Inheritance and linkage of isozymes in Yponomeuta padellus (Lepidoptera, Yponomeutidae)

RAIJMANN, LÉON E L; GINKEL, WIL E VAN; HECKEL, DAVID G; MENKEN, STEPH B J

doi:10.1038/sj.hdy.6881580

Cited by 4 publications

(3 citation statements)

References 2 publications

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“…Because discerning the sex of the sampled individual would make these data more meaningful in the context of dosage compensation, we assayed SNPs in the data, assuming that only a male would show heterozygosity on the Z. This is a reasonable assumption given that there is ample allozyme evidence for diploid, heterozygous expression of Z-linked loci in male Lepidoptera (Mallet et al 1993; Raijmann et al 1997); there is also little evidence for any Z-W homology in Bombyx so it is unlikely that apparent Z-linked heterozygosity could arise from pseudoautosomal regions such as occurs between X and Y chromosomes in humans (Fujii and Shimada 2007). We identified 182 heterozygous Z-linked SNPs, a count which falls squarely in the range detected among autosomes using the same criteria (132–569 SNPs per chromosome).…”

Section: Resultsmentioning

confidence: 99%

Getting a Full Dose? Reconsidering Sex Chromosome Dosage Compensation in the Silkworm, Bombyx mori

Walters

Hardcastle

2011

Genome Biology and Evolution

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Dosage compensation—equalizing gene expression levels in response to differences in gene dose or copy number—is classically considered to play a critical role in the evolution of heteromorphic sex chromosomes. As the X and Y diverge through degradation and gene loss on the Y (or the W in female-heterogametic ZW taxa), it is expected that dosage compensation will evolve to correct for sex-specific differences in gene dose. Although this is observed in some organisms, recent genome-wide expression studies in other taxa have revealed striking exceptions. In particular, reports that both birds and the silkworm moth (Bombyx mori) lack dosage compensation have spurred speculation that this is the rule for all female-heterogametic taxa. Here, we revisit the issue of dosage compensation in silkworm by replicating and extending the previous analysis. Contrary to previous reports, our efforts reveal a pattern typically associated with dosage compensated taxa: the global male:female expression ratio does not differ between the Z and autosomes. We believe the previous report of unequal male:female ratios on the Z reflects artifacts of microarray normalization in conjunction with not testing a major assumption that the male:female global expression ratio was unbiased for autosomal loci. However, we also find that the global Z chromosome expression is significantly reduced relative to autosomes, a pattern not expected in dosage compensated taxa. This combination of male:female parity with an overall reduction in expression for sex-linked loci is not consistent with the prevailing evolutionary theory of sex chromosome evolution and dosage compensation.

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Section: Resultsmentioning

confidence: 99%

Getting a Full Dose? Reconsidering Sex Chromosome Dosage Compensation in the Silkworm, Bombyx mori

Walters

Hardcastle

2011

Genome Biology and Evolution

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“…The accumulation of gene complexes on the Z chromosome could facilitate host shifts, because in the heterogametic sex co‐adaption of multiple host use, loci would not be disrupted by recombination (Hagen & Scriber, 1995). However, it is unclear why this phenomenon should be especially pronounced in Lepidoptera (Pashley‐Prowell, 1998), since in this insect order female autosomes do not undergo recombination either (Traut & Marec, 1996; Raijmann et al., 1997), and linkage groups will therefore be favoured equally on autosomes and sex chromosomes.…”

Section: Discussionmentioning

confidence: 99%

Inheritance and plasticity of adult host acceptance in Yponomeuta species: implications for host shifts in specialist herbivores

Hora

Roessingh

Menken

2005

Entomologia Exp Applicata

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Changes in host acceptance is an important factor in the host specialization of phytophagous insects, and knowledge of the genetic organization of this behaviour is necessary in order to understand how host shifts occur. Here we describe the inheritance of adult host acceptance (oviposition) in three closely related species of Yponomeuta Latreille (Lepidoptera: Yponomeutidae), and their interspecific padellus still deposited more than half of their egg masses on E. europaeus . Reciprocal hybrids did not differ in their host acceptance, indicating that the trait is autosomal. We further studied the effect of larval food on adult host acceptance ('Hopkins host selection principle') in split full-sib F1 families. Larval diet influenced oviposition only in one of two hybrid crosses. The F1 hybrid of Y. padellus × Y. cagnagellus , reared on Prunus spinosa L . , deposited a significantly lower percentage of egg masses on E. europaeus compared to their full-sib sisters fed with E. europaeus . We did not find this in the reciprocal cross. However, still more than half of the egg masses are deposited on E. europaeus by hybrids that have no experience on this host. We conclude that the semi-dominant character of acceptance of E. europaeus and a tendency of Rosaceae-feeding Yponomeuta to deposit egg masses on this host may have created the opportunity for the host shift of the predecessor of Y. cagnagellus from Rosaceae to the Celastraceae. This shift may have been further facilitated by a weak tendency of adults to oviposit on their larval food source.

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“…Fusions between sex chromosomes and autosomes to form so‐called neo‐X and neo‐Y chromosomes have been reported from several insect taxa, such as Coleoptera (Smith & Virkki, 1978; Petitpierre et al., 1988; Virkki, 1988; Macaisne et al., 2006), Diptera (Berlocher, 1984; McPheron & Berlocher, 1985; Bachtrog, 2006; Flores et al., 2008; McAllister et al., 2008), Lepidoptera (Nilsson et al., 1988; Raijmann et al., 1997; Yoshido et al., 2011), Orthoptera (John & Hewitt, 1970; Barton, 1980; Tatsuta et al., 2006; Castillo et al., 2010), and Heteroptera (Bressa et al., 2009), and seems to be a common event in the evolution of sex chromosomes (Charlesworth & Charlesworth, 2005; Kaiser & Bachtrog, 2010). Fusions can involve the Y‐chromosome and an autosome (Bachtrog, 2006), the X‐chromosome and an autosome (John & Hewitt, 1970; Tatsuta et al., 2006; McAllister et al., 2008), or both (Macaisne et al., 2006; Castillo et al., 2010).…”

Section: Discussionmentioning

confidence: 99%

Non‐random segregation of an autosomal gene in males of the flea beetle, Phyllotreta nemorum: implications for colonization of a novel host plant

Nielsen¹

2012

Entomologia Exp Applicata

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The flea beetle, Phyllotreta nemorum (L.) (Coleoptera: Chrysomelidae: Alticinae), is currently expanding its host plant range in Europe. The ability to utilize a novel host plant, Barbarea vulgaris R. Br. (Brassicaceae), is controlled by major dominant genes named R‐genes. The present study used extensive crossing experiments to illustrate a peculiar mode of inheritance of the R‐gene in a population from Delemont (Switzerland). When resistant males from Delemont are mated with recessive females from a laboratory line, the female F1 offspring contains the R‐allele and is able to utilize B. vulgaris, whereas the male offspring contains the r‐allele and is unable to utilize the plant. This outcome suggests X‐linkage of the R‐gene, but further crossing experiments demonstrated that this was not the case. When the R‐gene is present in offspring from males from a laboratory line that originates from Taastrup (Denmark), it is transmitted to female and male offspring in equal proportions as a normal autosomal gene. The results demonstrate a polymorphism in segregation patterns of an autosomal R‐gene in P. nemorum males. Males from Delemont contain a factor which causes non‐random segregation of the R‐gene (NRS‐factor). This factor is inherited patrilineally (from fathers to sons). Males with the NRS‐factor transmit the R‐gene to their female offspring, whereas males without the NRS‐factor transmit the R‐gene to female and male offspring in equal proportions. Various models for the non‐random segregation of autosomes in P. nemorum males are discussed – e.g., fusions between autosomes and sex chromosomes, and genomic imprinting. The implications of various modes of inheritance of R‐genes for the ability of P. nemorum populations to colonize novel patches of B. vulgaris are discussed.

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Inheritance and linkage of isozymes in Yponomeuta padellus (Lepidoptera, Yponomeutidae)

Cited by 4 publications

References 2 publications

Getting a Full Dose? Reconsidering Sex Chromosome Dosage Compensation in the Silkworm, Bombyx mori

Getting a Full Dose? Reconsidering Sex Chromosome Dosage Compensation in the Silkworm, Bombyx mori

Inheritance and plasticity of adult host acceptance in Yponomeuta species: implications for host shifts in specialist herbivores

Non‐random segregation of an autosomal gene in males of the flea beetle, Phyllotreta nemorum: implications for colonization of a novel host plant

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