A complex three way translocation resulting in two sibs with partial trisomy 3p23----3pter

Area of Science:

• Genetics
• Human genetics
• Medical genetics

Background:

• Congenital anomalies and psychomotor retardation can arise from complex chromosomal rearrangements.
• Identifying the specific genetic basis is crucial for understanding disease mechanisms and inheritance patterns.

Observation:

• A male infant presented with multiple congenital anomalies and psychomotor retardation.
• Karyotype analysis revealed partial trisomy for the distal region of chromosome 3p.
• An affected sister shared an identical karyotype.

Findings:

• The affected siblings' karyotype indicated a translocation.
• Parental chromosome studies identified a balanced translocation involving chromosomes 3, 11, and 18 in the mother.
• An identical balanced translocation was present in a phenotypically normal sibling.

Implications:

• This case illustrates a familial translocation leading to partial trisomy 3p and associated developmental disorders.
• Understanding such translocations is vital for genetic counseling and reproductive planning.
• Further research into the specific genes on chromosome 3p involved in development is warranted.