Add time:09/05/2019         Source:sciencedirect.com

Genomic Southern blot analysis of rat EFIA (gene encoding enhancer factor I subunit A) reveals a complex band pattern when cDNA subfragment probes are used. Screening a rat genomic library with a rat EFIA cDNA probe yields two different processed EFIA pseudogenes, designated rat ΨEFIA#(23) and #(47), in addition to two other dif but less extensively characterized clones. ΨEFIA#(47) has no open reading frame (ORF) sequences. ΨEFIA#(23) contains two ORFs (83 and 178 codons), the products of which (if expressed) might be negative-acting EFIA transcription factors. Located nearly 0.6kb upstream from ΨEFIA#(23) is a perfect 69-bp dinucleotide (CT) tandem repeat, a sequence element associated with other isolated pseudogenes. Additionally, the 3′ end of this processed gene is interrupted by an unusual retroposon, an inverted dimeric B J-like short interspersed repetitive element (SINE). The isolation of several independent clones of the same EFIA processed pseudogenes indicates that they comprise a significant component of the rat EFIA copy multiplicity. The phenomenon of repeat induced point mutagenesis (ripping) at rat EFIA pseudogene CpG doublets occurs at a frequency at least 6.5 times higher than predicted from random mutagenesis. This is consonant with the proposal that ripping may be the mechanism which inactivates the ectopic recombination potential of the rat EFIA pseudogenes.

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