Mice with inactivation of both genes resemble mice with only Grb10 inactive.
By making mice with only one or a few suspect mutations at a time, scientists cut through the chaotic genetic noise.
The Lyon hypothesis also accounted for the findings that one copy of the X-chromosome in female cells was highly condensed, and that mice with only one copy of the X-chromosome developed as infertile females – but which X-chromosome is inactivated is random and varies from cell to cell.
It's especially striking, he says, that mice with only one defective copy of Mus81 get cancer.
CK14 was differentially expressed in newborn and adult mice, with only rare cells in the adult basal cell layer.
And mice with only one of the two gene copies inactivated had milder symptoms than the complete knock-outs.
The new mice exhibit five to 10 times as many tangles as mice with only the tau mutation, the team reports in the 24 August issue of Science, suggesting that the amyloid b deposits somehow spur on the development of tangles.
Researchers at the John A. Burns School of Medicine, University of Hawaii have shown that male mice with only two genes from the Y chromosome can successfully produce offspring.
We previously reported some reduced fertility in male mice with only preliminary investigation in female mice [13].
As Rad21 is an essential gene and Rad21−/− embryos die very early in development, we investigated mice with only one mutant allele.
Similarly, hepatic expression of all 4 miRNAs was also intermediate between control and hyperthyroid mice with only miR206 being significantly reduced relative to control animals (Fig 2B).
