Advances in overgrowth syndromes: clinical classification to molecular delineation in Sotos syndrome and Beckwith-Wiedemann syndrome.

Abstract:

PURPOSE OF REVIEW:The clinical importance of overgrowth syndromes in the pediatric patient population has been increasingly recognized during the past decade, but clinical overlap among overgrowth syndromes often makes diagnostic categorization difficult. Advances in the molecular delineation of overgrowth syndromes in recent years have furthered our knowledge of the phenotypic spectrum of this group of conditions. This review focuses on developments in our understanding of the molecular mechanisms and phenotype-genotype correlations in the two most common overgrowth syndromes, Beckwith-Wiedemann syndrome and Sotos syndrome. The implications of these findings with respect to clinical diagnosis, medical management, and genetic counseling are discussed. RECENT FINDINGS:Recent reports have redefined the cardinal clinical features of Sotos syndrome, and the identification of two distinct types of molecular alterations in patients with this syndrome has enabled assessment of phenotype-genotype correlations. Recent studies in patients with Beckwith-Wiedemann syndrome have further expanded our understanding of the causative molecular mechanisms of this condition and provide evidence for specific genotype-phenotype correlations, most notably with respect to tumor risk. SUMMARY:Recognition of childhood overgrowth and investigation of diagnostic causes is important in anticipating appropriate medical management and facilitating the provision of genetic counseling. New developments in our understanding of the molecular basis and phenotypic expression of overgrowth syndromes provide additional tools in this often challenging process.

journal_name

Curr Opin Pediatr

authors

Cytrynbaum CS,Smith AC,Rubin T,Weksberg R

doi

10.1097/01.mop.0000187191.74295.97

keywords:

subject

Has Abstract

pub_date

2005-12-01 00:00:00

pages

740-6

issue

6

eissn

1040-8703

issn

1531-698X

pii

00008480-200512000-00012

journal_volume

17

pub_type

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