Synaptonemal complex analysis of chromosome rearrangements in domestic fowl, <i>Gallus domesticus</i>

Abstract

Electron microscopy of synaptonemal complexes in heterokaryotypic Gallus domesticus cockerels revealed that chromosome rearrangements that had been classified by light microscopy as single breaks were in fact reciprocal translocations. A microchromosome provided the centromere for the acentric long arm of chromosome 1 in a rearrangement that had been classified as a centric fission, and microchromosomes were involved in several other rearrangements. The translocation points were mapped in three of the rearrangements.

Distribution of MLH1 foci on the synaptonemal complexes of chicken oocytes

“…The average relative and absolute lengths are given in Table 1. There is good agreement regarding relative lengths and centromeric indexes with those previously reported for chicken synaptonemal complexes (Solari, 1977;Kaelbling and Fechheimer, 1983), though the relative lengths in the present results were calculated as fractions of the total autosomal SC length, not including the length of the Z chromosome axis. Bivalent 6 is shorter than bivalent 7 which is in agreement with the standard idiogram of the chicken macrochromosomes (Schmid et al, 2000).…”

First report on chicken genes and chromosomes 2000

“…Based on fluorescence measurement, it has been calculated that microchromosomes represent 23 % of the female genome (Smith and Burt, 1998). Electron microscopic analyses of chicken synaptonemal complexes show they are mostly acrocentric (Kaelbling and Fechheimer, 1983). Although it is impossible to obtain characteristic banding patterns for microchromosome pairs, certain features of their structure and functions have been studied (for review, see Rodionov, 1996;Fillon, 1998).…”

Centromere positions in chicken and Japanese quail chromosomes: de novo centromere formation versus pericentric inversions

“…At the same time, the morphology of orthologous chromosomes is different in these two species. The majority of chicken microchromosomes are acrocentric whereas quail microchromosomes are primarily submetacentric (Kaelbling and Fechheimer 1983;Calderón and Pigozzi 2006;Krasikova et al 2006Krasikova et al , 2009. Centromere positions on some macrochromosomes are also different (Ryttman and Tegelstrom 1981;Shibusawa et al 2001Shibusawa et al , 2004.…”