Centromere positions in chicken and Japanese quail chromosomes: de novo centromere formation versus pericentric inversions
نویسندگان
چکیده
منابع مشابه
De novo centromere formation on a chromosome fragment in maize.
The centromere is the part of the chromosome that organizes the kinetochore, which mediates chromosome movement during mitosis and meiosis. A small fragment from chromosome 3, named Duplication 3a (Dp3a), was described from UV-irradiated materials by Stadler and Roman in the 1940s [Stadler LJ, Roman H (1948) Genetics 33(3):273-303]. The genetic behavior of Dp3a is reminiscent of a ring chromoso...
متن کاملDe Novo Centromere Formation and Centromeric Sequence Expansion in Wheat and its Wide Hybrids.
Centromeres typically contain tandem repeat sequences, but centromere function does not necessarily depend on these sequences. We identified functional centromeres with significant quantitative changes in the centromeric retrotransposons of wheat (CRW) contents in wheat aneuploids (Triticum aestivum) and the offspring of wheat wide hybrids. The CRW signals were strongly reduced or essentially l...
متن کاملSequential de novo centromere formation and inactivation on a chromosomal fragment in maize.
The ability of centromeres to alternate between active and inactive states indicates significant epigenetic aspects controlling centromere assembly and function. In maize (Zea mays), misdivision of the B chromosome centromere on a translocation with the short arm of chromosome 9 (TB-9Sb) can produce many variants with varying centromere sizes and centromeric DNA sequences. In such derivatives o...
متن کاملRapid De Novo Centromere Formation Occurs Independently of Heterochromatin Protein 1 in C. elegans Embryos
DNA injected into the Caenorhabditis elegans germline forms extrachromosomal arrays that segregate during cell division [1, 2]. The mechanisms underlying array formation and segregation are not known. Here, we show that extrachromosomal arrays form de novo centromeres at high frequency, providing unique access to a process that occurs with extremely low frequency in other systems [3-8]. De novo...
متن کاملPrecise centromere positioning on chicken chromosome 3.
Despite the progress of the chicken (Gallus gallus) genome sequencing project, the centromeric sequences of most macrochromosomes remain unknown. This makes it difficult to determine centromere positions in the genome sequence assembly. Using giant lampbrush chromosomes from growing oocytes, we analyzed in detail the pericentromeric region of chicken chromosome 3. Without knowing the DNA sequen...
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ژورنال
عنوان ژورنال: Chromosome Research
سال: 2012
ISSN: 0967-3849,1573-6849
DOI: 10.1007/s10577-012-9319-7