Transcripts of the transposon mariner are present in epileptic brain

Area of Science:

• Genetics
• Neuroscience
• Molecular Biology

Background:

• Mobile genetic elements, specifically transposons, are increasingly recognized for their role in human diseases.
• The mariner transposon is a small element found in non-vertebrate genomes, known to cause mutations through replication, excision, and insertion without an RNA intermediate.

Purpose of the Study:

• To investigate the presence and potential role of the mariner transposon in human DNA and its association with epilepsy.
• To analyze the expression of mariner transcripts in human brain tissue, particularly in cases of epilepsy.

Main Methods:

• Analysis of human DNA for mariner gene copies.
• Detection and quantification of mariner-specific RNA in hippocampal tissue from epileptic and non-epileptic individuals using RNA extraction and analysis.
• Rapid amplification of cDNA ends (RACE) to obtain a complete mariner transcript sequence.

Main Results:

• Approximately 60 copies of the mariner gene were identified in human DNA.
• Mariner transcripts were abundant in sclerotic epileptic hippocampi but typically absent in non-sclerotic hippocampi.
• A complete, though non-functional, human mariner transcript was sequenced, showing homology to a functional Drosophila counterpart.

Conclusions:

• Differential expression of mariner transcripts in sclerotic hippocampi suggests potential activity of this mobile genetic element.
• The activity of the mariner element may contribute to epileptogenesis by mutating critical genes within the hippocampus.
• Further research is warranted to understand the precise mechanisms by which mariner transposons may influence neurological disorders like epilepsy.