Distinct patterns of TE master loci activity in ovaries, early embryos, and OSS cells define germline and somatic clusters
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Data of Brennecke et al. (2008) was used for ovary and 0–2-h embryo reads. Note that 42AB and 38C are highly expressed in ovaries and embryos, but not in OSS cells, and are thus germline expressed and maternally transmitted (pink). Reciprocally, 20AB (flamenco) is very highly expressed in OSS cells and moderately so in ovaries, but is barely detected in embryos; it is therefore somatically expressed (green). 20A is expressed in all three samples (blue). The unshaded loci are novel clusters that generate abundant uniquely mapped piRNAs in OSS cells. The chr2R and chrX clusters comprise isolated gypsy-family elements that exhibit strong somatic patterns; the >70-kb chrU cluster is expressed in all three samples but is strongest in OSS cells. Complete TE master loci data are found in Supplemental Table S3.
