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Drosha – Function, Significance & Disease

Drosha is a ribonuclease that plays a central role in microRNA biogenesis, regulating gene expression in human cells and influencing development and disease.

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Things worth knowing about "Drosha"

Drosha is a ribonuclease that plays a central role in microRNA biogenesis, regulating gene expression in human cells and influencing development and disease.

What is Drosha?

Drosha is an enzyme belonging to the RNase III family of ribonucleases, found in the nucleus of eukaryotic cells. It is a key component of the Microprocessor complex and is essential for the production of microRNAs (miRNAs) — small, non-coding RNA molecules that regulate gene expression. The human gene encoding this enzyme is officially designated DROSHA and is located on chromosome 5.

Mechanism of Action

The biosynthesis of microRNAs begins in the cell nucleus. Here, primary microRNA (pri-miRNA) is first transcribed from DNA. Drosha, together with its cofactor DGCR8 (DiGeorge Syndrome Critical Region Gene 8), recognizes specific hairpin structures within the pri-miRNA and cleaves them precisely to generate the precursor miRNA (pre-miRNA).

The pre-miRNA is then exported from the nucleus to the cytoplasm via the protein Exportin-5.
In the cytoplasm, it is further processed by the enzyme Dicer, which converts it into the mature, double-stranded miRNA.
The mature miRNA is incorporated into the RISC complex (RNA-induced silencing complex), where it regulates target gene expression by binding to complementary mRNA sequences.

Drosha therefore catalyzes the first and most critical processing step in canonical miRNA biogenesis.

Biological Significance

Because microRNAs can simultaneously regulate the expression of hundreds to thousands of genes, Drosha holds far-reaching biological importance as a key enzyme:

Cell proliferation and differentiation: Drosha controls miRNAs that govern cell growth and specialization.
Apoptosis: Certain Drosha-generated miRNAs regulate programmed cell death.
Embryonic development: Drosha is essential for normal embryogenesis.
Immune system: It influences the maturation and function of immune cells.

Drosha and Disease

Dysfunctions or alterations in the Drosha gene or enzyme have been associated with a range of diseases:

Cancer

Alterations in Drosha activity have been described in various cancers. Disrupted Drosha expression leads to impaired miRNA biogenesis, which can promote uncontrolled cell growth. Mutations in the DROSHA gene have been identified in nephroblastoma (Wilms tumor), certain ovarian tumors, and other solid tumors.

Neurological Disorders

Since miRNAs play an important regulatory role in the nervous system, Drosha dysfunction has also been linked to the pathogenesis of neurological conditions, including certain neurodegenerative diseases.

Viral Infections

Some viruses, including HIV and certain herpesviruses, interact with the Drosha Microprocessor complex in order to exploit or evade the cellular miRNA machinery for their own replication.

Clinical and Therapeutic Relevance

Drosha is considered a promising target in biomedical research. Approaches aimed at targeted modulation of Drosha activity could open up new therapeutic opportunities in the future, particularly in oncology and antiviral therapy. Furthermore, Drosha is being investigated as a potential biomarker for certain cancers, as its altered expression can be detected in tumor tissues.

References

Lee, Y. et al. (2003). The nuclear RNase III Drosha initiates microRNA processing. Nature, 425(6956), 415–419.
Gregory, R. I. et al. (2004). The Microprocessor complex mediates the genesis of microRNAs. Nature, 432(7014), 235–240.
Torrezan, G. T. et al. (2014). Recurrent somatic mutation in DROSHA and DICER1 in Wilms tumour. Nature Genetics, 46(5), 437–439.

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