Origin of H1 linker histones

@article{Kasinsky2001OriginOH,
  title={Origin of H1 linker histones},
  author={Harold E. Kasinsky and John D. Lewis and Joel B. Dacks and Juan Ausl{\'o}},
  journal={The FASEB Journal},
  year={2001},
  volume={15},
  pages={34 - 42}
}
In which taxa did H1 linker histones appear in the course of evolution? Detailed comparative analysis of the histone H1 and histone Hl‐related sequences available to date suggests that the origin of histone H1 can be traced to bacteria. The data also reveal that the sequence corresponding to the ‘winged helix’ motif of the globular structural domain, a domain characteristic of all metazoan histone H1 molecules, is evolutionarily conserved and appears separately in several divergent lines of… 
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It is shown that the emergence of protamines in chordates occurred very quickly, as a result of the conversion of a lysine-rich histone H1 to an arginine- rich protamine, providing unequivocal support to the notion that vertebrate protamines evolved from histones.
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TLDR
The occurrence of a new histone H1 variant (dBigH1) in Drosophila raises a question about the true definition of its protein members, which appear to be the presence of a lysine- and alanine–rich, intrinsically disordered C-terminal domain.
Fine Mapping of Posttranslational Modifications of the Linker Histone H1 from Drosophila melanogaster
TLDR
For the first time, changes in the PTMs of a linker H1 during the development of a multicellular organism are reported and a polymorphism in the protein sequence is found that can be mistaken with lysine methylation if the analysis is not rigorous.
Kluyveromyces lactis genome harbours a functional linker histone encoding gene.
TLDR
Homology of KlLH1p to the histone H1/H5 protein family with predicted three domain structure characteristic for the linker histones of higher eukaryotes strongly proves that the yeast K. lactis does indeed possess a functional linker Histone gene thus entailing the evolutionary preservation and significance of linkerhistones.
Yeast HMO1: Linker Histone Reinvented
TLDR
HMO1 appears to have evolved a unique linker histone-like function involving the ability to stabilize both conventional nucleosome arrays as well as DNA regions characterized by low nucleosom density or the presence of noncanonical nucleosomes.
A unique vertebrate histone H1‐related protamine‐like protein results in an unusual sperm chromatin organization
TLDR
It is shown that the sperm chromatin of this organism is organized by two type I protamines‐like proteins (PL‐I), and the major protamine‐like component of the fish Mullus surmuletus (striped red mullet) is characterized.
Common phylogenetic origin of protamine-like (PL) proteins and histone H1: Evidence from bivalve PL genes.
TLDR
Evidence is provided that indicates that H1 histones and PLs are the direct descendants of an ancient group of "orphon" H1 replication-dependent histones which were excluded to solitary genomic regions as early in metazoan evolution as before the differentiation of bilaterians.
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