To address whether the observed sequence differences in the 30 UTR of Cyp12d1-d and Cyp12d1-p translate into
expression differences, we measured the absolute levels of
Cyp12d1-d and Cyp12d1-d transcript’s abundance in the reference
strain y; cn bw sp.We found significant differences in
basal expression levels, where Cyp12d1-d, which contains a
strong polyadenylation signal, is expressed 140-fold higher
than Cyp12d1-p. This suggests that duplication of Cyp12d1
led to the inclusion of a strong polyadenylation signal in the 30
UTR of Cyp12d1-d by duplication of a sequence already
found in the 50 untranslated region (Fig. 3). Thus, even with
99.4 %nucleotide similarity, duplication ofCyp12d1 does not
necessarily produce a double dose of gene expression, as even
seemingly slight changes in the 30 UTR affect transcript
abundance.
To address whether the observed sequence differences in the 30 UTR of Cyp12d1-d and Cyp12d1-p translate into
expression differences, we measured the absolute levels of
Cyp12d1-d and Cyp12d1-d transcript’s abundance in the reference
strain y; cn bw sp.We found significant differences in
basal expression levels, where Cyp12d1-d, which contains a
strong polyadenylation signal, is expressed 140-fold higher
than Cyp12d1-p. This suggests that duplication of Cyp12d1
led to the inclusion of a strong polyadenylation signal in the 30
UTR of Cyp12d1-d by duplication of a sequence already
found in the 50 untranslated region (Fig. 3). Thus, even with
99.4 %nucleotide similarity, duplication ofCyp12d1 does not
necessarily produce a double dose of gene expression, as even
seemingly slight changes in the 30 UTR affect transcript
abundance.
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