If I want to identify gene which express in one condition. Is it possible in deseq2. Because I think Deseq2 calculate logfoldchange for the gene that express in two condition  and test statistic for significant gene. However it will produce the gene that express in higher or lower but not the gene that not express.

For Example, the gene express in treat condition not in control condition.

Thank you  for any suggestion.

We don’t have a concept of what is expressed or not, that is we don’t distinguish betweeen small counts from lowly expressed vs “not expressed”.