Chromosome Research

, Volume 24, Issue 3, pp 309–323

LINE-related component of mouse heterochromatin and complex chromocenters’ composition

  • Inna S. Kuznetsova
  • Dmitrii I. Ostromyshenskii
  • Alexei S. Komissarov
  • Andrei N. Prusov
  • Irina S. Waisertreiger
  • Anna V. Gorbunova
  • Vladimir A. Trifonov
  • Malcolm A. Ferguson-Smith
  • Olga I. Podgornaya
Article

DOI: 10.1007/s10577-016-9525-9

Cite this article as:
Kuznetsova, I.S., Ostromyshenskii, D.I., Komissarov, A.S. et al. Chromosome Res (2016) 24: 309. doi:10.1007/s10577-016-9525-9

Abstract

Chromocenters are interphase nuclear landmark structures of constitutive heterochromatin. The tandem repeat (TR)-enriched parts of different chromosomes cluster together in chromocenters. There has been progress in recent years in determining the protein content of chromocenters, although it is not clear which DNA sequences underly constitutive heterochromatin apart from the TRs. The aim of the current work was to find out which DNA sequences besides TRs are involved in chromocenters’ formation. Biochemically isolated chromocenters and microdissected centromeric regions were amplified by DOP-PCR, then cloned and sequenced. Alignment to Repbase, the mouse reference genome and WGS databases separated the sequences from both libraries into three groups: (1) sequences with similarity to pericentromere mouse major satellite; (2) sequences without similarity to any repetitive sequences; (3) sequences with similarity to long interspersed nuclear elements (LINEs). LINE-related sequences have a disperse pattern distribution on chromosomes predicted in silico. Selected clones were used for fluorescent in situ hybridization (FISH). The 10 clones tested hybridized to chromocenters and centromeric regions of metaphase chromosomes. These clones were used for double FISH with four known cloned TRs (satDNA, satellite DNA) and a probe specific for the sex chromosomes. The probes bind various chromocenters’ regions without overlapping; so, FISH results reveal a complex chromocenter composition. We mapped 18 LINE-derived clones to the RepBase L1 records. Most of them grouped in a ∼2-kb region at the end of the second ORF and 3′ untranslated region (UTR). So, even the limited number of the clones allows us to determine the region of the L1 element that is specific for heterochromatic regions. Although the L1 full-length probe did not hybridize at detectable levels to the heterochromatic region on any chromosome, the 2-kb fragment found is definitely a part of these regions. The precise LINE ∼2-kb fragment is the component of mouse and human constitutive heterochromatin enriched with TRs. The method used for amplification of the probes from two sources of the heterochromatic material uncovered the enrichment of a precise fragment of LINE within chromocenters.

Keywords

Mouse genome Heterochromatin Tandem repeat LINE Bioinformatics analysis Fluorescent in situ hybridization (FISH) 

Abbreviations

CEN

Centromere

ChrmC

Chromocenters isolated by the biochemical approach

DAPI

4′, 6-diami-dino-2-phenylindole

DOP-PCR

PCR with DOP primer described in the Material and methods section

FISH

Fluorescent in situ hybridization

GPG

Golden Path Gap, 3 Mb empty region around each centromere in assembled genome

MdCP

Microdissected centromeric DNA

MEF

Mouse embryo fibroblast from C3H line

MiSat and MaSat

Centromeric minor and pericentromeric major satellites

MS3 and MS4

Mouse satellite 3 and 4, respectively

LINE

Long interspersed nuclear element

periCEN

Pericentromeric heterochromatin

satDNA

Satellite DNA

SINE

Short interspersed nuclear element

TE

Transposable elements

TR

Tandem repeat

Supplementary material

10577_2016_9525_MOESM1_ESM.doc (2 mb)
Fig. S1(DOC 2012 kb)
10577_2016_9525_MOESM2_ESM.doc (102 kb)
Table S1(DOC 102 kb)

Funding information

Funder NameGrant NumberFunding Note
Russian Foundation for Basic Research
  • 05-04-49156-а
  • 11-04-01700
Russian Science Foundation
  • 15-15-20026
Saint Petersburg State University
  • 1.37.153.2014
Russian Academy of Sciences (RU)
  • 01.2.01457147

Copyright information

© Springer Science+Business Media Dordrecht 2016

Authors and Affiliations

  • Inna S. Kuznetsova
    • 1
    • 2
    • 3
  • Dmitrii I. Ostromyshenskii
    • 1
  • Alexei S. Komissarov
    • 1
    • 2
  • Andrei N. Prusov
    • 4
  • Irina S. Waisertreiger
    • 1
  • Anna V. Gorbunova
    • 1
  • Vladimir A. Trifonov
    • 5
  • Malcolm A. Ferguson-Smith
    • 6
  • Olga I. Podgornaya
    • 1
    • 2
    • 7
  1. 1.Institute of Cytology RASSt PetersburgRussia
  2. 2.St. Petersburg State UniversitySt PetersburgRussia
  3. 3.School of Biomedical SciencesThe Chinese University of Hong KongShatinHong Kong
  4. 4.A.N. Belozersky Institute of Physico-Chemical BiologyLomonosov Moscow State UniversityMoscowRussia
  5. 5.Institute of Molecular and Cellular Biology SB RAS, NovosibirskRussia; Novosibirsk State UniversityNovosibirskRussia
  6. 6.Cambridge Resource Centre for Comparative GenomicsUniversity of CambridgeCambridgeUK
  7. 7.Far Eastern Federal UniversityVladivostokRussia

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