A GC-rich satellite DNA and karyology of the bivalve mollusk Donax trunculus: a dominance of GC-rich heterochromatin.

Abstract:

:We characterized the DTF2 satellite DNA family of the clam Donaxtrunculus and compared its chromosomal localization with cytogenetic data revealed by fluorochrome banding, C-banding, and 28S rDNA FISH. In contrast to the other satellites detected previously in this species, DTF2 is an abundant (2%) GC-rich satellite that exhibits CpG methylation. Sequence characteristics of DTF2 indicate that its evolution is not affected by constraints that might indicate some functional interactions. Fluorescence in situ hybridization revealed subtelomeric location of this satellite on a subset of 14 out of 19 D. trunculus chromosome pairs. The chromomycin A(3) (CMA) staining of GC-rich regions on D. trunculus chromosomes revealed a complex banding pattern that overlaps completely with C-bands. In total, only three bands show subtelomeric location, while 13 bands are located interstitially, one of them being coincident with the 28S rDNA hybridization signal. No bands, either CMA positive (GC-rich) or DAPI positive (AT-rich) were detected at centromeric chromosomal positions. Only two of the CMA-positive bands co-localize with the DTF2 satellite, showing a) the presence of small islands of GC-rich repetitive sequences that remained undetected by CMA/C-banding and b) the abundance of DTF2-divergent GC-rich sequences at interstitial chromosomal locations.

journal_name

Cytogenet Genome Res

authors

Petrović V,Pérez-García C,Pasantes JJ,Satović E,Prats E,Plohl M

doi

10.1159/000200089

subject

Has Abstract

pub_date

2009-01-01 00:00:00

pages

63-71

issue

1

eissn

1424-8581

issn

1424-859X

pii

000200089

journal_volume

124

pub_type

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