Satellite DNA and chromosomal evolution in Ctenomys rodents: A necessary clarification

ROSSI M S

CYTOGENETIC AND GENOME RESEARCH

KARGER

Lugar: Würzburg (Germany); Año: 2011 vol. 134 p. 163 - 164

1424-8581

@font-face { font-family: "Times New Roman"; }p.MsoNormal, li.MsoNormal, div.MsoNormal { margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: "Times New Roman"; }table.MsoNormalTable { font-size: 10pt; font-family: "Times New Roman"; }div.Section1 { page: Section1; } Recently Cytogenetic and Genome Resarch published an article by A. Novello, S. Villar and J. Urioste that among other points analyzes the relation between heterochromatin content and chromosomal diploid and fundamental number (FN) in seven populations belonging to Uruguayan species of the Ctenomys.  After expressing heterochromatin content as the percentage of C-positive areas of entire metaphases, the authors performed a linear regression test between these percentages and 2n and NF values. Since the regression values resulted low, they concluded that in the case of the Uruguayan Ctenomys populations, heterochromatin is not involved in chromosomal rearrangements. This conclusion seems to enter in contradiction with our previous work in which we showed that expansion and contractions of RPCS are associated with changes in karyotypes while stasis of RPCS correlated to chromosomal stability. However, these two papers differ in the group of studied species and –beeing the main point- in the experimental approaches. Complete article DOI:10.1159/000324700