Regulation of Parent-of-Origin Allelic Expression in the Endosperm

Hornslien, Karina S.; Miller, Jason R.; Grini, Paul E.

doi:10.1104/pp.19.00320

Cited by 28 publications

(65 citation statements)

References 96 publications

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“…Here, we show that AGL90 is maternally biased in its expression but the paternal allele show accession dependent imprinting and is not completely silenced from Col-0 pollen donors (Figures 2a and S2). A similar lack of silencing of the AGL90 paternal Col-0 allele was recently also reported (Hornslien et al, 2019). In contrast, AGL28 was previously reported not to be imprinted (Zhang et al, 2018), or to display accession dependent imprinting in hybrids (Wolff et al, 2011).…”

Section: Imprinting and Regulation Of MC And Ma Mads-box Genessupporting

confidence: 69%

“…Using Col-0 and Tsu-1 accession-specific single nucleotide polymorphisms (SNP), we analyzed AGL28, AGL35, AGL36 and AGL90 in 4 DAP Col-0 Tsu-1 hybrid seeds (Figure 2a). Maternal bias from the seed coat could be excluded, as all transcripts were previously shown to be enriched >8-fold 4 DAP in the peripheral endosperm (AGL36, AGL90) compared to all other seed tissues or >8-fold and >5-fold enriched in the chalazal endosperm (AGL35 and AGL28, respectively) (Belmonte et al, 2013;Hornslien et al, 2019). AGL34 was not expressed at a sufficient level in 4 DAP Tsu-1 and was thus omitted.…”

Section: Imprinting and Regulation Of MC And Ma Mads-box Genesmentioning

confidence: 99%

“…Note that genes within groups show similar gene expression profiles, with a common maximum reached between three and six DAP. outcrosses and therefore more likely devoid of such effects (Hornslien et al, 2019). According to a report investigating the role of small interfering (si) RNA and RdDM in interploidy crosses, several MADS-box type I genes, including AGL36, were deregulated in diploid crosses with NUCLEAR RNA POLYMERASE D1 (NRPD1) mutant mothers, deficient in the largest subunit of RNA polymerase IV, a key component of canonical RdDM (Lu et al, 2012).…”

Section: Imprinting and Regulation Of MC And Ma Mads-box Genesmentioning

confidence: 99%

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Genetic variation and temperature affects hybrid barriers during interspecific hybridization

et al. 2019

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Genomic imprinting regulates parent-specific transcript dosage during seed development and is mainly confined to the endosperm. Elucidation of the function of many imprinted genes has been hampered by the lack of corresponding mutant phenotypes, and the role of imprinting is mainly associated with genome dosage regulation or allocation of resources. Disruption of imprinted genes has also been suggested to mediate endosperm-based post-zygotic hybrid barriers depending on genetic variation and gene dosage. Here, we have analyzed the conservation of a clade from the MADS-box type I class transcription factors in the closely related species Arabidopsis arenosa, A. lyrata, and A. thaliana, and show that AGL36-like genes are imprinted and maternally expressed in seeds of Arabidopsis species and in hybrid seeds between outbreeding species. In hybridizations between outbreeding and inbreeding species the paternally silenced allele of the AGL36-like gene is reactivated in the hybrid, demonstrating that also maternally expressed imprinted genes are perturbed during hybridization and that such effects on imprinted genes are specific to the species combination. Furthermore, we also demonstrate a quantitative effect of genetic diversity and temperature on the strength of the post-zygotic hybridization barrier. Markedly, a small decrease in temperature during seed development increases the survival of hybrid F1 seeds, suggesting that abiotic and genetic parameters play important roles in post-zygotic species barriers, pointing at evolutionary scenarios favoring such effects.

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Section: Imprinting and Regulation Of MC And Ma Mads-box Genessupporting

confidence: 69%

Section: Imprinting and Regulation Of MC And Ma Mads-box Genesmentioning

confidence: 99%

Section: Imprinting and Regulation Of MC And Ma Mads-box Genesmentioning

confidence: 99%

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Genetic variation and temperature affects hybrid barriers during interspecific hybridization

et al. 2019

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“…Thus, the parental (maternal and paternal) genomes are not functionally equivalent due to genomic imprinting [ 6 ]. It seems remarkable that genomic imprinting is now reliably known in plants, in particular dicotyledons and monocotyledons [ 7 , 8 ], first of all, for the endosperm—a highly specialized tissue that not only provides the embryo with necessary nutrients, but also plays a special biological role in the process of formation of seeds and fruits. Although both the embryo and endosperm arise in the same system of the embryo sac after fertilization, they differ in the nature of their reactions to the influence of various factors.…”

Section: Introductionmentioning

confidence: 99%

Endosperm of Angiosperms and Genomic Imprinting

Kordyum

Mosyakin

2020

Life

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Modern ideas about the role of epigenetic systems in the regulation of gene expression allow us to understand the mechanisms of vital activities in plants, such as genomic imprinting. It is important that genomic imprinting is known first and foremost for the endosperm, which not only provides an embryo with necessary nutrients, but also plays a special biological role in the formation of seeds and fruits. Available data on genomic imprinting in the endosperm have been obtained only for the triploid endosperm in model plants, which develops after double fertilization in a Polygonum-type embryo sac, the most common type among angiosperms. Here we provide a brief overview of a wide diversity of embryo sacs and endosperm types and ploidy levels, as well as their distribution in the angiosperm families, positioned according to the Angiosperm Phylogeny Group IV (APG IV) phylogenetic classification. Addition of the new, non-model taxa to study gene imprinting in seed development will extend our knowledge about the epigenetic mechanisms underlying angiosperm fertility.

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“…The study of 'maternal excess' and 'paternal excess' endosperms (Haig and Westoby, 1991) has been a focus of research with the ratio of maternal to paternal genomes in endosperms now widely accepted as making a difference during development. The mechanisms of these effects remain areas of active research and debate (Hornslien et al, 2019;Satyaki and Gehring, 2019).…”

Section: Why Is Endosperm (Mostly) Triploid?mentioning

confidence: 99%

Poles Apart: Monosporic, Bisporic, and Tetrasporic Embryo Sacs Revisited

Haig

2020

Front. Ecol. Evol.

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Bisporic embryo sacs contain nuclei derived from two members of a megaspore tetrad whereas tetrasporic embryo sacs contain nuclei derived from all four members of a tetrad. Megaspores from the same tetrad are less genetically similar than are megaspores from different tetrads. Therefore, cells derived from different megaspores in bisporic and tetrasporic embryo sacs are expected to compete with each other rather than cooperate. The tacit assumption of the plant embryological literature that bisporic and tetrasporic embryo sacs function as integrated organisms is demonstrably false, both theoretically and empirically. This competition within embryo sacs can be expressed as the formation of eggs by descendants of more than one megaspore or by the suppression of the descendants of all but one megaspore. Both phenomena have evolved multiple times. In contrast, all nuclei of monosporic female gametophytes are genetically identical. Consequently, monosporic development is predicted to be more evolutionarily stable than bisporic or tetrasporic development. The triploid endosperm produced by most monosporic gametophytes was probably derived from an ancestrally diploid endosperm and has been considered a key adaptation of the most successful lineages of flowering plants. The greater weight given to the doubled maternal genome in triploid endosperm may have facilitated a more efficient distribution of resources among a mother's seeds because it reduced the influence of competition for maternal resources among unrelated paternal genomes of endosperm.

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Regulation of Parent-of-Origin Allelic Expression in the Endosperm

Cited by 28 publications

References 96 publications

Genetic variation and temperature affects hybrid barriers during interspecific hybridization

Genetic variation and temperature affects hybrid barriers during interspecific hybridization

Endosperm of Angiosperms and Genomic Imprinting

Poles Apart: Monosporic, Bisporic, and Tetrasporic Embryo Sacs Revisited

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