Clinical Correlation of Chromosome 22q11.2 Fluorescent in Situ Hybridization Analysis and Velocardiofacial Syndrome

Abstract

Objective:

To identify characteristics associated with microdeletions of chromosome 22q11.2 ascertained by fluorescent in situ hybridization (FISH) analysis in patients with velopharyngeal insufficiency (VPI), cleft palate, or other clinical features of velocardiofacial syndrome (VCFS).

Design/Setting:

Retrospective review of all patients entered at one tertiary-level multidisciplinary cleft lip and palate and craniofacial anomalies panel from January 2000 to December 2003.

Patients:

The study consisted of 115 patients. The presence or absence of the following clinical features was documented: cleft palate (submucous and overt), VPI, cardiac anomalies, renal anomalies, small stature, characteristic facies, developmental delay, psychiatric dysfunction, and family history.

Main Outcome Measure:

Correlation between presence or absence of clinical features of VCFS and presence or absence of 22q11.2 microdeletion by FISH analysis.

Results:

Of the 16 patients (13.9%) who demonstrated 22q11.2 microdeletion by FISH analysis, 16 had VPI (100%), 16 had small stature (100%), 14 had cleft palate (88%), and 13 had characteristic facies (81%). Developmental delay was also present in 13 of these patients (81%), and seven had cardiac anomalies (44%). Multiple regression analysis revealed that the presence of characteristic facies and small stature statistically correlated with microdeletions of chromosome 22q11.2 by FISH studies (p < .05).

Conclusions:

Patients with microdeletions of chromosome 22q11.2 as demonstrated by FISH analysis were more likely to have VPI, small stature, cleft palate, characteristic facies, and developmental delay, in descending order. Statistical analysis showed that only characteristic facies and small stature correlated with 22q11.2 microdeletions.

Keywords

22q11.2 microdeletion FISH analysis velocardiofacial syndrome

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