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 |