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Intellectual disability v3.1563 WDR37 Eleanor Williams Phenotypes for gene: WDR37 were changed from Global developmental delay; Intellectual disability; Seizures; Abnormality of the eye; Abnormality of nervous system morphology; Hearing abnormality; Abnormality of the cardiovascular system; Abnormality of the skeletal system; Abnormality of the genitourinary system to Global developmental delay; Intellectual disability; Seizures; Abnormality of the eye; Abnormality of nervous system morphology; Hearing abnormality; Abnormality of the cardiovascular system; Abnormality of the skeletal system; Abnormality of the genitourinary system; Neurooculocardiogenitourinary syndrome, OMIM:618652
Intellectual disability v3.1562 WDR37 Eleanor Williams Tag gene-checked tag was added to gene: WDR37.
Intellectual disability v2.1000 WDR37 Rebecca Foulger commented on gene: WDR37: Added missense tag: only missense variants reported so far (PMID:31327510 and PMID:31327508).
Intellectual disability v2.1000 WDR37 Rebecca Foulger Classified gene: WDR37 as Green List (high evidence)
Intellectual disability v2.1000 WDR37 Rebecca Foulger Gene: wdr37 has been classified as Green List (High Evidence).
Intellectual disability v2.1000 WDR37 Rebecca Foulger Mode of pathogenicity for gene: WDR37 was changed from None to Other
Intellectual disability v2.999 WDR37 Rebecca Foulger commented on gene: WDR37: WDR37 was added to the ID panel and rated Green by Konstantinos Varvagiannis. Although WDR37 is not yet associated with a disorder in OMIM or Gene2Phenotype, there are sufficient unrelated cases in two recent papers (PMID:31327510 and PMID:31327508) with a severe ID/DD phenotype for inclusion on the panel. Plus it was agreed at the Webex call on Thurs 8th August with members of the GMS Neurology Specialist Test Group that WDR37 should be rated Green on the epilepsy panel (402). Therefore updated rating from Grey to Green.
Intellectual disability v2.999 WDR37 Rebecca Foulger Tag missense tag was added to gene: WDR37.
Intellectual disability v2.999 WDR37 Rebecca Foulger commented on gene: WDR37
Intellectual disability v2.996 WDR37 Konstantinos Varvagiannis reviewed gene: WDR37: Rating: GREEN; Mode of pathogenicity: Loss-of-function variants (as defined in pop up message) DO NOT cause this phenotype - please provide details in the comments; Publications: 31327510, 31327508; Phenotypes: Global developmental delay, Intellectual disability, Seizures, Abnormality of the eye, Abnormality of nervous system morphology, Hearing abnormality, Abnormality of the cardiovascular system, Abnormality of the skeletal system, Abnormality of the genitourinary system; Mode of inheritance: MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown
Intellectual disability v2.996 WDR37 Konstantinos Varvagiannis Deleted their review
Intellectual disability v2.996 WDR37 Konstantinos Varvagiannis gene: WDR37 was added
gene: WDR37 was added to Intellectual disability. Sources: Literature
Mode of inheritance for gene: WDR37 was set to MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown
Publications for gene: WDR37 were set to 31327510; 31327508
Phenotypes for gene: WDR37 were set to Global developmental delay; Intellectual disability; Seizures; Abnormality of the eye; Abnormality of nervous system morphology; Hearing abnormality; Abnormality of the cardiovascular system; Abnormality of the skeletal system; Abnormality of the genitourinary system
Penetrance for gene: WDR37 were set to unknown
Review for gene: WDR37 was set to GREEN
Added comment: Two concurrent publications by Reis et al. and Kanca et al. (2019 - PMIDs: 31327510, 31327508) report on the phenotype of individuals with de novo WDR37 mutations.

The study by Reis et al. provides clinical details on 4 affected individuals, while 5 further are described by Kanca et al.

4 different de novo variants were reported in these individuals who appear to be unrelated in (and between) the 2 studies [NM_014023.3]:
- c.356C>T (p.Ser119Phe) [Reis indiv. 1 - 3y, Kanca proband 3 - 5m2w]
- c.389C>T (p.Thr130Ile) [Reis indiv. 2 - 22m , Kanca proband 5 - 6w]
- c.374C>T (p.Thr125Ile) [Reis indiv. 3 - 8y , Kanca proband 1 - 7y]
- c.386C>G (p.Ser129Cys) [Reis indiv. 4 - unkn age, Kanca probands 2 and 4, 6.5y and 19y]

Common features included DD/ID (severity relevant for the current panel), seizures (9/9), ocular anomalies (corneal opacity/Peters anomaly, coloboma, microphthalmia etc.) and variable brain, hearing, cardiovascular, skeletal and genitourinary anomalies. Some facial and/or other dysmorphic features (incl. excess nuchal skin / webbed neck) were also frequent among affected individuals. Feeding difficulties and growth deficiency were also among the features observed.

The function of WDR37 is not known. Variants demonstrated comparable protein levels and cellular localization compared to wt.

Reis et al. provide evidence using CRISPR-Cas9 mediated genome editing in zebrafish, to introduce the Ser129Cys variant observed in affected individuals as well as novel missense and frameshift variants. Poor growth (similar to the human phenotype) and larval lethality were noted for missense variants. Head size was proportionately small. Ocular (coloboma/corneal) or craniofacial anomalies were not observed. Zebrafish heterozygous for LoF variants survived to adulthood.

Based on these a dominant-negative mechanism was postulated for missense alleles.

RNA-seq analysis in zebrafish showed upregulation of cholesterol biosynthesis pathways (among the most dysregulated ones).

Previous data in mice, suggest a broad expression pattern for Wdr37 with enrichment in ocular and brain tissues, significant associations in homozygous mutant mice for decreased body weight, grip strength, skeletal anomalies and possible increase (p =< 0.05) in ocular (lens/corneal) and other anomalies [BioGPS and International Mouse Phenotyping Consortium cited].

CG12333 loss (the Drosophila WDR37 ortholog) causes increased bang sensitivity in flies (analogous to the human epilepsy phenotype), defects in copulation and grip strength, phenotypes that were rescued by human reference but not variant cDNAs.

As discussed by Kanca et al. based on data from Drosophila and mice, limited phenotypic similarity of CNVs spanning WDR37 and adjacent genes with the reported individuals and the presence of LoF variants in control populations haploinsufficiency appears unlikely. Gain-of-function is also unlikely, as expression of human variants in flies did not exacerbate the observed phenotypes. A dominant-negative effect is again proposed.

WDR37 is not associated with any phenotype in OMIM/G2P.

As a result WDR37 can be considered for inclusion in the ID and epilepsy panels with green (relevant phenotype, sufficient cases, animal models) or amber rating.
Sources: Literature