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A dispermic chimerism in a 2-year-old Caucasian boy
L M Repas-Humpe1, A Humpe, R Lynen
1Department of Pediatrics, University Hospital of Göttingen, Robert-Koch-Strasse 40, D-37075 Göttingen, Germany. ahumpe@med.uni-goettingen.de
Annals of Hematology
|October 20, 1999
Summary
A rare case of dispermic chimera in a child was identified through blood group discrepancies. This condition, a form of true hermaphroditism, resulted from double fertilization, presenting unique genetic and anatomical findings.
Area of Science:
- Genetics
- Developmental Biology
- Pediatrics
Background:
- Dispermic chimerism, a rare genetic condition involving two distinct cell populations from two zygotes, can present diagnostic challenges.
- Early identification is crucial for appropriate medical and surgical management in affected children.
Observation:
- A 2-year-old phenotypically male child exhibited difficulties in blood group determination during presurgical evaluation.
- Analysis revealed two red blood cell populations (O and B) and DNA polymorphisms indicating paternal inheritance from two sperm.
- Cytogenetic analysis showed a 46,XY/46,XX mosaicism in lymphocytes.
Findings:
- The child was diagnosed with dispermic chimerism and true hermaphroditism.
- Surgical findings included a prostatic utricle (pseudovagina) and confirmed the presence of both ovarian and testicular tissue (bilateral gonad biopsy).
Implications:
- This case highlights the importance of comprehensive genetic and laboratory investigations in diagnosing rare conditions like chimerism.
- Understanding the genetic basis of chimerism is vital for accurate diagnosis, management, and counseling regarding reproductive health.