A novel TTC26 variant in a patient with hexadactyly, pituitary stalk interruption, hepatopathy, nephropathy, and bilateral lip-palate cleft: A case report and expansion of the phenotype.
BRENS
TTC26
ciliopathy
cleft lip-palate
hexadactyly
panhypopituitarism
Journal
American journal of medical genetics. Part A
ISSN: 1552-4833
Titre abrégé: Am J Med Genet A
Pays: United States
ID NLM: 101235741
Informations de publication
Date de publication:
22 Dec 2023
22 Dec 2023
Historique:
revised:
29
10
2023
received:
07
09
2023
accepted:
09
12
2023
medline:
23
12
2023
pubmed:
23
12
2023
entrez:
22
12
2023
Statut:
aheadofprint
Résumé
Biallelic pathogenic variants in the TTC26 gene are known to cause BRENS (biliary, renal, neurological, skeletal) syndrome, an ultra-rare autosomal recessive condition with only few patients published to date. BRENS syndrome is characterized by hexadactyly, severe neonatal cholestasis, and involvement of the brain, heart, and kidney, however the full phenotypic and genotypic spectrum is unknown. Here, we report on a previously undescribed homozygous intronic TTC26 variant (c.1006-5 T > C) in a patient showing some of the known TTC26-associated features like hexadactyly, hypopituitarism, hepatopathy, nephropathy, and congenital heart defect. Moreover, he presented with a suspected unilateral hearing loss and bilateral cleft lip-palate. The variant is considered to affect correct splicing by the loss of the canonical acceptor splice site and activation of a cryptic acceptor splice site. Hereby, our patient represents one additional patient with BRENS syndrome carrying a previously unreported TTC26 variant. Furthermore, we confirm the involvement of the pituitary gland to be a common clinical feature of the syndrome and broaden the clinical spectrum of TTC26 ciliopathy to include facial clefts and a probable hearing involvement.
Identifiants
pubmed: 38135897
doi: 10.1002/ajmg.a.63515
doi:
Types de publication
Case Reports
Langues
eng
Sous-ensembles de citation
IM
Informations de copyright
© 2023 The Authors. American Journal of Medical Genetics Part A published by Wiley Periodicals LLC.
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