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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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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.
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Pleiotropy is the phenomenon in which a single gene impacts multiple, seemingly unrelated phenotypic traits. For example, defects in the SOX10 gene cause Waardenburg Syndrome Type 4, or WS4, which can cause defects in pigmentation, hearing impairments, and an absence of intestinal contractions necessary for elimination. This diversity of phenotypes results from the expression pattern of SOX10 in early embryonic and fetal development. SOX10 is found in neural crest cells that form melanocytes,...
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Like autosomes, sex chromosomes contain a variety of genes necessary for normal body function. When a mutation in one of these genes results in biological deficits, the disorder is considered sex-linked.
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Related Experiment Video

Updated: Mar 2, 2026

Generation of Induced Pluripotent Stem Cells from Turner Syndrome 45XO Fetal Cells for Downstream Modelling of Neurological Deficits Associated with the Syndrome
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Ito syndrome.

Doreen Crawford, Annette Dearmun1

  • 1Oxford University Hospital NHS Trust.

Nursing Children and Young People
|May 10, 2017
PubMed
Summary

Children with Ito syndrome exhibit distinctive swirling skin pigmentation patterns on their trunk and linear patterns on limbs. This unique presentation is a key diagnostic feature for this rare genetic disorder.

Area of Science:

  • Dermatology
  • Genetics
  • Pediatrics

Background:

  • Ito syndrome, also known as Incontinentia Pigmenti Achromians, is a rare genetic disorder.
  • It is characterized by congenital anomalies, including neurological and skeletal abnormalities.
  • Unusual skin pigmentation is a hallmark feature of this condition.

Purpose of the Study:

  • To describe the characteristic dermatological findings in children diagnosed with Ito syndrome.
  • To highlight the diagnostic significance of specific pigmentation patterns.
  • To enhance awareness among clinicians regarding the visual presentation of Ito syndrome.

Main Methods:

  • Observational study analyzing clinical photographs and patient records.
  • Detailed documentation of skin pigmentation patterns, including location, morphology, and distribution.

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  • Correlation of dermatological findings with established diagnostic criteria for Ito syndrome.

    • Main Results:

    • Children with Ito syndrome commonly present with unusual pigmentation.
    • The pigmentation typically manifests as swirling patterns around the trunk.
    • Linear, line-like patterns are frequently observed along the legs and arms.

    Conclusions:

    • The characteristic swirling and linear pigmentation patterns are crucial diagnostic markers for Ito syndrome in pediatric patients.
    • Early recognition of these dermatological signs can facilitate timely diagnosis and management.
    • Further research into the genetic and developmental basis of these pigmentary anomalies is warranted.