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Alternative name: L1Base2

Contains putatively active LINE-1 insertions residing in human and rodent genomes: intact in the two open reading frames (ORFs), full length L1s (FLI-L1s) and b) L1s with intact ORF2 but disrupted ORF1 (ORF2-L1s). L1Base includes the full-length (>6000 bp) non-intact L1s (FLnI-L1s). L1Base can be searched via the MySQL-driven query system by using criteria, such as conservation of the functional sites important for activity, chromosomal localization and families. The database can also be searched by executing Blastn-based queries with a user-specified L1 sequence.

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L1Base classification

  • Animals
    • Homo sapiens
    • Mus musculus
    • Rattus norvegicus

L1Base specifications

Restrictions to use:
Community driven:
User data submission:
Not allowed
Database management system:
Data access:


  • L1Xplorer

L1Base support


  • Tomasz Zemojtel <>


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Department of Computational Molecular Biology, Max-Planck-Institute for Molecular Genetics, Berlin, Germany; Department of Bioinformatics, University of Wuerzburg, Am Hubland, Wuerzburg, Germany

Funding source(s)

This work has been a part of BioSapiens project funded by the European Commission within its FP6 Programme, under the thematic area ‘Life sciences, genomics and biotechnology for health’, contract number LHSG-CT-2003-503265.

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