Mosaic trisomy 7 and renal dysplasia

Area of Science:

• Genetics
• Developmental Biology
• Pediatric Nephrology

Background:

• Trisomy 7, a chromosomal abnormality, is rarely observed in liveborn infants.
• The full phenotype associated with trisomy 7 remains incompletely characterized.
• Renal anomalies are suspected to be a common feature of trisomy 7.

Purpose of the Study:

• To report a case of trisomy 7 detected in fetal umbilical cord cells.
• To investigate the association between trisomy 7 and renal dysplasia.
• To contribute to the understanding of the trisomy 7 phenotype.

Main Methods:

• Culturing of umbilical cord cells from a fetus diagnosed with renal dysplasia.
• Karyotyping of cultured umbilical cord cells.
• Culture and cytogenetic analysis of skin fibroblasts for comparison.

Main Results:

• Trisomy 7 was identified in the cultured umbilical cord cells.
• The fetus presented with renal dysplasia.
• Skin fibroblasts from the same fetus were found to be diploid, indicating tissue-specific chromosomal abnormalities.

Conclusions:

• Trisomy 7 can occur in fetal development and is associated with renal dysplasia.
• The findings highlight the importance of cytogenetic analysis in cases of fetal malformations.
• Further studies are needed to fully delineate the clinical spectrum of trisomy 7.