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MicroRNA and Rare Human Diseases
Himanshu Goel1,2, Amy Goel3
1Hunter Genetics, Waratah, NSW 2298, Australia.
Background:
The role of microRNAs (miRNAs) in the pathogenesis of rare genetic disorders has been gradually discovered. MiRNAs, a class of small non-coding RNAs, regulate gene expression by silencing target messenger RNAs (mRNAs). Their biogenesis involves transcription into primary miRNA (pri-miRNA), processing by the DROSHA-DGCR8 (DiGeorge syndrome critical region 8) complex, exportation to the cytoplasm, and further processing by DICER to generate mature miRNAs. These mature miRNAs are incorporated into the RNA-induced silencing complex (RISC), where they modulate gene expression.
Methods/Results:
The dysregulation of miRNAs is implicated in various Mendelian disorders and familial diseases, including DICER1 syndrome, neurodevelopmental disorders (NDDs), and conditions linked to mutations in miRNA-binding sites. We summarized a few mechanisms how miRNA processing and regulation abnormalities lead to rare genetic disorders. Examples of such genetic diseases include hearing loss associated with MIR96 mutations, eye disorders linked to MIR184 mutations, and skeletal dysplasia involving MIR140 mutations.
Conclusions:
Understanding these molecular mechanisms is crucial, as miRNA dysregulation is a key factor in the pathogenesis of these conditions, offering significant potential for the diagnosis and potential therapeutic intervention.
Insights
MicroRNAs (miRNAs) are key players in rare genetic disorders. Dysregulation of these small non-coding RNAs contributes to diseases like DICER1 syndrome and neurodevelopmental disorders, offering diagnostic and therapeutic potential.
Area of Science:
- Molecular Biology
- Genetics
- RNA Biology
Background:
- MicroRNAs (miRNAs) are small non-coding RNAs regulating gene expression by targeting messenger RNAs (mRNAs).
- miRNA biogenesis involves transcription, processing by DROSHA-DGCR8 and DICER, and RISC complex incorporation.
- Dysregulation of miRNAs is increasingly recognized in the pathogenesis of rare genetic disorders.
Purpose of the Study:
- To elucidate the role of microRNA dysregulation in rare genetic disorders.
- To summarize mechanisms linking miRNA processing and regulation abnormalities to disease.
- To highlight the diagnostic and therapeutic potential of understanding miRNA involvement.
Main Methods:
- Literature review and synthesis of mechanisms.
- Analysis of genetic disorders associated with miRNA mutations or dysregulation.
- Case examples illustrating miRNA roles in specific diseases.
Main Results:
- miRNA dysregulation is implicated in Mendelian and familial diseases, including DICER1 syndrome and neurodevelopmental disorders (NDDs).
- Mutations in miRNA genes (e.g., MIR96, MIR184, MIR140) are linked to specific conditions like hearing loss, eye disorders, and skeletal dysplasia.
- Abnormalities in miRNA processing and regulation contribute to the pathogenesis of rare genetic disorders.
Conclusions:
- Understanding miRNA molecular mechanisms is crucial for rare genetic disorders.
- miRNA dysregulation is a key pathogenic factor.
- These insights hold significant potential for diagnosis and therapeutic interventions in rare genetic diseases.
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