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DNA satellite and chromatin organization at mouse centromeres and pericentromeres.
Packiaraj, Jenika; Thakur, Jitendra.
Affiliation
  • Packiaraj J; Department of Biology, Emory University, 1510 Clifton Rd, Atlanta, GA, 30322, USA.
  • Thakur J; Department of Biology, Emory University, 1510 Clifton Rd, Atlanta, GA, 30322, USA. jthakur@emory.edu.
Genome Biol ; 25(1): 52, 2024 02 20.
Article de En | MEDLINE | ID: mdl-38378611
ABSTRACT

BACKGROUND:

Centromeres are essential for faithful chromosome segregation during mitosis and meiosis. However, the organization of satellite DNA and chromatin at mouse centromeres and pericentromeres is poorly understood due to the challenges of assembling repetitive genomic regions.

RESULTS:

Using recently available PacBio long-read sequencing data from the C57BL/6 strain, we find that contrary to the previous reports of their homogeneous nature, both centromeric minor satellites and pericentromeric major satellites exhibit a high degree of variation in sequence and organization within and between arrays. While most arrays are continuous, a significant fraction is interspersed with non-satellite sequences, including transposable elements. Using chromatin immunoprecipitation sequencing (ChIP-seq), we find that the occupancy of CENP-A and H3K9me3 chromatin at centromeric and pericentric regions, respectively, is associated with increased sequence enrichment and homogeneity at these regions. The transposable elements at centromeric regions are not part of functional centromeres as they lack significant CENP-A enrichment. Furthermore, both CENP-A and H3K9me3 nucleosomes occupy minor and major satellites spanning centromeric-pericentric junctions and a low yet significant amount of CENP-A spreads locally at centromere junctions on both pericentric and telocentric sides. Finally, while H3K9me3 nucleosomes display a well-phased organization on major satellite arrays, CENP-A nucleosomes on minor satellite arrays are poorly phased. Interestingly, the homogeneous class of major satellites also phase CENP-A and H3K27me3 nucleosomes, indicating that the nucleosome phasing is an inherent property of homogeneous major satellites.

CONCLUSIONS:

Our findings reveal that mouse centromeres and pericentromeres display a high diversity in satellite sequence, organization, and chromatin structure.
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Texte intégral: 1 Collection: 01-internacional Base de données: MEDLINE Sujet principal: Éléments transposables d'ADN / Nucléosomes Limites: Animals Langue: En Journal: Genome Biol / Genome biol / Genome biology (Online) Sujet du journal: BIOLOGIA MOLECULAR / GENETICA Année: 2024 Type de document: Article Pays d'affiliation: États-Unis d'Amérique Pays de publication: Royaume-Uni

Texte intégral: 1 Collection: 01-internacional Base de données: MEDLINE Sujet principal: Éléments transposables d'ADN / Nucléosomes Limites: Animals Langue: En Journal: Genome Biol / Genome biol / Genome biology (Online) Sujet du journal: BIOLOGIA MOLECULAR / GENETICA Année: 2024 Type de document: Article Pays d'affiliation: États-Unis d'Amérique Pays de publication: Royaume-Uni