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Karyotyping01:17

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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 a...

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Tissue-specific mosaicism for tetrasomy 9p uncovered by array CGH.

Marwa I Shehab1, Inas Mazen, Susan Bint

  • 1Human Cytogenetics Department, Human Genetics and Genome Research Division, National Research Centre, Cairo, Egypt.

American Journal of Medical Genetics. Part A
|October 15, 2011
PubMed
Summary

Mosaic tetrasomy 9p can present with mild symptoms, as shown in a patient with tissue-specific mosaicism. Array comparative genomic hybridization (aCGH) is crucial for accurate diagnosis and prognosis in such cases.

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Area of Science:

  • Genetics
  • Genomic Medicine
  • Clinical Cytogenetics

Background:

  • Tetrasomy 9p, a chromosomal abnormality, typically presents with a severe phenotype.
  • Accurate diagnosis is essential for patient prognosis and genetic counseling.

Observation:

  • A patient with genital anomalies and a mild clinical phenotype was initially diagnosed with non-mosaic tetrasomy 9p via karyotype analysis of lymphocytes.
  • Further testing using array comparative genomic hybridization (aCGH) revealed tissue-specific mosaicism, with a lower proportion of abnormal cells in saliva compared to blood.

Findings:

  • Array CGH demonstrated that the patient had mosaic tetrasomy 9p, explaining the milder clinical presentation.
  • This contrasts with non-mosaic tetrasomy 9p, which is often lethal.
  • The study highlights the importance of investigating different tissue types when karyotype results suggest non-mosaic tetrasomy 9p.

Implications:

  • Array CGH can accurately detect and quantify mosaicism, potentially avoiding invasive procedures like skin biopsies.
  • Non-invasive samples like saliva or buccal smears can be used for aCGH analysis.
  • This approach allows for more precise genetic counseling and improved prognostic accuracy for patients with chromosomal abnormalities.