Dmel microbiome is dominated by Acetic acid bacteria (AABs), mainly genus Acetobacter (Alphaproteobacteria), Lactic acid bacteria (LABs), mainly the genus Lactobacillus (Firmicutes) (20). And also a strong representation of other taxa, including Gammaproteobacteria (e.g., Stenotrophomonas spp.) and lactobacilli (e.g., Enterococcus spp.) (22, 23). Acetobacter fabarum, Acetobacter pomorum, Acetobacter tropicalis, Lactobacillus brevis, and Lactobacillus plantarum.
Typically in centromeres and telomerase. Highly repetitive sequence. Have much fewer genes than euchromatin. Can silence gene expression of euchromatin. Heterochromatin increase with age and are more in males. source: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7274899/
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