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Optic neuropathy v5.53 NRDC Ida Ertmanska gene: NRDC was added
gene: NRDC was added to Optic neuropathy. Sources: Literature
Q1_26_promote_green tags were added to gene: NRDC.
Mode of inheritance for gene: NRDC was set to BIALLELIC, autosomal or pseudoautosomal
Publications for gene: NRDC were set to 41734767
Phenotypes for gene: NRDC were set to microcephaly, MONDO:0001149; neurodevelopmental disorder, MONDO:0700092; Optic neuropathy, HP:0001138
Review for gene: NRDC was set to GREEN
Added comment: PMID: 41734767 Pehlivan et al., 2026
Report of 14 individuals from nine unrelated families carrying homozygous NRDC pathogenic variants (some reported previously). Common clinical features include severe to profound developmental delay/intellectual disability (12/12), microcephaly (13/13), prematurity (5/13), lethality in the first 3 years of life (9/14), seizures (7/11), joint contractures (4/8), eye/visual abnormalities (5/7 - 3 with optic atrophy, 1 with nystagmus, and 1 case of visual inattentiveness), and abnormal brain imaging studies ranging from diffuse atrophy to lissencephaly (8/11). The identified variants include two splice, three frameshift, and three missense variants.

NRDC is not yet associated with a phenotype in OMIM (accessed 9th Mar 2026).
Sources: Literature
Optic neuropathy v5.49 FSD1L Ida Ertmanska gene: FSD1L was added
gene: FSD1L was added to Optic neuropathy. Sources: Literature
Q1_26_promote_green tags were added to gene: FSD1L.
Mode of inheritance for gene: FSD1L was set to BIALLELIC, autosomal or pseudoautosomal
Publications for gene: FSD1L were set to 41720098; 41720099
Phenotypes for gene: FSD1L were set to neurodevelopmental disorder, MONDO:0700092
Review for gene: FSD1L was set to GREEN
Added comment: PMID: 41720098 Serpieri et al., 2026
Report of eleven individuals (including five fetuses) from six unrelated families harbouring biallelic FSD1L variants. Seq method: exome sequencing. Consanguinity was confirmed in 4/6 families, and suspected in the fifth.
Phenotype spectrum: severe intellectual disability (5/5 assessed from 3 families), epilepsy (5 individuals from 3 families), severe hydrocephalus (3 families), vision deficit due to optic nerve hypoplasia/atrophy (3 families), spastic tetraparesis (2 families) corpus callosum hypoplasia/agenesis on MRI (5/5 families assessed),

Variants detected - largely nonsense type:
Family A - homozygous c.409T>G (p.Leu137Val);
Family B - 3 affected fetuses homozygous for c.1411C>T (p.Gln471Ter);
Family C - sibs compound het for c.1228T>G (p.Phe410Val) and c.1251_1252insTAA (p.Thr418Ter);
Family D - affected individuals (1 fetal case) homozygous for c.1366G>C (p.Asp456His) - shown to impact splicing (r.406_442del), resulting in predicted p.Ser136LeufsTer19 change;
Family E - affected child with homozygous c.835C>T (p.Arg279Ter) change;
Family F - fetus homozygous for c.1260G>A (p.Trp420Ter);

Functional evidence: Fsd1l depletion in mouse embryos recapitulated the ventricular dilation observed in affected fetuses.

PMID 41720099 Lin et al., 2026
Report of 6 affected individuals from 4 families with retinitis pigmentosa. One individual underwent a full neurological evaluation, including brain neuroimaging, which revealed no evidence of central nervous system involvement.
FSD1L variants detected:
Family A: 2 sibs compound het for c.1049G>A (p.Arg350Gln) and c.1428del (p.Phe476Leufs∗22)
Family B: individual comp het for c.488G>A (p.Arg163His), c.488G>A & c.745C>T (p.Arg249∗)
Family C: 2 sibs compound het for c.488G>A (p.Arg163His) & c.226_227del (p.Ser77Argfs∗4)
Family D: individual compound het for c.1037_1038delinsT (p.Pro346Leufs∗8) and c.1025+624_1025+649del
Sibs from family A had mild neurological involvement (mild ID, spastic diplegia in one sibling).
Authors note that "specific combination and functional severity of the two alleles likely determines the clinical outcome", with non-LoF variants causing a milder effect (e.g., isolated retinal phenotype).

FSD1L is not yet associated with a phenotype in OMIM or Gene2Phenotype.
Sources: Literature
Optic neuropathy v5.47 BORCS5 Ida Ertmanska gene: BORCS5 was added
gene: BORCS5 was added to Optic neuropathy. Sources: Literature
Mode of inheritance for gene: BORCS5 was set to BIALLELIC, autosomal or pseudoautosomal
Publications for gene: BORCS5 were set to 27435318; 40385417; 40621786
Phenotypes for gene: BORCS5 were set to arthrogryposis multiplex congenita, MONDO:0015168; neurodevelopmental disorder, MONDO:0700092
Review for gene: BORCS5 was set to GREEN
Added comment: PMID: 40621786 Fisher et al., 2025
Report of 2 fetal cases in a consanguineous Pakistani family. Exome seq revealed a homozygous nonsense variant c.283C>T, p.(Arg95Ter) in BORCS5 (NM_058169.4). Individuals showed neuroaxonal dystrophy with osteopetrosis.

PMID: 40385417 Mencacci et al., 2025 - pre-print
Report of 12 individuals from 7 unrelated families with biallelic BORCS5 variants (NM_058169.4): two missense variants (c.284G>A, p.R95Q; c.296A>C, p.H99P) and four LoF alleles (c.203–1G>T, p.?; c.316delG, p.A106Pfs*20; c.382_383delAG, p.L128Vfs*86; c.417C>G, p.Y139*).
Table 1 = phenotypic spectrum of 6 individuals from families 1-4: profound ID (6/6), severe spasticity (6/6), seizures (6/6), hyperreflexia (6/6), Parkinsonism/dystonia (3/6), limb contractures (5/6), optic atrophy (5/6), abnormal brain MRI including cerebral atrophy and/or corpus callosum agenesis (5/6), microcephaly (6/6 - severity not stated), muscle atrophy (5/6). Infantile onset.
Neuroimaging in 5 cases showed cerebral atrophy, white matter loss, hypomyelination, small T2-hypointense thalami, thin brainstem, and optic nerve atrophy.

PMID: 27435318 Charng et al., 2016
Patient BAB6775 homozygous for NM_058169.4 BORCS5: c.203-1G>T, with DD, microcephaly, seizures, cortical malformations, polymicrogyria, agenesis of corpus callosum. Also reported with more details in PMID:40385417 (do not count).

Additional functional evidence: Zebrafish borcs5 knockout leads to neurodevelopmental defects:microcephaly, ventriculomegaly, movement disorders and epilepsy.

BORCS5 is not yet associated with a disease in OMIM (accessed 20th Feb 2026).
Sources: Literature
Optic neuropathy v4.40 MAG Achchuthan Shanmugasundram Tag Q1_23_promote_green was removed from gene: MAG.
Optic neuropathy v4.40 MAG Achchuthan Shanmugasundram reviewed gene: MAG: Rating: GREEN; Mode of pathogenicity: ; Publications: ; Phenotypes: ; Mode of inheritance: BIALLELIC, autosomal or pseudoautosomal
Optic neuropathy v4.39 MAG Achchuthan Shanmugasundram Source Expert Review Green was added to MAG.
Rating Changed from Amber List (moderate evidence) to Green List (high evidence)
Optic neuropathy v3.11 MAG Arina Puzriakova Entity copied from Hereditary spastic paraplegia - childhood onset v3.18
Optic neuropathy v3.11 MAG Arina Puzriakova gene: MAG was added
gene: MAG was added to Optic neuropathy. Sources: Yorkshire and North East GLH,London North GLH,Literature,Expert Review Amber,NHS GMS
Q1_23_promote_green tags were added to gene: MAG.
Mode of inheritance for gene: MAG was set to BIALLELIC, autosomal or pseudoautosomal
Publications for gene: MAG were set to 24482476; 26179919; 31402626; 32629324; 32340215
Phenotypes for gene: MAG were set to Spastic paraplegia 75, autosomal recessive, OMIM:616680