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Further delineation of the phenotype of chromosome 14q13 deletions: (positional) involvement of FOXG1 appears the main determinant of phenotype severity, with no evidence for a holoprosencephaly locus

Identifieur interne : 000015 ( Main/Exploration ); précédent : 000014; suivant : 000016

Further delineation of the phenotype of chromosome 14q13 deletions: (positional) involvement of FOXG1 appears the main determinant of phenotype severity, with no evidence for a holoprosencephaly locus

Auteurs : Gijs W E. Santen [Pays-Bas] ; Yu Sun [Pays-Bas] ; Antoinet C J. Gijsbers [Pays-Bas] ; Aurore Carré [France] ; Maureen Holvoet [Belgique] ; Arie Van Haeringen [Pays-Bas] ; Saskia A J. Lesnik Oberstein [Pays-Bas] ; Akemi Tomoda [Japon] ; Hiroyo Mabe [Japon] ; Michel Polak [France] ; Koenraad Devriendt [Belgique] ; Claudia A L. Ruivenkamp [Pays-Bas] ; Emilia K. Bijlsma [Pays-Bas]

Source :

RBID : ISTEX:19B70F75031B330BE13D2F2041DDC4671E05BF94

Abstract

Background Deletions including chromosome 14 band q13 have been linked to variable phenotypes. With current molecular methods the authors aim to elucidate a genotype–phenotype correlation by accurately determining the size and location of the deletions and the associated phenotype. Methods Here the authors report the molecular karyotyping and phenotypic description of seven patients with overlapping deletions including chromosome 14q13. Results The authors show that deletions including 14q13 result in a recognisable phenotype mainly due to haploinsufficiency of two genes (NKX2-1, PAX9). FOXG1 (on chromosome band 14q12) involvement seems to be the main determinant of phenotype severity. The patients in this study without FOXG1 involvement and deletions of up to 10 Mb have a relatively mild phenotype. The authors cannot explain why some patients in literature with overlapping but smaller deletions appear to have a more severe phenotype. A previously presumed association with holoprosencephaly could not be confirmed as none of the patients in this series had holoprosencephaly. Conclusions FOXG1 appears the main determinant of the severity of phenotypes resulting from deletions including 14q13. The collected data show no evidence for a locus for holoprosencephaly in the 14q13 region, but a locus for agenesis of the corpus callosum cannot be excluded.


Url:
DOI: 10.1136/jmedgenet-2011-100721


Affiliations:


Links toward previous steps (curation, corpus...)


Le document en format XML

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<div type="abstract">Background Deletions including chromosome 14 band q13 have been linked to variable phenotypes. With current molecular methods the authors aim to elucidate a genotype–phenotype correlation by accurately determining the size and location of the deletions and the associated phenotype. Methods Here the authors report the molecular karyotyping and phenotypic description of seven patients with overlapping deletions including chromosome 14q13. Results The authors show that deletions including 14q13 result in a recognisable phenotype mainly due to haploinsufficiency of two genes (NKX2-1, PAX9). FOXG1 (on chromosome band 14q12) involvement seems to be the main determinant of phenotype severity. The patients in this study without FOXG1 involvement and deletions of up to 10 Mb have a relatively mild phenotype. The authors cannot explain why some patients in literature with overlapping but smaller deletions appear to have a more severe phenotype. A previously presumed association with holoprosencephaly could not be confirmed as none of the patients in this series had holoprosencephaly. Conclusions FOXG1 appears the main determinant of the severity of phenotypes resulting from deletions including 14q13. The collected data show no evidence for a locus for holoprosencephaly in the 14q13 region, but a locus for agenesis of the corpus callosum cannot be excluded.</div>
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