CAKUT

Gene: DACT1

ESHG 2020 Conference presentation/abstract - C14.2 - Heterozygous DACT1 mutations in patients with renal anomalies and features of Townes-Brocks syndrome Helge Martens - WES in a patient with renal anomalies, i.e. left-sided agenesis and right-sided duplex, who also had extrarenal abnormalities, e.g. anorectal and sacral malformation, They found a rare heterozygous missense variant in DACT1 gene. The variant was inherited from an unaffected mother. Then looked in further patients and found 7 maternally inherited, heterozygous, likely pathogenic DACT1 missense variants in 8 of 209 families. Appears to be reduced penetrance. Functional assays found Dact1 expression in different organs including anal canal and kidney, whereby renal expression was confined to the mesenchyme of ureter, kidney capsule, cortical and medullary stroma in mouse embryos. CRISPR/Cas9-derived Dact1-deficient murine inner medullary collecting duct cells showed impaired tubule formation. No publication relating to this data is found in PubMed.

Created: 7 Jun 2020, 3:37 p.m. | Last Modified: 7 Jun 2020, 4:33 p.m.

Panel Version: 1.152

Red List (low evidence)

Gene added from New gene/phenotype relationship(s) cataloged in OMIM. In PMID: 28054444 Webb et al. (2017) 6 affected members of a 3-generation family with Townes-Brocks syndrome-2, identified heterozygosity for a nonsense mutation in the DACT1 gene that segregated fully with disease. Clinical Features include imperforate anus, rectovaginal fistula, crossed fused renal ectopia, vesicoureteral reflux, unilateral microtia, Overfolded helices and cupped ears.

Created: 17 Aug 2017, 9:41 a.m.

Mode of inheritance
MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown

Phenotypes
Townes-Brocks syndrome 2,617466; TBS2

Publications

• 28054444
• 22610794
• 19701191