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ame-mir-9a: ame-mir-9a is a microRNA (miRNA) that has been identified as a key factor in the caste determination of the honeybee Apis mellifera, as well as in the development of males in bumblebees [PMC3562263][PMC7785045]. Although it is not differentially expressed between queen- and worker-destined larvae in Bombus terrestris, it shows caste-biased expression levels in A. mellifera, with higher levels found in worker thorax and abdomen compared to queen tissues [PMC5374498][PMC2394756]. Interestingly, during the pupal stage of queens, higher levels of mir-9a are observed [PMC2394756]. The expression patterns suggest that ame-mir-9a may play a significant role in determining the physical differences between honeybee castes [PMC2394756]. Furthermore, ame-mir-9a has been validated through RT-PCR to be more strongly expressed in worker abdomens when compared to other candidate loci [PMC2394756]. In addition to its role in caste differentiation, ame-mir-9a is also implicated in sex differentiation with higher expression levels found in males than females [PMC6835379]. This evidence collectively points towards ame-mir-9a's involvement not only in caste determination but also potentially influencing sexual development within hymenopteran species.
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