Exposure of meiosis-to-microspore-stage tomato flowers to long-term mild heat results in pollen failure after mitosis.
Ontology highlight
ABSTRACT:
PROVIDER: PRJNA746951 | ENA |
REPOSITORIES: ENA
Similar Datasets
Project description:Crop reproductive success is significantly challenged by heatwaves, which are increasing in frequency globally. The main reason is reduced male fertility due to abnormal pollen development, but the mechanism behind the developmental deviation is not well understood. Here, long-term mild heat (LTMH) treatment, mimicking a heatwave, was applied to flowers or whole plants and followed up by cytological, transcriptomic and biochemical analyses. LTMH was shown to act directly on the flowers and not via a systemic effect on other plant tissue. The meiosis to early microspore stage was the most to LTMH and three to four days of LTMH exposure around this period was sufficient to significantly reduce pollen viability. Extensive cytological analysis showed that abnormalities in pollen development could first be observed after pollen mitosis I and tapetum development appeared unaffected. Transcriptomic and biochemical analyses suggested that pollen development suffers from tapetal ER stress, with a limited role for oxidative stress. These characteristics differentiate the response of developing anthers and pollen to LTMH from that to severe heat stress.
2021-07-17 | GSE180168 | GEO
Project description:We investigated how MEIOC affects testicular germ cells at the transition from mitosis to meiosis. We used single cell RNA sequencing (scRNA-seq) to identify and analyze the germ cells present in the P15 testis.
2024-04-16 | GSE230746 | GEO
Project description:We investigated how MEIOC affects testicular germ cells at the transition from mitosis to meiosis. We performed gene expression profiling analysis using data obtained from RNA-seq of preleptotene-enriched testes from wild-type and Meioc KO pups.
2024-04-16 | GSE230743 | GEO
Project description:The male germline transcriptome changes dramatically during the mitosis-to-meiosis transition to activate late spermatogenesis genes and to transiently suppress genes commonly expressed in somatic lineages and spermatogenesis progenitor cells, termed somatic/progenitor genes. These changes reflect epigenetic regulation. Induction of late spermatogenesis genes during spermatogenesis is facilitated by poised chromatin established in the stem cell phases of spermatogonia, whereas silencing of somatic/progenitor genes during meiosis and postmeiosis is associated with formation of bivalent domains which also allows the recovery of the somatic/progenitor program after fertilization. Importantly, during spermatogenesis mechanisms of epigenetic regulation on sex chromosomes are different from autosomes: X-linked somatic/progenitor genes are suppressed by meiotic sex chromosome inactivation without deposition of H3K27me3. Our results suggest that bivalent H3K27me3 and H3K4me2/3 domains are not limited to developmental promoters (which maintain bivalent domains that are silent throughout the reproductive cycle), but also underlie reversible silencing of somatic/progenitor genes during the mitosis-to-meiosis transition in late spermatogenesis. 29 samples analyzed by ChIP-Seq
2015-06-18 | E-GEOD-69946 | biostudies-arrayexpress
Project description:Transcriptional profiling of mitotic archesporial cells, early pollen mother cells and pollen mother cells comparing control tapetal cells, pollen, parenchyma cells and seedling. Goal was explain the mitosis/meiosis transition at the molecular level.
2017-12-01 | GSE70215 | GEO
Project description:The male germline transcriptome changes dramatically during the mitosis-to-meiosis transition to activate late spermatogenesis genes and to transiently suppress genes commonly expressed in somatic lineages and spermatogenesis progenitor cells, termed somatic/progenitor genes. These changes reflect epigenetic regulation. Induction of late spermatogenesis genes during spermatogenesis is facilitated by poised chromatin established in the stem cell phases of spermatogonia, whereas silencing of somatic/progenitor genes during meiosis and postmeiosis is associated with formation of bivalent domains which also allows the recovery of the somatic/progenitor program after fertilization. Importantly, during spermatogenesis mechanisms of epigenetic regulation on sex chromosomes are different from autosomes: X-linked somatic/progenitor genes are suppressed by meiotic sex chromosome inactivation without deposition of H3K27me3. Our results suggest that bivalent H3K27me3 and H3K4me2/3 domains are not limited to developmental promoters (which maintain bivalent domains that are silent throughout the reproductive cycle), but also underlie reversible silencing of somatic/progenitor genes during the mitosis-to-meiosis transition in late spermatogenesis.
2015-06-18 | GSE69946 | GEO
Project description:In plants, sperm cell formation involves two rounds of pollen mitoses, in which the microspore initiates the first pollen mitosis (PMI) to produce a vegetative cell and a generative cell, then the generative cell continues the second mitosis (PMII) to produce two sperm cells. DUO1, a R2R3 Myb transcription factor, is activated in the generative cell to promote S-G2/M transition during PMII. Loss-of-function of DUO1 caused a complete arrest of PMII. Despite the importance of DUO1, how DUO1 is regulated is largely unexplored. We previously demonstrated that ARID1, an ARID transcription factor, stimulates DUO1 transcription. Here, we show that cell proliferation suppressor RBR1 interacts with ARID1 to stabilize DUO1. While the C-terminus of RBR1 is dispensable for vegetative growth, it plays a crucial role in reproductive development and facilitates interaction with ARID1. Moreover, DUO1 is a short-lived protein, ARID1 promotes the RBR1-DUO1 interaction, and RBR1 stabilizes DUO1 in a proteasome-dependent manner. Thus, RBR1 promotes DUO1-dependent PMII progression via antagonizing its repressive role in the cell cycle factors CDKA;1 and CYCB1;1. Collectively, we uncover that ARID1 and RBR1 act in concert to regulate DUO1 at both the transcriptional and post-transcriptional levels, balancing cell specification and cell division.
2025-01-02 | GSE275530 | GEO
Project description:Purpose:The molecular mechanism of pollen abortion in interspecific hybrids of B.rapa and B.nigra was revealed by cytological and transcriptional analysis Methods:floral buds (contain two developmental progress,1.1-1.5 mm and 1.5-6.0 long floral buds) were collected, then Separated male organs were kept in liquid nitrogen immediately until use. Total RNA was extracted using the TRIzol reagent (Invitrogen, Waltham, MA, USA). DNase (Promega, USA) was used to remove potential DNA contamination. For the quantitative real-time polymerase chain reaction (qRT-PCR) analysis Results:In this study, there were extensive variations in gene expression patterns of this hybrid, and down-regulated expression of key genes for pollen development, such as meiosis of pollen mother cells, DNA damage repair and pollen sperm cell differentiation, may lead to pollen abortion. Styrene-propyl synthesis and wax biosynthesis pathway were blocked, which affected pollen wall formation. Conclusions:The wide variation of genes showed that the expression of A and B genomes were affected differently. B genome tended to downregulate the expression of key genes during meiosis and mitosis, while A genome tended to downregulate the expression of genes related to stress and pollen wall formation. The results showed that the development of male gametophyte was seriously affected after synthesis.
2023-01-06 | GSE193368 | GEO
Project description:Oocytes develop the competence for meiosis and early embryogenesis during their growth. Setdb1 is a histone H3 lysine 9 (H3K9) methyltransferase required for post-implantation development and has been implicated in the transcriptional silencing of genes and endogenous retroviral elements (ERVs). To address its role in oogenesis and pre-implantation development, we conditionally deleted Setdb1 in growing oocytes. Loss of Setdb1 expression greatly impaired meiosis. It delayed meiotic resumption, altered the dynamics of chromatin condensation, and impaired kinetochore-spindle interactions, bipolar spindle organization, and chromosome segregation in more mature oocytes. The observed phenotypes related to changes in abundance of specific transcripts in mutant oocytes. Setdb1 maternally deficient embryos arrested during pre-implantation development and showed comparable defects during cell cycle progression and in chromosome segregation. Finally, transcriptional profiling data indicate that Setdb1 down-regulates rather than silences expression of ERVK and ERVL-MaLR retrotransposons and associated chimearic transcripts during oogenesis. Our results identify Setdb1 as a novel meiotic and embryonic competence factor in meiosis and mitosis, safeguarding genome integrity at the onset of life.
2016-06-27 | GSE82002 | GEO
Project description:A successful mitosis-to-meiosis transition in germ cells is essential for fertility in sexually reproducing organisms. In mice and humans, it is established that STRA8 expression is critical for meiotic onset in both sexes. Here we show that BMP signalling is also essential, not for STRA8 induction but for correct meiotic progression in mouse fetal ovarian germ cells. Germ cell-specific deletion of Bmpr1a caused aberrant expression of meiotic, pluripotency, and cell cycle genes in E14.5 mouse fetal ovaries. Our results verify a role for BMP signalling in instructing germ cell meiosis in female mice in vivo, and shed light on the regulatory mechanisms underlying fetal germ cell development.
2025-01-16 | GSE268565 | GEO