Ciliopathies

Gene: C21orf2

Green List (high evidence)

Axial spondylometaphyseal dysplasia (SMDAX) is characterized by postnatal growth failure, including rhizomelic short stature in early childhood that evolves into short trunk in late childhood, and thoracic hypoplasia that may cause mild to moderate respiratory problems in the neonatal period and later susceptibility to airway infection. Impaired visual acuity comes to medical attention in early life and vision rapidly deteriorates. Retinal changes are diagnosed as retinitis pigmentosa or pigmentary retinal degeneration on funduscopic examination and as cone-rod dystrophy on ERG. Radiologic hallmarks include short ribs with flared and cupped anterior ends, mild spondylar dysplasia, lacy iliac crests, and metaphyseal irregularities essentially confined to the proximal femora. At least 7 unrelated families reported.

7 families also reported with isolated retinal dystrophy.

New HGNC approved name is CFAP410.

Created: 26 Jun 2021, 7:25 a.m. | Last Modified: 26 Jun 2021, 7:32 a.m.

Panel Version: 0.325

Mode of inheritance
BIALLELIC, autosomal or pseudoautosomal

Phenotypes
Spondylometaphyseal dysplasia, axial, MIM# 602271; Retinal dystrophy with macular staphyloma, MIM# 617547

Publications

• 26974433
• 27548899
• 28422394
• 26294103
• 23105016
• 27548899