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Table 1 Hydractinia echinata histone complement

From: The cnidarian Hydractinia echinata employs canonical and highly adapted histones to pack its DNA

  Expression pattern Replication-dependency? Histone type Genomic locus
H1.1 Male, female, feeding polyps Y§ Core histone 1 exon, canonical cluster incl. H1, H2A, H2B, H3, H4
H1.2 Male, female, feeding polyps N§ Hydractinia variant Single locus, 2 exon
H1.3 Pseudogene Single locus, 1 exon
H2A.1 Transcripts present in all life stages analysed Y§§ Core histone 1 exon, canonical cluster incl. H1, H2A, H2B, H3, H4
H2A.Z Male, female, feeding polyps N Replication-independent variant Single locus, 5 exons
H2A.X.1 Male, female, feeding polyps N Replication-independent variant Single locus, 2 exons
H2A.X.2 Female germ cells N Hydractinia variant Single locus, 5 exons
macroH2A Transcripts present in all life stages analysed N Replication-independent variant Single locus, 8 exons
H2B.1 Male, female, feeding polyps Y§ Core histone 1 exon, canonical cluster incl. H1, H2A, H2B, H3, H4
H2B.2 Transcripts present in male polyps only Y§§ Hydractinia variant 1 exon, germ cell-specific cluster incl. H2B.2, H2B.5 H2B.6
H2B.3 Male germ cells Y§ Hydractinia variant Single locus, 1 exon
H2B.4 Embryo, male, female, feeding polyps Y§ Hydractinia variant Single locus, 1 exon
H2B.5 Male germ cells Y§§ Hydractinia variant 1 exon, germ cell-specific cluster incl. H2B.2, H2B.5 H2B.6
H2B.6 Male germ cells Y§§ Hydractinia variant 1 exon, germ cell-specific cluster incl. H2B.2, H2B.5 H2B.6
H3.3.1 Male, female, feeding polyps N§ Replication-independent variant Single locus, 2 exons
H3.3.2 Male, female, feeding polyps Y§ Replication-dependent Hydractinia and Echinoderm variant Single locus, 1 exon
H3.1 Male, female, feeding polyps Y§§ Core histone 1 exon, canonical cluster incl. H1, H2A, H2B, H3, H4
CENP-A Transcripts present in all life stages, highest in male polyps N Replication-independent variant Single locus, 2 exons
H4.1 Male, female, feeding polyps Y§§ Core histone Canonical cluster incl. H1, H2A, H2B, H3, H4
  1. § Confirmed using EdU incorporation
  2. §§ 3′-UTR stem-loop present