rno-mir-222: rno-mir-222 is a microRNA (miRNA) that has been found to be highly abundant in dihydrotestosterone (DHT)-treated rat ovaries, indicating a potential role in ovarian function or disorders [PMC3682887]. This miRNA, along with others such as rno-miR-221 and rno-miR-25, has been identified as differentially expressed in the theca of cystic follicles exclusively, suggesting a specific localization and function within ovarian tissue [PMC3682887]. Furthermore, rno-mir-222 has been associated with pathological conditions such as cardiac hypertrophy, as it is among several miRNAs identified in microRNA profiling studies related to this cardiac condition [PMC5856749]. Predictive studies have suggested that rno-mir-222 may target genes such as Acadm, indicating its involvement in metabolic pathways within the rat model [PMC6377737]. The generation of miR-222–/– rats through CRISPR technology has facilitated the study of this miRNA's function by allowing researchers to observe the effects of its absence on gene expression and phenotype [PMC8626841]. Lastly, differential expression of rno-miR-222 has been reported in rats with polycystic ovary syndrome (PCOS) compared to controls, highlighting its potential role in this endocrine disorder [PMC4838149].