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Related Concept Videos

Meiosis vs. Mitosis02:57

Meiosis vs. Mitosis

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Cell division is necessary for growth and reproduction in organisms. Mitosis aids cell growth and development by dividing somatic cells. In contrast, meiosis causes the division of germ cells and plays an essential role in sexual reproduction. Due to their unique functional requirements, mitosis and meiosis differ from each other in multiple aspects.
Before the start of mitosis and meiosis I, the cell synthesizes DNA, resulting in two homologous copies of each chromosome. DNA synthesis is...
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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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Nondisjunction01:29

Nondisjunction

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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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Nondisjunction01:21

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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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Intellectual disability (ID) is a neurodevelopmental condition characterized by deficits in intellectual and adaptive functioning that manifest during the developmental period. This condition encompasses challenges in reasoning, memory, problem-solving, and learning, accompanied by impairments in everyday life skills, such as communication, self-care, and social interactions. Intellectual disability affects approximately 1% of the population in the United States, impacting an estimated 5...
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Anorexia nervosa is a complex and severe eating disorder characterized by an intense fear of weight gain, an unrelenting pursuit of thinness, and a distorted body image. It often leads to dangerously low body weight relative to an individual's age and height. This disorder is marked by significant physical and psychological consequences, making it one of the most life-threatening psychiatric illnesses.
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In Vitro Modeling of Down Syndrome Neurogenesis Using Human-Induced Pluripotent Stem Cells
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Risk factors for mortality in Down syndrome.

H Uppal1, S Chandran2, R Potluri1

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Summary
This summary is machine-generated.

Individuals with Down syndrome face significant health issues, with respiratory failure being a key risk factor for mortality. Early detection and management of illnesses are crucial for improving life expectancy in this population.

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Area of Science:

  • Genetics and Medicine
  • Clinical Research
  • Public Health

Background:

  • Down syndrome is a genetic condition associated with reduced life expectancy.
  • Investigated common comorbidities and mortality risk factors in Down syndrome patients.
  • Compared a Down syndrome cohort with a matched general population cohort.

Purpose of the Study:

  • To identify prevalent comorbidities in hospitalized patients with Down syndrome.
  • To determine the primary risk factors for mortality in this population.
  • To compare mortality risk factors between Down syndrome patients and the general population.

Main Methods:

  • Retrospective analysis of one million NHS patient records.
  • Identified 558 patients with Down syndrome.
  • Age- and gender-matched control group of 5580 individuals.

Main Results:

  • Hypothyroidism (22.9%) and epilepsy (20.3%) were most common comorbidities.
  • Septal defects and dementia showed highest relative risks in Down syndrome.
  • Respiratory failure, dementia, and pneumonia were linked to mortality; respiratory failure was the sole significant risk factor (RR=9.791).

Conclusions:

  • Significant medical morbidity exists in Down syndrome, impacting life expectancy.
  • Respiratory failure is a critical risk factor for mortality in Down syndrome.
  • Thorough medical evaluation is essential for managing treatable illnesses in individuals with Down syndrome.