Active human retrotransposons: variation and disease.

Area of Science:

• Genetics
• Molecular Biology
• Genomics

Background:

• Mobile DNAs, or transposons, are abundant in the human genome (approx. 45%).
• Transposons are classified into DNA or RNA intermediates.
• Non-LTR retrotransposons, including Long INterspersed Element-1 (LINE-1), are the only active class in humans, linked to 96 diseases.

Purpose of the Study:

• To summarize recent findings on human LINE-1 retrotransposition.
• To elucidate the role of LINE-1 in human disease.
• To explore the historical and current activity of LINE-1 and its contribution to genetic variation.

Main Methods:

• Review of recent scientific literature on LINE-1 retrotransposition.
• Analysis of studies investigating LINE-1's role in disease pathogenesis.
• Examination of research on the spatio-temporal activity of LINE-1.

Main Results:

• LINE-1 elements are autonomous, capable of retrotransposing their own RNA and other RNA molecules (Alu, SVA, U6) via reverse transcriptase.
• LINE-1 can also retrotranspose cellular mRNAs, leading to processed pseudogene formation.
• Recent research provides updated insights into human LINE-1 activity, disease association, and genomic distribution.

Conclusions:

• LINE-1 retrotransposition is an ongoing process in the human genome with significant implications for genetic variation and disease.
• Understanding the dynamics of LINE-1 activity is crucial for comprehending genome evolution and human health.
• Further research is needed to fully elucidate the mechanisms and consequences of LINE-1 retrotransposition.