Multiple somatic cells, including blood cells (Giorgetti et al., 2009), fibroblasts (Takahashi et al., 2007) and hair follicle dermal papilla cells (Tsai et al., 2011) have been successfully reprogrammed to IPSCs.
In aposporic gametogenesis, one or multiple somatic cells belonging to the ovule nucellus change their fate by dividing mitotically and developing functionally unreduced embryo sacs by mimicking sexual gametogenesis.
We observe widespread off-target activity of dCas9-methyltransferases, which occurres independently of the presence of single guide RNAs (sgRNAs) and was also apparent across multiple somatic cell types.
The epigenetic modifications and/or information are propagated transgenerationally to daughter cells through multiple somatic cell divisions (figure 1).
We choose this system as it is successfully applied by others (Zhu et al, 2009; Yilmaz et al, 2012), allows for transgene induction in multiple somatic cell types (Carey et al, 2010) and is compatible with a vector system for doxycycline-regulated, fluorescence-linked shRNAs (McJunkin et al, 2011; Premsrirut et al, 2011; Dow et al, 2012).
Our experimental system involves the transplantation of multiple mammalian somatic cell nuclei into the germinal vesicle (GV) of the Xenopus oocytes in first meiotic prophase.
We detected varied allele fractions of the pSNMs among multiple samples obtained from the same individuals, including blood, saliva, hair follicle, buccal mucosa, urine, and semen samples, indicating that pSNMs could affect multiple sources of somatic cells as well as germ cells.
We observed the same pattern in the human data, although in this case the multiple somatic origins of the cell lines of origin contribute to the higher level of variation.
IAP elements appear to be repressed by DNA methylation in multiple embryo-derived cell types (11, 30, 31) and is one of the hypomethylation-sensitive genes strongly activated in mouse somatic cells in multiple models of DNA hypomethylation (17).
These cells can be haematopoietic or can differentiate into somatic cells in multiple organs, and are found in both healthy individuals and those with autoimmune diseases.
This would require multiple types of restoration, as somatic cells accumulate nuclear and mitochondrial mutations as well as damaged macromolecules with age.
