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Published on: November 24, 2010
Correction of a genetically caused enzyme defect by somatic cell hybridization
Mouse chromosome 7 deletions disrupt liver-specific traits like glucose-6-phosphatase (Glc-6-Pase) activity. Hybridization experiments reveal the Glc-6-Pase structural gene is not deleted, but regulatory genes on chromosome 7 are likely responsible for expression failure.
Area of Science:
- Genetics
- Molecular Biology
- Biochemistry
Background:
- Deletions in mouse chromosome 7 cause loss of liver-specific traits, including glucose-6-phosphatase (Glc-6-Pase) activity.
- Previous research suggested these deletions might encompass regulatory genes controlling liver-specific enzyme expression.
- The precise genetic basis for Glc-6-Pase deficiency in deletion homozygotes remained unclear.
Purpose of the Study:
- To determine if the Glc-6-Pase structural gene is located within the deleted region of chromosome 7.
- To investigate the genetic mechanism underlying the loss of Glc-6-Pase activity in homozygous deletion mice.
- To map the structural genes for Glc-6-Pase and tyrosine aminotransferase (TyrATase).
Main Methods:
- Hybridization of mouse liver cells (homozygous for deletion c14CoS) with rat hepatoma cells (2S Faza).
- Analysis of Glc-6-Pase activity in hybrid cell cultures to assess gene expression.
- Chromosomal mapping using glucose-6-phosphate isomerase (Glc-6-PIase) as a marker for chromosome 7.
Main Results:
- Hybrid cells expressed mouse Glc-6-Pase activity, confirming the structural gene is not within the c14CoS deletion.
- Rat hepatoma genome provided a factor activating mouse Glc-6-Pase expression, suggesting a deleted regulatory gene.
- Glc-6-Pase and TyrATase structural genes map to different chromosomes, and Glc-6-PIase excludes chromosome 7 for Glc-6-Pase.
Conclusions:
- The structural gene for Glc-6-Pase is not located on the deleted segment of mouse chromosome 7.
- The observed deficiency in Glc-6-Pase activity is likely due to the deletion of regulatory or processing genes on chromosome 7.
- The deleted region on mouse chromosome 7 contains regulatory genes controlling the expression of multiple liver-specific traits encoded by genes on different chromosomes.
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