Clustering of multiple transgene integrations in highly-unstable Ascobolus immersus transformants.
A large proportion of Ascobolus immersus transformants are highly unstable in crosses: the phenotype conferred by the transgene is not transmitted to the progeny, irrespective of the endogenous or foreign origin of the transgene. They all have integrated multiple transgene copies, clustered at a single chromosomal site or at tightly-linked sites. Clustered non-homologous integrations are always rearranged. Yet they never escape the "methylation induced premeiotically" (MIP) process. This always results in gene silencing, even when the transgene is partially repeated, accounting for the high instability of these transformants.
Rhounim
L
L
Institut de Génétique et Microbiologie, CNRS URA 1354, Université Paris-Sud, Orsay, France.
Grégoire
A
A
Salama
S
S
Faugeron
G
G
D001203:Ascomycota / Q000235:genetics*; D003433:Crosses, Genetic; D004271:DNA, Fungal / Q000235:genetics; D005800:Genes, Fungal; D005810:Multigene Family; D010641:Phenotype; D010957:Plasmids / Q000235:genetics; D012091:Repetitive Sequences, Nucleic Acid; D015183:Restriction Mapping; D014170:Transformation, Genetic
D004271:DNA, Fungal