Analysis of a Human Transfer RNA Gene Cluster and Characterization of the Transcription Unit and Two Processed Pseudogenes of Chimpanzee Triosephosphate Isomerase Page: 88
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88
nonselected human and chimpanzee DNAs (Chang and Slightom,
1984; Willard et al., 1985).
The process of retroposition appears to be a
relatively recent development on the evolutionary time
scale. The reason for fixation of retropseudogenes in
eukaryotic genomes is uncertain. The most likely
explanation is that the resulting variations due to
retroposition provides for evolutionary change by creating
new material for positive or negative selection, as well as
neutral drift. Processed pseudogenes, with few exceptions,
have been found only in mammals, and appear to be a common
phenomenon with housekeeping genes which exhibit germ-line
expression. SINEs and LINEs, which also appear to be the
result of retroposition, have apparently developed
concurrently. The Alu family member, the LI element, the
MER elements, the solitary LTR, and the two processed
pseudogenes described above are the products of different
retroposition events in the chimpanzee genome. Even though
many of the details of retroposition are poorly understood
at this time, it is apparent that numerous retroposition
events have occurred in these two different segments of the
chimpanzee genome, and undoubtedly were the significant
events in the divergence of these two genomic regions.
The Elusive Origin of the Hominoid TPI-2 Polypeptide
Two basic genetic models have previously been proposed
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Craig, Leonard C. (Leonard Callaway). Analysis of a Human Transfer RNA Gene Cluster and Characterization of the Transcription Unit and Two Processed Pseudogenes of Chimpanzee Triosephosphate Isomerase, dissertation, August 1990; Denton, Texas. (https://digital.library.unt.edu/ark:/67531/metadc331579/m1/94/: accessed July 18, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; .