrence. Twenty minutes a�er fertilization, one group of rainbow trout eggs was exposed to water temperatures of 26°C in duration of 20 minutes to induce triploidy. Second group was kept in water temperature of 10°C, which is optimal for development of rainbow trout. The frequency of micronucleated erythrocytes was determined in the peripheral circulation of rainbow trout 67 days (following absorption of the yolk -swim-up stage) and 128 days (fry stage) post fertilization. There was a significant difference (P < 0.001) between frequency of micronucleated erythrocytes of diploid (1.10 ± 0.96‰) and triploid (2.41 ± 1.28‰) fish at swim-up stage. Increased mean values of micronucleus in diploid (1.80 ± 1.57‰) and triploid (5.92 ± 3.80‰) fry were also recorded.

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Genetic engineering by the manipulation of chromosomes

Cited by 168 publications

References 34 publications

Hematologia comparada entre diplóides e triplóides de truta arco-íris, Oncorhynchus mykiss walbaum (Pisces, Salmonidae)

Hematologia comparada entre diplóides e triplóides de truta arco-íris, Oncorhynchus mykiss walbaum (Pisces, Salmonidae)

Heterozygosity and developmental stability in gynogenetic diploid and triploid rainbow trout

Micronucleus occurrence in diploid and triploid rainbow trout (Oncorhynchus mykiss Walbaum)

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