The phrase "a decline in expression" is correct and usable in written English.
It can be used to describe a reduction or decrease in the way something is expressed, whether in art, communication, or other forms of representation.
Example: "The recent studies indicate a decline in expression among young artists, leading to concerns about the future of creativity."
Alternatives: "a decrease in expression" or "a reduction in expression".
Previous reports have demonstrated that transgene silencing in transgenic cells may occur through a decline in expression levels rather than in the proportion of expressing cells [6], [17], [24], but the present data do not clarify this point, and a decrease in the percentage of positive cells was evident.
However, in the colonic epithelium, Lambert et al. found a decline in expression associated with transition to malignancy[ 35].
We observed a decline in expression of the several floral homeotic genes, FT genes, auxin responsive genes in ripe fruit.
Yet in each experiment we observed that treatment of proliferating lymphocytes, TK6 or A549 cells led to a decline in expression of γH2AX and ATM-S1981P.
Both genes displayed a decline in expression as the seed coat matured, but PsLAR transcripts decreased significantly faster than PsANR transcript.
Actually, careful inspection of their data provides some evidence of a decline in expression of γH2AX upon treatment with metformin [ 73].
Formalin fixation caused a decline in miRNA expression, but expression profiles from frozen and FFPE samples from the same tumor were generally still highly correlated.
Mouse microRNA 34a (mmu-miR-34a) expression increases in brain of older rodents, while a decline in its expression over age is linked to longevity in calorie-restricted mouse brain [ 13, 16].
Formalin fixation and paraffin embedding caused a decline in miRNA expression of between 0.5 and ~1.5 Cq; yet, correlation between miRNA expression in frozen- and FFPE tissue from the same tumor was still high.
When compared with young animals, aged Ldlr−/− mice on HFD showed a decline in the expression of antioxidant genes, which was directly related with a decrease in Nrf2 expression [ 65].
In acute aerobic exercise studies, 40% revealed a decline in the expression of the receptors, 7% reported no significant difference, 40% showed an increase, and 13% did not evaluate their expression.
