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A patchwork interspersed sequence is present in a high copy number in the sheep genome
L D'Aiuto1, P Barsanti, I Cserpan
1Dipartimento di Anatomia Patologica e di Genetica, University of Bari, via Amendola 165/A, Italy.
Gene
|February 1, 2003
Summary
Researchers identified a novel interspersed DNA sequence, 3.79 AS1, in sheep genomes. This sequence, likely a Bov B LINE subfamily, amplified massively and dispersed throughout the ovine genome.
Area of Science:
- Genomics
- Molecular Biology
- Bioinformatics
Background:
- Repetitive DNA sequences play crucial roles in genome evolution and function.
- Understanding the origin and amplification of interspersed elements is key to deciphering genome plasticity.
Purpose of the Study:
- To characterize a newly discovered interspersed DNA sequence in the ovine genome.
- To investigate the structural features and genomic distribution of the 3.79 AS1 sequence.
Main Methods:
- Isolation and characterization of the 3.79 AS1 sequence.
- Bioinformatic analysis to identify homologies and functional motifs.
- Fluorescent in situ hybridization (FISH) to determine genomic localization.
Main Results:
- A novel interspersed sequence, 3.79 AS1, was identified in high copy number in the ovine genome.
- 3.79 AS1 shares similarities with reverse transcriptase, art2, amplification promoting sequences (APS), and an origin of bidirectional DNA replication (OBR).
- FISH analysis revealed widespread distribution of 3.79 AS1 across sheep chromosomes, excluding the Y chromosome.
Conclusions:
- The 3.79 AS1 sequence is likely a subfamily of Bov B LINE, predating Bovidae species divergence.
- Its structural features facilitated massive amplification and dispersion within the ovine genome.
- This finding contributes to understanding the dynamics of repetitive elements in mammalian genomes.