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Chromosomal localization and sequence analysis of a human episomal sequence with in vitro differentiating activity
C Boccaccio1, F Apiou, J Deschatrette
1INSERM U347, Le Kremlin-Bicêtre, France.
Somatic Cell and Molecular Genetics
|May 1, 1994
Summary
Researchers mapped the human activator of liver function gene to chromosome 12q24.2-12q24.3, finding it near the hepatic nuclear factor 1 (HNF1) gene. The gene-rich fragment contains multiple retroposons, including Alu repeats.
Area of Science:
- Genomics
- Molecular Biology
- Human Genetics
Background:
- The human activator of liver function (hALF) was identified as an episome inducing differentiation in rat hepatoma cells.
- Understanding the genomic location and structure of hALF is crucial for its functional characterization.
Purpose of the Study:
- To map the genomic location of the human activator of liver function.
- To investigate the sequence and genomic context of the hALF episome.
Main Methods:
- In situ hybridization was used to determine the chromosomal location of hALF.
- DNA sequencing was performed on the integrated form of the episome and its flanking regions.
Main Results:
- The hALF gene was mapped to human chromosome 12q24.2-12q24.3.
- This location is identical to the gene for the hepatic transcription factor HNF1.
- The episomal sequence is rich in retroposons, including a ribosomal protein L21 pseudogene, an L1Hs sequence, and 10 Alu repeats.
Conclusions:
- The human activator of liver function resides on chromosome 12q24.2-12q24.3, adjacent to the HNF1 gene.
- The presence of numerous retroposons suggests a complex integration history and potential regulatory elements.