Molecular and physical characterization of the complex pericentromeric heterochromatin of the vole species Microtus thomasi
Jazyk angličtina Země Švýcarsko Médium print-electronic
Typ dokumentu časopisecké články, práce podpořená grantem
PubMed
25402553
DOI
10.1159/000368648
PII: 000368648
Knihovny.cz E-zdroje
- MeSH
- Arvicolinae genetika metabolismus MeSH
- buněčný rodokmen MeSH
- centromera ultrastruktura MeSH
- centrozom ultrastruktura MeSH
- DNA chemie MeSH
- fenotyp MeSH
- heterochromatin chemie MeSH
- hybridizace in situ fluorescenční MeSH
- karyotypizace MeSH
- křížení genetické MeSH
- repetitivní sekvence nukleových kyselin MeSH
- telomery ultrastruktura MeSH
- zvířata MeSH
- Check Tag
- mužské pohlaví MeSH
- ženské pohlaví MeSH
- zvířata MeSH
- Publikační typ
- časopisecké články MeSH
- práce podpořená grantem MeSH
- Názvy látek
- DNA MeSH
- heterochromatin MeSH
A new repeated DNA from Microtus thomasi, Mth-Alu2.2, was cloned and characterized and is presented here for the first time. Digestion of genomic DNA from M. thomasi with AluI restriction enzyme revealed a 2.2-kb repetitive DNA sequence with a high AT content (69%). This sequence consists of a tandemly repeated nonanucleotide of the consensus sequence CACAATGTA, which constitutes approximately 93-95% of the total unit length. The location of the Mth-Alu2.2 sequence in the karyotype was determined by FISH, demonstrating strong hybridization signals in the pericentromeric regions of all chromosomes and in the heterochromatin blocks of several X chromosome variants. In addition, the distribution of the 4 pericentromeric repeat sequences Msat-160, Mth-Alu900, Mth-Alu2.2, and interstitial telomeric repeats was analyzed by in situ hybridization in M. thomasi, in order to shed light on the complex composition of the chromosomal pericentromeric regions in this species. The order and organization of these sequences in the pericentromeric regions are conserved, with slight variations in both the degree of overlapping and the amount of each repeated DNA in the chromosomes. Specifically, Mth-Alu2.2 is localized in the terminal regions of the chromosomes, with Msat-160 occupying the immediately inner region, partially intermixed with Mth-Alu2.2. The sequence Mth-Alu900 is found in internal positions below Msat-160, and the interstitial telomeric repeats are located close to the long-arm euchromatin of the chromosomes.
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