Fig. 3.

Fig. 3.

Distinctive features of Chr4. a) Distribution of sequences across the 25 zebrafish chromosomes for satellite sequences MOSAT-2 and SAT2, genes encoding the protein-coding domains IPR007111 NACHT, genes encoding IPR013087 C2H2-type zinc fingers, and certain nonprotein-coding genes including maternal 5S rRNA genes (somatic 5S rRNA genes on Chr18 not shown), snRNA genes, and tRNA genes. b) Positions of these sequences along Chr4 are specifically enriched or excluded from Region-2 (Anderson et al. 2012; Howe et al. 2013; Howe et al. 2016). MOSAT-2 is largely restricted to Region-2, while reciprocally, SAT-2 is absent from Region-2. Maternal 5S genes, snRNAs, and tRNAs are largely restricted to Region-2, while NACHT domain containing NLR genes and zinc finger genes are distributed along the length of Chr4R. Although several of these factors had been reported to be specific for Chr4R, we show here that, except for the NACHT and ZNF families, they are unique to Region-2.