Protocadherin 21

Potential calcium-dependent cell-adhesion protein. May be required for the structural integrity of the outer segment (OS) of photoreceptor cells (By similarity).

Cone-rod dystrophy 15

CORD15

An autosomal recessive retinal dystrophy characterized by retinal pigment deposits visible on fundus examination, predominantly in the macular region, and initial loss of cone photoreceptors followed by rod degeneration. This leads to decreased visual acuity and sensitivity in the central visual field, followed by loss of peripheral vision. Severe loss of vision occurs earlier than in retinitis pigmentosa, due to cone photoreceptors degenerating at a higher rate than rod photoreceptors.

None

The disease is caused by variants affecting the gene represented in this entry.

Undergoes proteolytic cleavage; produces a soluble 95 kDa N-terminal fragment and a 25 kDa cell-associated C-terminal fragment.

• Cell membrane
• Single-pass membrane protein
• Localized at the junction between the inner and outer segments of rod and cone photoreceptors cells. Confined to the base of the OS. Localized on the edges of nascent evaginating disks on the side of the OS opposite the connecting cilium. Expressed at postnatal day 2 at the apical tip of the rod photoreceptor cells, the site of the developing OS. Colocalized with rhodopsin between postnatal days 2 and 9 at the base of the growing OS region (By similarity).

KIAA1775, PCDH21, PRCAD, CDHR1, Cadherin-related family member 1, Photoreceptor cadherin, Protocadherin-21, prCAD

• entrezGene:92211
• omim:609502
• swissprot:Q96JP9

Proteins

Developmental Biology

81503Da