Project description:Numerous studies have demonstrated that golden pompano (Trachinotus blochii) is sensititive to hypoxia, which causes a devastating blow to the golden pompano industry. And different methods of reoxygenation after hypoxia could bring differnt effects on metabolism for golden pompano.
Project description:Apple leaf spot caused by the Alternaria alternata f. sp. mali (ALT1) fungus is one of the most devastating diseases of apple (Malus × domestica). We identified a hairpin RNA (hpRNA)-mediated small RNAs, MdhpRNA277, from apple (cv. ‘Golden Delicious’) that is induced by infection with ALT1. MdhpRNA277 produces mdm-siR277-1 and mdm-siR277-2, which target five R genes, MdRNL1, MdRNL2, MdRNL3, MdRNL4, and MdRNL5, that are expressed at high levels in the resistant apple variety ‘Hanfu’ and at low levels in the susceptible variety ‘Golden Delicious’ following ALT1 infection. MdhpRNA277 is strongly induced in ‘Golden Delicious’ but was not induced in ‘Hanfu’ following ALT1 inoculation. The promoter activity of MdhpRNA277 was much stronger in ‘Golden Delicious’ than in ‘Hanfu’ after ALT1 inoculation. We identified a single nucleotide polymorphism (SNP) in the MdhpRNA277 promoter region between the susceptible variety ‘Golden Delicious’ (pMdhpRNA277-GD) and resistant variety ‘Hanfu’ (pMdhpRNA277-HF). The transcription factor MdWHy binds to pMdhpRNA277-GD, but not to pMdhpRNA277-HF. Transgenic ‘GL-3’ apple lines expressing pMdhpRNA277-GD: MdhpRNA277 were more susceptible to ALT1 infection than were those expressing pMdhpRNA277-HF:MdhpRNA277 due to induced mdm-siR277 accumulation and low levels of expression of the five target R genes. The failure of MdWHy to bind to pMdhpRNA277-HF might contribute to the low levels of MdhpRNA277 and mdm-siR277-1/-2 expression and the high levels of R gene expression and resistance to Alternaria leaf spot in resistant apple varieties. We confirmed that the SNP in pMdhpRNA277 is associated with Alternaria leaf spot resistance by analyzing the progeny of three additional crosses. The SNP identified in this study could be used as a marker to distinguish between apple varieties that are resistant or susceptible to Alternaria leaf spot.
Project description:We measured mRNA abundance in the seedling leaves of the barley genotypes Golden Promise and Morex and in F1 hybrids generated using either Golden Promise as a maternal genotype and Morex as paternal or other way around. 3 biological replicates each, total 12 chips.
Project description:The piRNA pathway is essential for female fertility in golden hamsters and likely humans, but not in mice. However, the role of individual PIWIs in reproduction remains poorly understood outside of mice. Here, using golden hamsters, we establish dynamic expression profiles and subcellular localization for all four PIWIs and characterize their associated reproductive defects in knockout mutants. In female golden hamsters, PIWIL1 and PIWIL3 are highly expressed throughout oogenesis and early embryogenesis, while PIWIL1 knockout leads to sterility, and PIWIL3 deficiency results in subfertility with lagging zygotic development. PIWIL1 can partially compensate for TE silencing and transcriptional regulation in PIWIL3 knockout females, but not vice versa. PIWIL1 and PIWIL4 are the predominant PIWIs expressed in adult or postnatal testes, respectively, while PIWIL2 is present in both stages. Notably, in golden hamsters, none of the differences were found between pre-pachytene and pachytene piRNAs characteristic of mice. Loss of any PIWI expressed in testes leads to sterility and severe but distinct spermatogenesis disorders, which are markedly less severe in mice. These findings expand our understanding of the non-redundant PIWI-piRNA regulatory functions in gametogenesis and early embryogenesis in golden hamster, increasing the value of this model for studying human fertility.
Project description:Numerous studies have demonstrated that the C. irritans can be efficiently propagated in the animal model golden pompano (Trachinotus blochii), especially in the process of intensive high-density culture, which causes large-scale infection and triggers bacterial invasion is a devastating blow to the golden pompano industry. This is in sharp contrast to the low sensitivity of S. oramin to C. irritans.
Project description:Genome wide DNA methylation profiling of normal and APP/PSEN1 mice. A custom Illumina Golden Gate DNA methylation Beadchip was used to obtain DNA methylation profiles across approximately 800 CpGs. Bisulphite converted DNA from the 96 samples were hybridised to the Illumina custom golden gate DNA methylation array.
