Direct transfer of plant genes from chloroplasts into the cell nucleus: Gene function p... - 0 views
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Chloroplasts, the plant cell's green solar power generators, were once living beings in their own right.
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This changed about one billion years ago, when they were swallowed up but not digested by larger cells.
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either direct transport in the form of DNA fragments from the chloroplasts to the nucleus or transport in the form of mRNA, which is then transcribed back into DNA.
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Since the introns obstruct protein synthesis, they need to be removed from the mRNA, a procedure described as splicing.
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t is thought that the introns even help the splicing enzymes by folding themselves into stable RNA structures, thus directing the enzymes to the right locations.
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It was found that the transfer takes place without the involvement of RNA and that the DNA apparently jumps directly from the cell's chloroplasts into its nucleus.
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