Transmission of TEs

TEs generally demonstrate vertical transmission, meaning that new incorporations are inheritable by offspring. Although transposons may excise from their genomic location and integrate elsewhere, retrotransposons form stable integrations, creating a molecular "fossil record" of past integration events.

Over 99 percent of human Alu elements are shared with the chimpanzee genome. Unlike Alu, L1 predates the origin of primates, with many

Figure 2. Transmission of transposable elements (TEs). Vertical transmission involves a germ-line TE integration (indicated by the X in the sperm), that is passed on to the next generation. Horizontal transmission involves the transfer of a TE (indicated by the X) across species, possibly via a parasite.

Figure 2. Transmission of transposable elements (TEs). Vertical transmission involves a germ-line TE integration (indicated by the X in the sperm), that is passed on to the next generation. Horizontal transmission involves the transfer of a TE (indicated by the X) across species, possibly via a parasite.

base pairs two nucleotides (either DNA or RNA) linked by weak bonds open reading frames

DNA sequences that can be translated into mRNA; from start

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