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Published on: October 21, 2015
Clefting, amniotic bands, and polydactyly: a distinct phenotype that supports an intrinsic mechanism for amniotic
Nathaniel H Robin1, Judith Franklin, Sandra Prucka
1Department of Genetics, University of Alabama at Birmingham, 35294-0024, USA. nrobin@uab.edu
Insights
Amniotic band sequence (ABS) can present with birth defects beyond limb constriction, like cleft lip and palate (CLP). This case suggests a potential new syndrome overlapping with ABS, possibly linked to genetic factors.
Area of Science:
- Developmental Biology
- Medical Genetics
Background:
- Amniotic band sequence (ABS) is characterized by congenital anomalies due to fibrous bands disrupting fetal development.
- While ABS typically involves limb defects, its association with other anomalies like cleft lip and palate (CLP) is not fully explained by the entanglement mechanism.
Observation:
- This report details a case with classic ABS limb defects and constriction bands.
- The patient also presented with typical cleft lip and palate (CLP), a supernumerary nipple, polydactyly, and a skin papilla.
Findings:
- The observed constellation of anomalies closely resembles a previously reported case, suggesting a potential distinct syndrome overlapping with ABS.
- This presentation challenges the traditional understanding of ABS etiology.
Implications:
- The findings suggest that ABS-like anomalies coupled with CLP may represent a separate condition, potentially linked to genetic mutations.
- Further research into genes such as Disorganization, p63, or IRF6 is warranted to elucidate the underlying causes.
Abstract:
Amniotic band sequence (ABS) is a well-described condition involving a variety of congenital anomalies in association with fibrous bands. However, many cases are associated with birth defects that are not readily explained by the mechanism of fibrous strings entangling body parts and causing disruption of the fetal structures. The most common of these is typical cleft lip and palate (CLP). Here we describe such a case, with typical ABS limb defects and constriction bands, along with CLP, supernumerary left nipple, polydactyly, and a skin papilla. This case is nearly identical to a child previously described by Guion-Almieda and Richieri-Costa [2000] and may, therefore, represent a previously unrecognized syndrome that overlaps with ABS. Furthermore it may be that cases with ABS-like anomalies associated with CLP represent a different condition, possibly caused by mutations in the genes Disorganization, p63, or IRF6.
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