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Related Concept Videos

Meiosis I01:49

Meiosis I

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 a...
Nondisjunction01:29

Nondisjunction

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.
Nondisjunction01:29

Nondisjunction

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.
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 sister...
Anorexia Nervosa01:28

Anorexia Nervosa

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.
Symptoms and Physical Effects
Individuals with anorexia nervosa commonly exhibit extreme...
Cushing Syndrome II: Pathophysiology01:19

Cushing Syndrome II: Pathophysiology

Cortisol production is normally governed by the hypothalamic–pituitary–adrenal (HPA) axis, which maintains hormonal balance through tightly regulated feedback mechanisms. Disruption of this regulatory system is central to the development of Cushing syndrome, whether the excess cortisol originates from external medications or internal pathology. Persistent cortisol elevation alters metabolism, immune function, and endocrine signaling, producing the characteristic clinical features of the...

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Updated: Jul 7, 2026

A Strategy to Identify de Novo Mutations in Common Disorders such as Autism and Schizophrenia
05:51

A Strategy to Identify de Novo Mutations in Common Disorders such as Autism and Schizophrenia

Published on: June 15, 2011

The Noonan syndrome.

A Sanchez-Cascos

    European Heart Journal
    |April 1, 1983
    PubMed
    Summary
    This summary is machine-generated.

    Noonan syndrome presents with characteristic facial features, cardiac anomalies like pulmonary stenosis, and developmental delays. Electrocardiographic findings can aid in diagnosis, suggesting a possible branchial arch development link.

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    Published on: May 11, 2018

    Area of Science:

    • Genetics and Developmental Biology
    • Cardiology
    • Clinical Medicine

    Background:

    • Noonan syndrome is a genetic disorder with diverse clinical manifestations.
    • Facial dysmorphia, cardiac defects, and developmental issues are hallmarks.
    • Understanding its etiology is crucial for diagnosis and management.

    Purpose of the Study:

    • To describe the clinical and electrocardiographic features of Noonan syndrome in a cohort of patients.
    • To identify key diagnostic indicators for Noonan syndrome.
    • To explore potential pathogenetic mechanisms, specifically a link to branchial arch development.

    Main Methods:

    • Retrospective analysis of clinical data from 21 patients diagnosed with Noonan syndrome.
    • Detailed examination of facial stigmata, physical characteristics, and cognitive assessments.
    • Review of electrocardiographic (ECG) findings, including specific waveform abnormalities.

    Main Results:

    • Common facial features included telecanthus, low-set ears, epicanthus, and facial asymmetry.
    • Pterygium colli, pectus deformities, and mild intellectual disability were frequently observed.
    • Pulmonary stenosis and patent ductus arteriosus were the most prevalent cardiac anomalies; specific ECG patterns (wide QRS, left axis deviation, giant Q waves, negative V6) were noted.

    Conclusions:

    • Noonan syndrome exhibits a consistent pattern of facial, cardiac, and developmental abnormalities.
    • Electrocardiography provides valuable diagnostic clues.
    • The findings support the hypothesis that Noonan syndrome may represent a disorder of branchial arch development.