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ALPK1 missense pathogenic variant in five families leads to ROSAH syndrome, an ocular multisystem autosomal dominant disorder.

ABSTRACT: PURPOSE:To identify the molecular cause in five unrelated families with a distinct autosomal dominant ocular systemic disorder we called ROSAH syndrome due to clinical features of retinal dystrophy, optic nerve edema, splenomegaly, anhidrosis, and migraine headache. METHODS:Independent discovery exome and genome sequencing in families 1, 2, and 3, and confirmation in families 4 and 5. Expression of wild-type messenger RNA and protein in human and mouse tissues and cell lines. Ciliary assays in fibroblasts from affected and unaffected family members. RESULTS:We found the heterozygous missense variant in the ?-kinase gene, ALPK1, (c.710C>T, [p.Thr237Met]), segregated with disease in all five families. All patients shared the ROSAH phenotype with additional low-grade ocular inflammation, pancytopenia, recurrent infections, and mild renal impairment in some. ALPK1 was notably expressed in retina, retinal pigment epithelium, and optic nerve, with immunofluorescence indicating localization to the basal body of the connecting cilium of the photoreceptors, and presence in the sweat glands. Immunocytofluorescence revealed expression at the centrioles and spindle poles during metaphase, and at the base of the primary cilium. Affected family member fibroblasts demonstrated defective ciliogenesis. CONCLUSION:Heterozygosity for ALPK1, p.Thr237Met leads to ROSAH syndrome, an autosomal dominant ocular systemic disorder.

SUBMITTER: Williams LB 

PROVIDER: S-EPMC6752478 | biostudies-literature | 2019 Sep

REPOSITORIES: biostudies-literature

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ALPK1 missense pathogenic variant in five families leads to ROSAH syndrome, an ocular multisystem autosomal dominant disorder.

Williams Lloyd B LB   Javed Asif A   Sabri Amin A   Morgan Denise J DJ   Huff Chad D CD   Grigg John R JR   Heng Xiu Ting XT   Khng Alexis J AJ   Hollink Iris H I M IHIM   Morrison Margaux A MA   Owen Leah A LA   Anderson Katherine K   Kinard Krista K   Greenlees Rebecca R   Novacic Danica D   Nida Sen H H   Zein Wadih M WM   Rodgers George M GM   Vitale Albert T AT   Haider Neena B NB   Hillmer Axel M AM   Ng Pauline C PC   Shankaracharya   Cheng Anson A   Zheng Linda L   Gillies Mark C MC   van Slegtenhorst Marjon M   van Hagen P Martin PM   Missotten Tom O A R TOAR   Farley Gary L GL   Polo Michael M   Malatack James J   Curtin Julie J   Martin Frank F   Arbuckle Susan S   Alexander Stephen I SI   Chircop Megan M   Davila Sonia S   Digre Kathleen B KB   Jamieson Robyn V RV   DeAngelis Margaret M MM  

Genetics in medicine : official journal of the American College of Medical Genetics 20190410 9

<h4>Purpose</h4>To identify the molecular cause in five unrelated families with a distinct autosomal dominant ocular systemic disorder we called ROSAH syndrome due to clinical features of retinal dystrophy, optic nerve edema, splenomegaly, anhidrosis, and migraine headache.<h4>Methods</h4>Independent discovery exome and genome sequencing in families 1, 2, and 3, and confirmation in families 4 and 5. Expression of wild-type messenger RNA and protein in human and mouse tissues and cell lines. Cili  ...[more]

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