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Medientyp:
E-Artikel
Titel:
The supernumerary B chromosome of maize: drive and genomic conflict
Beteiligte:
Birchler, James A.;
Yang, Hua
Erschienen:
The Royal Society, 2021
Erschienen in:Open Biology
Sprache:
Englisch
DOI:
10.1098/rsob.210197
ISSN:
2046-2441
Entstehung:
Anmerkungen:
Beschreibung:
<jats:p>The supernumerary B chromosome of maize is dispensable, containing no vital genes, and thus is variable in number and presence in lines of maize. In order to be maintained in populations, it has a drive mechanism consisting of nondisjunction at the pollen mitosis that produces the two sperm cells, and then the sperm with the two B chromosomes has a preference for fertilizing the egg as opposed to the central cell in the process of double fertilization. The sequence of the B chromosome coupled with B chromosomal aberrations has localized features involved with nondisjunction and preferential fertilization, which are present at the centromeric region. The predicted genes from the sequence have paralogues dispersed across all A chromosomes and have widely different divergence times suggesting that they have transposed to the B chromosome over evolutionary time followed by degradation or have been co-opted for the selfish functions of the supernumerary chromosome.</jats:p>