regulation of transcription by galactose carbon catabolite repression of transcription by galactose A transcription regulation process in which the presence of galactose that leads to a decrease in the frequency, rate, or extent of transcription of specific genes involved in the metabolism of other carbon sources. Carbon catabolite repression is a mechanism of genetic regulation which the accumulation of catabolites of one substance in the cell represses the formation of enzymes that contribute to the catabolism of other substances. down-regulation of transcription by galactose downregulation of transcription by galactose down regulation of transcription by galactose biological_process inhibition of transcription by galactose GO:0000410 carbon catabolite repression of transcription