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  • Title: A functional centromere lacking CentO sequences in a newly formed ring chromosome in rice.
    Author: Yang R, Li Y, Su Y, Shen Y, Tang D, Luo Q, Cheng Z.
    Journal: J Genet Genomics; 2016 Dec 20; 43(12):694-701. PubMed ID: 27965027.
    Abstract:
    An awned rice (Oryza sativa) plant carrying a tiny extra chromosome was discovered among the progeny of a telotrisomic line 2n+4L. Fluorescence in situ hybridization (FISH) using chromosome specific BAC clones revealed that this extra chromosome was a ring chromosome derived from part of the long arm of chromosome 4. So the aneuploidy plant was accordingly named as 2n+4L ring. We did not detect any CentO FISH signals on the ring chromosome, and found only the centromeric probe Centromeric Retrotransposon of Rice (CRR) was co-localized with the centromere-specific histone CENH3 as revealed by sequential FISH after immunodetection. The extra ring chromosome exhibited a unique segregation pattern during meiosis, including no pairing between the ring chromosome and normal chromosome 4 during prophase I and pre-separation of sister chromatids at anaphase I.
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