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Duplication 6q24 leads to 6qter in an infant from a balanced paternal translocation
Insights
Duplication of the 6q chromosome region, specifically 6q25 to 6qter, results in a distinct genetic syndrome. This condition is associated with characteristic physical and developmental abnormalities in affected individuals.
Area of Science:
- Genetics
- Human Chromosome Abnormalities
- Clinical Dysmorphology
Background:
- Balanced translocations can lead to unbalanced chromosomal rearrangements in offspring.
- Chromosomal duplications are a known cause of congenital anomalies and developmental disorders.
Observation:
- A case report details an infant girl with a de novo duplication of 6q (6q24 to 6qter) inherited from a father with a balanced translocation t(3;6).
- The patient presented with a constellation of dysmorphic features including proportionate short stature, microcephaly, micrognathia, specific facial anomalies, and limb abnormalities.
- Developmental assessment revealed psychomotor retardation.
Findings:
- The combination of clinical features in this patient, along with eleven previously reported cases, strongly suggests a recognizable syndrome associated with 6q duplication.
- The critical region for this syndrome appears to involve at least 6q25 to 6qter.
Implications:
- This study contributes to the delineation of chromosomal syndromes, aiding in genetic diagnosis and counseling.
- Understanding the phenotypic consequences of 6q duplication can improve the identification and management of affected individuals.
Abstract:
Duplication of 6q24 leads to 6qter was identified by GTG banding in an infant girl whose father was a balanced translocation carrier 46,XY,t(3;6)(p26 leads to q2402). At birth and at 4 mo she had proportionate short stature, microcephaly, asymmetric micrognathia, bow-shaped upper vermilion, long upper lip, submucous cleft palate, antimongoloid slant of palpebral fissures, telecanthus, prominent eyes, short neck with anterior and lateral webbing, short sternum, overlapping toes, wrist contractures, and hypertonicity. Later she was noted to have psychomotor retardation. Eleven previously published cases and our patient suggest that duplication of 6q (involving at least 6q25 leads to 6qter) produces a highly characteristic syndrome.