Epileptic encephalopathy as a new feature of the sudden infant death with dysgenesis of the testes syndrome caused by TSPYL1 variants.

Fiche publication


Date publication

septembre 2022

Journal

American journal of medical genetics. Part A

Auteurs

Membres identifiés du Cancéropôle Est :
Pr FAIVRE Laurence, Pr PHILIPPE Christophe, Dr NAMBOT Sophie, Mr DUFFOURD Yannis, Pr THAUVIN-ROBINET Christel, Dr MAZEL Benoît


Tous les auteurs :
Mazel B, Mallet D, Roucher-Boulez F, Signor CB, Bournez M, Darmency V, Bourgeois V, Poe C, El Khabbaz F, Vitobello A, Philippe C, Duffourd Y, Thauvin-Robinet C, Faivre L, Nambot S

Résumé

Sudden infant death with dysgenesis of the testes syndrome (SIDDT) is a rare autosomal recessive disorder associating developmental sex disorder (DSD) in patients with 46,XY karyotype and visceroautonomic dysfunction responsible for sudden infant death. First described in 2004, very few patients have since been reported. We describe here a new patient with SIDDT and epileptic encephalopathy (EE). We provide the phenotypic description and genetic results of a boy carrying biallelic TSPYL1 deleterious variants. We also reviewed the data of the 26 previously described patients with SIDDT. Our patient presented gonadal dysgenesis, cardio-respiratory dysfunction, and repeated seizures, leading in 1 month to severe intractable EE. He died at age 10 months of cardiorespiratory arrest. Four other reported patients from two families presented with progressive epilepsy, including one with severe EE. No similar phenotype was described in the 22 other patients and the recurrent variant p.Val242Glufs*52 appears to be more frequently associated with seizures. To note, our patient is the first case with compound heterozygous TSPYL1 variants. These findings expand the phenotypic spectrum of SIDDT by reporting progressive epilepsy and severe EE as a possible outcome. This information may help in managing patients with SIDDT.

Mots clés

TSPYL1, epilepsy, extension phenotype spectrum, review, sudden infant death syndrome

Référence

Am J Med Genet A. 2022 09 9;: