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oar-mir-133: Oar-mir-133 is a cardiac-specific microRNA (miRNA) identified as a key regulator in sheep heart, with a one nucleotide (nt) difference from its human, mouse, and rat counterparts [PMC5557765]. It is the most abundant cardiac-specific miRNA in the sheep heart and is considered a hub miRNA for its predicted regulatory role on the gene MAPK14 [PMC5831392]. Unlike its counterparts in other species, oar-mir-133 is the predominant form found in sheep heart tissue, with other forms such as hsa-/mmu-/rno-miR-133a-3p and -5p and hsa-/mmu-/rno-miR-133b present in much lower counts [PMC5557765]. It is also noteworthy that oar-mir-133 is currently the only cardiac-specific miRNA listed for sheep in miRBase 21 [PMC5557765]. Next-generation sequencing (NGS) techniques have detected high counts of oar-mir-133, highlighting its significant expression level [PMC5557765]. Additionally, oar-mir-133 has been found to be differentially expressed in both hypothalamic and uterine libraries of sheep [PMC8131964], suggesting its involvement in multiple physiological processes. It has been proposed to have a trans relationship with oar_circ_0007178 and may regulate genes such as IGF2 among others [PMC9464909], indicating its potential role in diverse biological pathways.
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