TY - JOUR

T1 - Mapping epigenetic modifications on chicken lampbrush chromosomes

AU - Kulikova, Tatiana

AU - Surkova, Anna

AU - Zlotina, Anna

AU - Krasikova, Alla

N1 - Funding Information: This work was supported by the Russian Science Foundation (grant no. 19– 74-20075). Publisher Copyright: © 2020 The Author(s). Copyright: Copyright 2020 Elsevier B.V., All rights reserved.

PY - 2020/8/3

Y1 - 2020/8/3

N2 - Background: The epigenetic regulation of genome is crucial for implementation of the genetic program of ontogenesis through establishing and maintaining differential gene expression. Thus mapping of various epigenetic modifications to the genome is relevant for studying the regulation of gene expression. Giant transcriptionally active lampbrush chromosomes are an established tool for high resolution physical mapping of the genome and its epigenetic modifications. This study is aimed at characterizing the epigenetic status of compact chromatin domains (chromomeres) of chicken lampbrush macrochromosomes. Results: Distribution of three epigenetic modifications - 5-methylcytosine, histone H3 trimethylated at lysine 9 and hyperacetylated histone H4 - along the axes of chicken lampbrush chromosomes 1-4, Z and W was analyzed in details. Enrichment of chromatin domains with the investigated epigenetic modifications was indicated on the cytological chromomere-loop maps for corresponding chicken lampbrush chromosomes. Heterogeneity in the distribution of 5-methylcytosine and histone H3 trimethylated at lysine 9 along the chromosome axes was revealed. Conclusions: On examples of certain chromomeres of chicken lampbrush chromosomes 1, 3, 4 and W we demonstrated that a combination of immunofluorescent staining and fluorescence in situ hybridization allows to relate the epigenetic status and a DNA sequence context of individual chromomeres.

AB - Background: The epigenetic regulation of genome is crucial for implementation of the genetic program of ontogenesis through establishing and maintaining differential gene expression. Thus mapping of various epigenetic modifications to the genome is relevant for studying the regulation of gene expression. Giant transcriptionally active lampbrush chromosomes are an established tool for high resolution physical mapping of the genome and its epigenetic modifications. This study is aimed at characterizing the epigenetic status of compact chromatin domains (chromomeres) of chicken lampbrush macrochromosomes. Results: Distribution of three epigenetic modifications - 5-methylcytosine, histone H3 trimethylated at lysine 9 and hyperacetylated histone H4 - along the axes of chicken lampbrush chromosomes 1-4, Z and W was analyzed in details. Enrichment of chromatin domains with the investigated epigenetic modifications was indicated on the cytological chromomere-loop maps for corresponding chicken lampbrush chromosomes. Heterogeneity in the distribution of 5-methylcytosine and histone H3 trimethylated at lysine 9 along the chromosome axes was revealed. Conclusions: On examples of certain chromomeres of chicken lampbrush chromosomes 1, 3, 4 and W we demonstrated that a combination of immunofluorescent staining and fluorescence in situ hybridization allows to relate the epigenetic status and a DNA sequence context of individual chromomeres.

KW - Chicken

KW - Chromatin domain

KW - Chromomere

KW - Cytological chromomere-loop map

KW - Epigenetic modifications

KW - Gene mapping

KW - Histone modifications

KW - Karyotype

KW - Lampbrush chromosomes

KW - Methylated cytosine

KW - Tandem repeats

UR - http://www.scopus.com/inward/record.url?scp=85089382033&partnerID=8YFLogxK

U2 - 10.1186/s13039-020-00496-0

DO - 10.1186/s13039-020-00496-0

M3 - Article

AN - SCOPUS:85089382033

VL - 13

SP - 1

EP - 15

JO - Molecular Cytogenetics

JF - Molecular Cytogenetics

SN - 1755-8166

IS - 1

M1 - 32

ER -