Premature Centromeric Division and Abortions

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Premature Centromeric Division and Abortions

An increased frequency of mitoses with centromere separation affecting all chromosomes was found in lymphocyte cultures of couples with recurrent spontaneous abortions. This anomaly was recorded in six individuals out of seventy couples (one hundred and forty individuals) with recurrent miscarriages. The abnormal behaviour of centromeres may predispose the individual to cell division errors, th...

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Repetitive centromeric satellite RNA is essential for kinetochore formation and cell division

Chromosome segregation requires centromeres on every sister chromatid to correctly form and attach the microtubule spindle during cell division. Even though centromeres are essential for genome stability, the underlying centromeric DNA is highly variable in sequence and evolves quickly. Epigenetic mechanisms are therefore thought to regulate centromeres. Here, we show that the 359-bp repeat sat...

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Centromeric regions control autonomous segregation tendencies in single-division meiosis of Saccharomyces cerevisiae.

We have previously shown that yeast cdc5 or cdc14 homozygotes can be led through a single-division meiosis in which some of the chromosomes segregate reductionally whereas others, within the same cell, segregate equationally. Chromosomes XI tend to segregate reductionally, whereas chromosomes IV tend to segregate equationally. In this report we present experiments with cdc5 homozygous strains, ...

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Infertility and amenorrhoea following abortions.

Of 410 cases of spontaneous or induced abortion in the first or second trimester that were followed up, 95 were infertile. 18 of these had amenorrhea and 12 had oligomenorrhea. Amenorrhea and oligorrhea were more prevalent among the women who were over 31. Amenorrhea, oligomenorrhea, and infertility were more frequent after spontaneous than after induced abortion. Asymptomatic tubal block r...

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Nucleosomes and centromeric DNA packaging.

The eukaryotic chromosome is a conserved structure, with the DNA double-helix wrapping around octamers of histone proteins to form the chromatin, which is further packaged into chromosomes. The centromere defines the kinetochore, the region of spindle microtubule attachment that pulls the two replicated chromatids of each chromosome apart during cell division (Fig. 1), leading to fidelity in tr...

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ژورنال

عنوان ژورنال: INTERNATIONAL JOURNAL OF HUMAN GENETICS

سال: 2001

ISSN: 0972-3757,2456-6330

DOI: 10.31901/24566330.2001/01.03.06