Ehlers-Danlos syndrome and periventricular nodular heterotopia in a Spanish family with a single FLNA mutation.
BACKGROUND
The Ehlers-Danlos syndrome (EDS) comprises a group of hereditary connective tissue disorders. Periventricular nodular heterotopia (PNH) is a human neuronal migration disorder characterised by seizures and conglomerates of neural cells around the lateral ventricles of the brain, caused by FLNA mutations. FLNA encodes filamin A, an actin binding protein involved in cytoskeletal organisation. The amino-terminal actin binding domain (ABD) of filamins contains two tandem calponin homology domains, CHD1 and CHD2.


OBJECTIVE
To report clinical and genetic analyses in a Spanish family affected by a connective tissue disorder suggestive of EDS type III and PNH.


METHODS
A clinical and molecular study was undertaken in the three affected women. Clinical histories, physical and neurological examinations, brain magnetic resonance imaging studies, and skin biopsies were done. Genetic analysis of the FLNA gene was undertaken by direct sequencing and restriction fragment length polymorphism analysis.


RESULTS
Mutation analysis of the FLNA gene resulted in the identification of a novel mutation in exon 3 (c.383C-->T) segregating with the combination of both syndromes. This mutation results in a substitution of an alanine residue (A128V) in CHD1.


CONCLUSIONS
The findings suggest that the Ala128Val mutation causes the dual EDS-PNH phenotype. This association constitutes a new variant within the EDS spectrum. This is the first description of a familial EDS-PNH association with a mutation in FLNA.
Laboratorio de Neurología, Fundación Jiménez Díaz, Madrid, Spain.
P
P
Gómez-Garre
M
M
Seijo
E
E
Gutiérrez-Delicado
M
M
Castro del Río
C
C
de la Torre
C
C
Gómez-Abad
J
J
Morales-Corraliza
M
M
Puig
J M
JM
Serratosa
D019943:Amino Acid Substitution; D001927:Brain Diseases / Q000235:genetics*; D002552:Cerebral Ventricles; D002828:Choristoma / Q000235:genetics*; D003240:Connective Tissue Diseases / Q000235:genetics; D003285:Contractile Proteins / Q000235:genetics*; D004247:DNA / Q000097:blood / Q000235:genetics / Q000302:isolation & purification; D004535:Ehlers-Danlos Syndrome / Q000235:genetics*; D005091:Exons; D005260:Female; D064448:Filamins; D006801:Humans; D008297:Male; D008840:Microfilament Proteins / Q000235:genetics*; D010375:Pedigree; D010641:Phenotype; D013030:Spain
D003285:Contractile Proteins; D064448:Filamins; D008840:Microfilament Proteins; D004247:DNA