منابع مشابه
Evidence for Centromere Drive in the Holocentric Chromosomes of Caenorhabditis
In monocentric organisms with asymmetric meiosis, the kinetochore proteins, such as CENH3 and CENP-C, evolve adaptively to counterbalance the deleterious effects of centromere drive, which is caused by the expansion of centromeric satellite repeats. The selection regimes that act on CENH3 and CENP-C genes have not been analyzed in organisms with holocentric chromosomes, although holocentrism is...
متن کاملUnlocking Holocentric Chromosomes: New Perspectives from Comparative and Functional Genomics?
The presence of chromosomes with diffuse centromeres (holocentric chromosomes) has been reported in several taxa since more than fifty years, but a full understanding of their origin is still lacking. Comparative and functional genomics are nowadays furnishing new data to better understand holocentric chromosome evolution thus opening new perspectives to analyse karyotype rearrangements in spec...
متن کاملChiasmatic and achiasmatic inverted meiosis of plants with holocentric chromosomes
Meiosis is a specialized cell division in sexually reproducing organisms before gamete formation. Following DNA replication, the canonical sequence in species with monocentric chromosomes is characterized by reductional segregation of homologous chromosomes during the first and equational segregation of sister chromatids during the second meiotic division. Species with holocentric chromosomes e...
متن کاملHere, There, and Everywhere: Kinetochore Function on Holocentric Chromosomes
Cytologists have long observed that individual eukaryotic species segregate their chromosomes in one of two apparently different ways. Monocentric chromosomes attach to microtubules at a particular region (the centromere) and move toward the pole during anaphase with the centromere leading. In contrast, holocentric chromosomes bind to microtubules along their entire length and move broadside to...
متن کاملFlow cytometry may allow microscope-independent detection of holocentric chromosomes in plants
Two chromosomal structures, known as monocentric and holocentric chromosomes, have evolved in eukaryotes. Acentric fragments of monocentric chromosomes are unequally distributed to daughter cells and/or lost, while holocentric fragments are inherited normally. In monocentric species, unequal distribution should generate chimeras of cells with different nuclear DNA content. We investigated wheth...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Hereditas
سال: 2010
ISSN: 0018-0661
DOI: 10.1111/j.1601-5223.1958.tb03498.x