Obp4 and Act5C gene expression is related to Hygienic behavior in honeybee families


Hygienic Behavior
gene expression


Honeybees (Apis mellifera) evolved social immunity mechanisms based on coordinated behavioral mechanisms for reducing the spread of pathogens and parasites. In particular, Hygienic Behavior (HB) is an actively participation of family defense by uncapping and removal of dead, diseased or parasitized brood. Currently, HB evaluation is performed only by in-field empirical assays, and suitable molecular markers that could allow the discrimination between families with High and Non-High HB score are not yet available. The research activity was characterized by a transversal approach: from in-field phenotypic characterization, to expression profiling of selected coding genes in honeybee brains. The expression analysis was performed on pools of 15 days-old honeybees collected in spring 2017 from 10 different colonies (5 with high HB and 5 with low HB scores). The brains were dissected and total RNA was purified. After quantitation and quality evaluation, the extracted RNAs were reverse transcribed to cDNAs and Real Time PCR was performed on different target genes (Act5C, Mblk-1, Obp3, Obp4, Obp16 and Obp18) previously showed by transcriptomic and proteomic studies to be involved in HB. The comparative analysis of RT-PCR threshold cycles (Ct) showed that Mblk-1 was the least expressed gene among the analyzed targets. Most importantly, statistical analysis of expression data validated (p<0.05) the delta-Ct between Obp4 and Act5C as a predictive index of high vs low HB score. These results confirmed the findings obtained through a preliminary experiment performed in spring 2016.


Chandrasekaran S., Amentb, S. A., Eddyc, J. A., Rodriguez-Zasd S. L., Schatzb, B. R., Pricea, N. D., Robinsonb, G. E., 2011. Behavior-specific changes in transcriptional modules lead to distinct and predictable neurogenomic states.. Proceedings of the National Academy of Sciences 108: 18020-18025.

Cremer, S., Armitage, S. A. O., Schmid-Hempel, P., 2007. Social Immunity. Social immunity. Current Biology 17: R693–R702.

Cristino, A. S., Barchuk, A. R., Freitas, F. C. P., Narayanan, R. K., Biergans, S. D., Zhao, Z., Simoes, Z. L. P., Reinhard, J., Claudianos, C., 2014. Neuroligin-associated microRNA-932 targets actin and regulates memory in the honeybee. Nature Comumunications 5:5529.

Takeuchi, H., Kage†, E., Sawata, M., Kamikouchi, A., Ohashi, K., Ohara, M., Fujiyuki, T., Kunieda, T., Sekimizu, T., Natori, .S., Kubo, T.,2001. Blackwell Science Ltd Identification of a novel gene, Mblk-1, that encodes a putative transcription factor expressed preferentially in the large-type Kenyon cells of the honeybee brain. Insect Molecular Biology. 10: 487-494.

Dell’Orco, F., Facchini, E., Cilia, G., Rizzi, R., Mortarino, M., 2016. Candidate molecular markers of hygienic behaviour in honeybees (apis mellifera): an expression study. International Journal of Health, Animal Science & Food Safety, Vol. 2s, Proceedings of the Veterinary and Animal Science Days, 8-10 June 2016

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