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OTX2 duplication is implicated in hemifacial microsomia.

Zielinski D, Markus B, Sheikh M, Gymrek M, Chu C, Zaks M, Srinivasan B, Hoffman JD, Aizenbud D, Erlich Y - PLoS ONE (2014)

Bottom Line: Whole-exome sequencing results indicated the absence of a pathogenic coding point mutation.All of these approaches implicated OTX2 as the most likely causal gene.Moreover, OTX2 is a known oncogenic driver in medulloblastoma, a condition that was diagnosed in the proband during the course of the study.

View Article: PubMed Central - PubMed

Affiliation: Whitehead Institute for Biomedical Research, Cambridge, Massachusetts, United States of America.

ABSTRACT
Hemifacial microsomia (HFM) is the second most common facial anomaly after cleft lip and palate. The phenotype is highly variable and most cases are sporadic. We investigated the disorder in a large pedigree with five affected individuals spanning eight meioses. Whole-exome sequencing results indicated the absence of a pathogenic coding point mutation. A genome-wide survey of segmental variations identified a 1.3 Mb duplication of chromosome 14q22.3 in all affected individuals that was absent in more than 1000 chromosomes of ethnically matched controls. The duplication was absent in seven additional sporadic HFM cases, which is consistent with the known heterogeneity of the disorder. To find the critical gene in the duplicated region, we analyzed signatures of human craniofacial disease networks, mouse expression data, and predictions of dosage sensitivity. All of these approaches implicated OTX2 as the most likely causal gene. Moreover, OTX2 is a known oncogenic driver in medulloblastoma, a condition that was diagnosed in the proband during the course of the study. Our findings suggest a role for OTX2 dosage sensitivity in human craniofacial development and raise the possibility of a shared etiology between a subtype of hemifacial microsomia and medulloblastoma.

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Related in: MedlinePlus

The five-generation pedigree.The family consists of five affected individuals spanning eight meioses. The proband (V.3) is indicated by an arrow. We were able to obtain consent from individuals IV.3 and V.3 to publish photos.
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pone-0096788-g001: The five-generation pedigree.The family consists of five affected individuals spanning eight meioses. The proband (V.3) is indicated by an arrow. We were able to obtain consent from individuals IV.3 and V.3 to publish photos.

Mentions: We identified a five generation Ashkenazi kinship that displays variable HFM anomalies in five individuals separated by a total of eight meiosis events (Figure 1, Table 1). In all cases, the family denied consanguinity and the disorder appears to follow an autosomal dominant segregation pattern with incomplete penetrance and variable expressivity.


OTX2 duplication is implicated in hemifacial microsomia.

Zielinski D, Markus B, Sheikh M, Gymrek M, Chu C, Zaks M, Srinivasan B, Hoffman JD, Aizenbud D, Erlich Y - PLoS ONE (2014)

The five-generation pedigree.The family consists of five affected individuals spanning eight meioses. The proband (V.3) is indicated by an arrow. We were able to obtain consent from individuals IV.3 and V.3 to publish photos.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4016008&req=5

pone-0096788-g001: The five-generation pedigree.The family consists of five affected individuals spanning eight meioses. The proband (V.3) is indicated by an arrow. We were able to obtain consent from individuals IV.3 and V.3 to publish photos.
Mentions: We identified a five generation Ashkenazi kinship that displays variable HFM anomalies in five individuals separated by a total of eight meiosis events (Figure 1, Table 1). In all cases, the family denied consanguinity and the disorder appears to follow an autosomal dominant segregation pattern with incomplete penetrance and variable expressivity.

Bottom Line: Whole-exome sequencing results indicated the absence of a pathogenic coding point mutation.All of these approaches implicated OTX2 as the most likely causal gene.Moreover, OTX2 is a known oncogenic driver in medulloblastoma, a condition that was diagnosed in the proband during the course of the study.

View Article: PubMed Central - PubMed

Affiliation: Whitehead Institute for Biomedical Research, Cambridge, Massachusetts, United States of America.

ABSTRACT
Hemifacial microsomia (HFM) is the second most common facial anomaly after cleft lip and palate. The phenotype is highly variable and most cases are sporadic. We investigated the disorder in a large pedigree with five affected individuals spanning eight meioses. Whole-exome sequencing results indicated the absence of a pathogenic coding point mutation. A genome-wide survey of segmental variations identified a 1.3 Mb duplication of chromosome 14q22.3 in all affected individuals that was absent in more than 1000 chromosomes of ethnically matched controls. The duplication was absent in seven additional sporadic HFM cases, which is consistent with the known heterogeneity of the disorder. To find the critical gene in the duplicated region, we analyzed signatures of human craniofacial disease networks, mouse expression data, and predictions of dosage sensitivity. All of these approaches implicated OTX2 as the most likely causal gene. Moreover, OTX2 is a known oncogenic driver in medulloblastoma, a condition that was diagnosed in the proband during the course of the study. Our findings suggest a role for OTX2 dosage sensitivity in human craniofacial development and raise the possibility of a shared etiology between a subtype of hemifacial microsomia and medulloblastoma.

Show MeSH
Related in: MedlinePlus