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The harvest mouse ( Micromys minutus ) is a small rodent species with a wide range of vertical distribution in Taiwan, extending from the sea level to 3100 m altitude. This species has recently suffered from habitat loss in high-altitude areas due to orchard cultivation, which may have resulted in mouse migration from high to low altitude. To investigate whether there is any physiological mechanism involved in altitude acclimation, rat cDNA microarray was used to compare transcriptomic patterns of the skeletal muscle tissues taken from individuals native to the high-altitude environment and those transferred to the low-altitude captive site. Of the 23,188 genes being analyzed, 47 (33 up-regulated and 14 down-regulated) were found to have differential expression (fold change &gt; 4 or &lt; -4, ANOVA p &lt; 0.05). However, after multiple testing correction with a false discovery rate (FDR), only the result for Tnfrsf12a was found to be statistically significant (fold change = 13, FDR p &lt; 0.05). The result was confirmed by quantitative polymerase chain reaction (q-PCR). The expression of Tnfrsf12a possibly relates to the skeletal muscle biology and thus can be correlated with altitude acclimation. However, finding only one gene transcript with significant alteration suggests that transcriptomic response may not play a major role in high- to low-altitude acclimation in harvest mouse.

animals

Genome-Wide Microarray Analysis Suggests Transcriptomic Response May Not Play a Major Role in High- to Low-Altitude Acclimation in Harvest Mouse (Micromys minutus)