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Dosage Compensation in Drosophila: Its Canonical and Non-Canonical Mechanisms
Yuri Y Shevelyov1, Sergey V Ulianov2,3, Mikhail S Gelfand4,5
1Institute of Molecular Genetics of National Research Centre "Kurchatov Institute", Moscow 123182, Russia.
Abstract:
Dosage compensation equalizes gene expression in a single male X chromosome with that in the pairs of autosomes and female X chromosomes. In the fruit fly Drosophila, canonical dosage compensation is implemented by the male-specific lethal (MSL) complex functioning in all male somatic cells. This complex contains acetyl transferase males absent on the first (MOF), which performs H4K16 hyperacetylation specifically in the male X chromosome, thus facilitating transcription of the X-linked genes. However, accumulating evidence points to an existence of additional, non-canonical dosage compensation mechanisms operating in somatic and germline cells. In this review, we discuss current advances in the understanding of both canonical and non-canonical mechanisms of dosage compensation in Drosophila.
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