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Related Experiment Videos

Translocation (3;12) (p21-pter; q24.1-qter) and phenylketonuria.

B B Ganguly1, R Dalvi, A V Mehta

  • 1Centre for Research in Mental Retardation, Malad, Mumbai, India.

Cytobios
|August 2, 2001
PubMed
Summary

This study identified a rare chromosomal translocation, t(3;12), in an 8-year-old girl with phenylketonuria and physical differences. The translocation was inherited from her mother, highlighting the importance of genetic analysis in developmental disorders.

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Area of Science:

  • Medical Genetics
  • Cytogenetics
  • Biochemistry

Background:

  • Cytogenetic karyotyping is crucial for diagnosing genetic disorders and identifying predispositions to diseases.
  • Giemsa-banding is a standard method for analyzing metaphase chromosomes in lymphocytes to detect abnormalities.

Observation:

  • An 8-year-old girl presented with mental retardation and physical dysmorphism.
  • Her peripheral blood lymphocyte culture revealed a diploid karyotype: 46, XX, t(3;12) (p21-pter, q24.1-qter).
  • Biochemical tests confirmed phenylketonuria.

Findings:

  • The patient's karyotype indicated a reciprocal translocation between chromosomes 3 and 12.
  • Maternal karyotyping showed the same translocation, confirming its inheritance.

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Implications:

  • This case highlights the role of chromosomal translocations in developmental disorders like phenylketonuria.
  • Identifying such translocations is vital for genetic counseling and understanding disease mechanisms.
  • Further molecular investigations can be guided by these cytogenetic findings.