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Seasonal regulation of the lncRNA LDAIR modulates self-protective behaviours during the breeding season

ABSTRACT: Seasonal regulation of the lncRNA LDAIR modulates self-protective behaviours during the breeding season

PROVIDER: PRJNA490646 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR7825640_1.fastq.gz	Fastqsanger.gz
	SRR7825640_2.fastq.gz	Fastqsanger.gz
	SRR7825641_1.fastq.gz	Fastqsanger.gz
	SRR7825641_2.fastq.gz	Fastqsanger.gz
	SRR7825642_1.fastq.gz	Fastqsanger.gz

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Project description:Ovarian follicular fluid (FF) comprises a dynamic milieu whose composition alters under seasonal variation, influencing follicle development and oocyte developmental competence. Various cell subtypes (e.g. granulosa, theca, and cumulus) produce cell-secreted nanoparticles, coined extracellular vesicles (EVs), which contain bioactive regulatory molecules such as microRNAs (miRNAs) known to mediate intrafollicular communication through various forms of signaling and information transfer. Markedly, the hallmark feature of EVs transferring cellular knowledge propagates their appealing nature as direct indicators of cellular status, albeit homeostasis, dysfunction, or disease. Photoperiod alterations influencing the regulatory content of FF-EVs as downstream modifiers remain largely unknown, particularly in seasonal breeding animals. Here, we aimed to unpack the impacts of seasonal variation on the miRNA expression profiles of FF-EVs in the mare. Equine pre-ovulatory follicles were monitored and aspirated using ultrasound-guided transvaginal techniques to obtain follicular fluids during non-breeding (spring anovulatory, SAN) and breeding seasons (spring ovulatory, SOV; summer, SUM; and fall ovulatory, FOV). 97 miRNAs were found to be differentially expressed between groups. Pairwise comparisons revealed specific clusters, including six miRNAs involved in the spring transition (miR-149-200b-206-221-328-615) and many others dysregulated during that of the summer (miR-143-192451- 302b-100, and let 7c), the peak time point for breeding. Bioinformatic analyses led to unveiling significant enrichments in various biological functions, such as transcription factor activity, transcription and transcription regulation, nucleic acid binding, sequence-specific DNA binding, p53 signaling, and post-translational modifications. Ultimately, the miRNA content of seasonally divergent FF-EVs poses as potentially relevant indicators of intrafollicular mechanisms directing seasonal transitions and their functional regulatory roles in the pre-ovulatory stage, governing subsequent ovulation.

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Seasonal regulation of the lncRNA LDAIR modulates self-protective behaviours during the breeding season

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