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Byapti Banerjee1, Atreyee Dutta1, Sanchita Roy1

  • 1Department of Genetics, Nirnayan Healthcare Pvt. Ltd, Kolkata, India.

概括

染色体异常是原发性异常 (PA) 的关键,这是一个常见的妇科疾病. 早期的细胞遗传分析和卡里奥型鉴定对于准确的诊断和改善青少年女孩PA的管理至关重要.

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Nondisjunction01:21

Nondisjunction

Nondisjunction is the failure of homologous chromosomes or sister chromatids to separate correctly and move to the opposite poles of the cells. This produces daughter cells with abnormal chromosome numbers.  Nondisjunction is common during anaphase I or anaphase II of meiosis.  Mutations in synaptonemal complex proteins that attach homologous chromosomes increase the chances of nondisjunction in anaphase I of meiosis I. In contrast, mutations in topoisomerases and condensins that hold...
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Oogenesis02:07

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Meiosis I03:09

Meiosis I

Meiosis is the division of a diploid cell into haploid cells forming sperm and eggs in animals through differentiation. Meiosis I is the first stage of meiosis, where the genetic recombination of homologous chromosomes and the reduction of the ploidy level by half occurs.
Prophase I is the most extended and complex step of meiosis I characterized by synapsis, chromosome pairing, and recombination of the homologous chromosomes. This process is facilitated by a proteinaceous structure called the...
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Karyotyping01:17

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