It's my understanding that through the process of class switch recombination, loci fragments are lost in the plasma cell's genome. Does this mean that reversion to a prior isotype cannot be achieved and that isotype switching is always a linear progression within the differentiated cell?
"While class switch recombination is mostly a deletional process, rearranging a chromosome in "cis", it can also occur (in 10 to 20% of cases, depending upon the Ig class) as an inter-chromosomal translocation mixing immunoglobulin heavy chain genes from both alleles." (https://www.wikiwand.com/en/Immunoglobulin_class_switching)
I further understand that the deletional process utilizes NHEJ. Could this trans acting translocation accomplish restorative function of a prior isotype?
Thanks
