Radial Ray Abnormalities

Gene: DACT1

Red List (low evidence)

Webb et al. (2017) reported 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 with disease. Clinical features include imperforate anus, rectovaginal fistula, crossed fused renal ectopia, vesicoureteral reflux, unilateral microtia, overfolded helices and cupped ears. One family member (proband's mother) with scoliosis and spina bifida occulta. Neural tube defects reported in a study of human fetuses (PMID: 22610794) and a mouse model (PMID: 19701191). Listed in Decipher v10.0 for an individual with abnormalities of (i) head or neck (ii) nervous system (iii) skeletal system. Unlike the gene SALL1 that causes Townes-Brocks syndrome 1, there is no information specifically relating to DACT1 with radial dysplasia, as these were not observed in the family with ?Townes-Brocks syndrome 2 (PMID: 28054444).
Sources: NHS GMS

Created: 22 Jul 2020, 6:09 a.m.

Mode of inheritance
MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted

Phenotypes
?Townes-Brocks syndrome 2 (OMIM #617466)

Publications

• PMID: 28054444
• 22610794
• 19701191