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Related Concept Videos

Meiosis I01:49

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Meiosis is a carefully orchestrated set of cell divisions, the goal of which—in humans—is to produce haploid sperm or eggs, each containing half the number of chromosomes present in somatic cells elsewhere in the body. Meiosis I is the first such division, and involves several key steps, among them: condensation of replicated chromosomes in diploid cells; the pairing of homologous chromosomes and their exchange of information; and finally, the separation of homologous chromosomes by...
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The primary microtubule organizing center (MTOC) in animal cells is the centrosome. A centrosome has two cylindrical centrioles at its core. Each centriole consists of nine sets of three microtubules held together by proteins. The centrioles are positioned at right angles to each other and surrounded by a shapeless protein cloud called the pericentriolar matrix, or pericentriolar material (PCM).
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The seminal work of Ohno in 1970 popularized the idea of gene duplication and divergence. DNA sequence comparison studies reveal that a large portion of the genes in bacteria, archaebacteria, and eukaryotes was  generated by gene duplication and divergence, indicating its critical role in evolution.
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During meiosis, chromosomes occasionally separate improperly. This occurs due to failure of homologous chromosome separation during meiosis I or failed sister chromatid separation during meiosis II. In some species, notably plants, nondisjunction can result in an organism with an entire additional set of chromosomes, which is called polyploidy. In humans, nondisjunction can occur during male or female gametogenesis and the resulting gametes possess one too many or one too few chromosomes.
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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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Related Experiment Videos

Caudal duplication syndrome.

Muhammad Ramzan1, Shoaib Ahmed1, Salman Ali1

  • 1Department of Paediatric Medicine, Military Hospital, Rawalpindi.

Journal of the College of Physicians and Surgeons--Pakistan : JCPSP
|January 14, 2014
PubMed
Summary
This summary is machine-generated.

Caudal duplication syndrome is a rare congenital condition involving duplication of the genitourinary, gastrointestinal, and vertebral systems. This case highlights a complex presentation in an infant, emphasizing the syndrome

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Area of Science:

  • Medical Genetics
  • Developmental Biology
  • Pediatric Surgery

Background:

  • Caudal duplication syndrome (CDS) is a rare congenital anomaly.
  • It results from incomplete separation of mono-ovular twins or conjoined twinning.
  • CDS presents with variable malformations, often involving the genitourinary, gastrointestinal, and vertebral systems.

Observation:

  • A 3-month-old male infant presented with a classical form of caudal duplication syndrome.
  • The infant exhibited duplication of the gastrointestinal tract, genitourinary system, and vertebral column.
  • Associated anomalies included an anterior abdominal wall hernia and a large lipomeningocele.

Findings:

  • The case exemplifies a severe presentation of caudal duplication syndrome.
  • Multiple congenital malformations were observed, consistent with syndromic duplication.
  • Diagnostic imaging and clinical examination confirmed the extent of the duplications and associated defects.

Implications:

  • Early diagnosis and surgical intervention are crucial for managing CDS.
  • Understanding the embryological basis of CDS aids in predicting associated anomalies.
  • This case underscores the complexity and variability of caudal duplication syndrome, informing clinical management and research.