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Ectopic expression of beta-lactoglobulin transgenes
1Roslin Institute (Edinburgh), Midlothian, UK.
Molecular & General Genetics : MGG
|March 20, 1995
Summary
Transgenic mice expressing the ovine beta-lactoglobulin gene showed mammary gland-specific expression. However, some lines exhibited unintended, low-level expression in other tissues, indicating a lack of full insulation.
Area of Science:
- Genetics
- Molecular Biology
- Transgenic Animal Models
Background:
- Ovine beta-lactoglobulin (BLG) gene constructs are used in transgenic mice.
- Mammary gland-specific expression is desired for BLG transgenes.
Purpose of the Study:
- To investigate the expression patterns of ovine BLG transgenes in transgenic mice.
- To determine if mammary gland-specific expression is position-independent and if ectopic expression occurs.
Main Methods:
- Generation of transgenic mice carrying ovine BLG genomic constructs.
- Analysis of transgene expression in various tissues (mammary gland and others).
- Comparison of expression patterns across different transgenic lines.
Main Results:
- Position-independent expression of BLG was achieved in the mammary gland.
- Constitutive, low-level ectopic expression was detected in other tissues in a proportion of lines (40%).
- Ectopic expression patterns differed temporally from mammary gland expression and were position-dependent.
Conclusions:
- The DNA elements ensuring mammary gland-specific BLG expression do not fully insulate transgenes from position effects in other tissues.
- The frequency and constitutive nature of ectopic expression suggest non-random transgene integration.