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Mendeliome v1.2154 PPP5C Lucy Spencer gene: PPP5C was added
gene: PPP5C was added to Mendeliome. Sources: Literature
Mode of inheritance for gene: PPP5C was set to MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted
Publications for gene: PPP5C were set to 35361529; 25363768; 33057194
Phenotypes for gene: PPP5C were set to Neurodevelopmental disorder, MONDO:0700092, PPP5C-related
Review for gene: PPP5C was set to AMBER
Added comment: PMID: 35361529 - reported a de novo missense in a proband with microcephaly, developmental delay and epilepsy. However, after personal communication with the undiagnosed disease network this proband has since been found to have a different diagnosis with a nonsense and a missense in VARS1 identified, so unclear if the PPP5C variant is contributing to their phenotype.

3 more probands with de novo missense variants have been published in large autism or developmental disorder cohort with limited information (PMIDs: 25363768, 33057194)

An internal VCGS proband with intellectual disability and failure to thrive was also found to have a de novo missense variant in this gene.
Sources: Literature
Mendeliome v1.2150 GARS Zornitza Stark Phenotypes for gene: GARS were changed from Spinal muscular atrophy, infantile, James type, MIM# 619042; Charcot-Marie-Tooth disease, type 2D, MIM# 601472; Neuronopathy, distal hereditary motor, type VA, MIM# 600794; Multi-system mitochondrial disorder to Mitochondrial disease (MONDO:0044970), GARS1-related; Spinal muscular atrophy, infantile, James type, MIM# 619042; Charcot-Marie-Tooth disease, type 2D, MIM# 601472; Neuronopathy, distal hereditary motor, type VA, MIM# 600794; Multi-system mitochondrial disorder
Mendeliome v1.2149 GARS Zornitza Stark edited their review of gene: GARS: Changed phenotypes: Mitochondrial disease (MONDO:0044970), GARS1-related, Spinal muscular atrophy, infantile, James type, MIM# 619042, Charcot-Marie-Tooth disease, type 2D, MIM# 601472, Neuronopathy, distal hereditary motor, type VA, MIM# 600794, Multi-system mitochondrial disorder
Mendeliome v1.619 SARS Zornitza Stark Phenotypes for gene: SARS were changed from neurodevelopmental disorder MONDO#070009, SARS1-related to neurodevelopmental disorder MONDO#070009, SARS1-related; Genetic peripheral neuropathy MONDO#0020127, SARS1-related
Mendeliome v1.361 SARS Ee Ming Wong edited their review of gene: SARS: Added comment: -Two missense variants within the aminoacylation domain identified in 16 affected individuals from 3 distinct CMT families
-Mutant SerRS proteins exhibited reduced aminoacylation activity and abnormal SerRS dimerization, which suggests the impairment of total protein synthesis and induction of eIF2α phosphorylation; Changed rating: GREEN; Changed publications: 36088542; Changed phenotypes: Genetic peripheral neuropathy MONDO#0020127, SARS1-related
Mendeliome v1.289 SARS Ee Ming Wong reviewed gene: SARS: Rating: RED; Mode of pathogenicity: Other; Publications: 36041817; Phenotypes: neurodevelopmental disorder, MONDO#070009, SARS1-related; Mode of inheritance: MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted; Current diagnostic: yes
Mendeliome v1.222 SARS Ain Roesley Phenotypes for gene: SARS were changed from Intellectual disability to neurodevelopmental disorder MONDO#070009, SARS1-related
Mendeliome v1.220 SARS Ain Roesley reviewed gene: SARS: Rating: GREEN; Mode of pathogenicity: None; Publications: 35790048; Phenotypes: neurodevelopmental disorder MONDO#070009, SARS1-related; Mode of inheritance: BIALLELIC, autosomal or pseudoautosomal; Current diagnostic: yes
Mendeliome v0.14163 FRRS1L Bryony Thompson Marked gene: FRRS1L as ready
Mendeliome v0.14163 FRRS1L Bryony Thompson Gene: frrs1l has been classified as Green List (High Evidence).
Mendeliome v0.14163 FRRS1L Bryony Thompson Phenotypes for gene: FRRS1L were changed from to Developmental and epileptic encephalopathy, 37 MONDO:0014859
Mendeliome v0.14160 FRRS1L Bryony Thompson Publications for gene: FRRS1L were set to
Mendeliome v0.14159 FRRS1L Bryony Thompson Mode of inheritance for gene: FRRS1L was changed from Unknown to BIALLELIC, autosomal or pseudoautosomal
Mendeliome v0.14158 FRRS1L Bryony Thompson reviewed gene: FRRS1L: Rating: GREEN; Mode of pathogenicity: None; Publications: 27236917, 27239025, 30692144; Phenotypes: Developmental and epileptic encephalopathy, 37 MONDO:0014859; Mode of inheritance: BIALLELIC, autosomal or pseudoautosomal
Mendeliome v0.11468 IRS1 Zornitza Stark Marked gene: IRS1 as ready
Mendeliome v0.11468 IRS1 Zornitza Stark Gene: irs1 has been classified as Red List (Low Evidence).
Mendeliome v0.11468 IRS1 Zornitza Stark Phenotypes for gene: IRS1 were changed from to {Coronary artery disease, susceptibility to}; {Type 2 diabetes mellitus, susceptibility to}, MIM# 125853
Mendeliome v0.11467 IRS1 Zornitza Stark Classified gene: IRS1 as Red List (low evidence)
Mendeliome v0.11467 IRS1 Zornitza Stark Gene: irs1 has been classified as Red List (Low Evidence).
Mendeliome v0.11466 IRS1 Zornitza Stark reviewed gene: IRS1: Rating: RED; Mode of pathogenicity: None; Publications: ; Phenotypes: {Coronary artery disease, susceptibility to}, {Type 2 diabetes mellitus, susceptibility to}, MIM# 125853; Mode of inheritance: None
Mendeliome v0.10570 AARS Zornitza Stark edited their review of gene: AARS: Added comment: PMID 31775912: single multigenerational family with leukoencephalopathy segregating AARS1 variant.; Changed publications: 28493438, 25817015, 20045102, 22009580, 22206013, 30373780, 26032230, 31775912; Changed phenotypes: Epileptic encephalopathy, early infantile, 29, MIM# 616339, Charcot-Marie-Tooth disease, axonal, type 2N, MIM# 613287, Leukoencephalopathy, hereditary diffuse, with spheroids 2, MIM# 619661
Mendeliome v0.9354 MARS Zornitza Stark Added comment: Comment when marking as ready: New HGNC approved gene name is MARS1.
Mendeliome v0.9351 MARS Zornitza Stark changed review comment from: Association with CMT: Two families reported. One mutation positive family member was asymptomatic. Second case is proband only testing with no segregation or functional data. Note one of the variants identified in dominant MARS1-associated neuropathy, p.Arg618Cys, has also been reported in AR MARS1-related pulmonary interstiatial/liver disease.; to: Association with CMT and mono-allelic variants: Two families reported. One mutation positive family member was asymptomatic. Second case is proband only testing with no segregation or functional data. Note one of the variants identified in dominant MARS1-associated neuropathy, p.Arg618Cys, has also been reported in AR MARS1-related pulmonary interstiatial/liver disease.
Mendeliome v0.9351 MARS Zornitza Stark changed review comment from: Two families reported. One mutation positive family member was asymptomatic. Second case is proband only testing with no segregation or functional data. Note one of the variants identified in dominant MARS1-associated neuropathy, p.Arg618Cys, has also been reported in AR MARS1-related pulmonary interstiatial/liver disease.; to: Association with CMT: Two families reported. One mutation positive family member was asymptomatic. Second case is proband only testing with no segregation or functional data. Note one of the variants identified in dominant MARS1-associated neuropathy, p.Arg618Cys, has also been reported in AR MARS1-related pulmonary interstiatial/liver disease.
Mendeliome v0.9347 AARS Eleanor Williams changed review comment from: PMID: 33909043 - Botta et al 2021 - using WES or WGS analysis of 34 unsolved cases with multi-system phenotypes, but with hair alterations that are typical of trichothiodystrophy but no reported photosensitivity, they identified 2 unrelated cases carrying 4 potentially pathogenic variants in the AARS1 gene (previously known as AARSB. Both patients had very rare compound heterozygous missense variants. In one family there was an older affected sibling but segregation data was not available for either family.; to: PMID: 33909043 - Botta et al 2021 - using WES or WGS analysis of 34 unsolved cases with multi-system phenotypes, but with hair alterations that are typical of trichothiodystrophy but no reported photosensitivity, they identified 2 unrelated cases carrying 4 potentially pathogenic variants in the AARS1 gene (previously known as AARSB. Both patients had very rare compound heterozygous missense variants. In one family there was an older affected sibling but segregation data was not available for either family. Functional studies suggest that the variants affects gene product stability.
Mendeliome v0.8853 PLAG1 Zornitza Stark edited their review of gene: PLAG1: Added comment: Additional families reported, upgrade to Green.

Silver-Russell syndrome-4 (SRS4) is characterised by intrauterine growth retardation followed by feeding difficulties and postnatal growth restriction. Dysmorphic facial features include triangular face and prominent forehead, and relative macrocephaly at birth may be observed. So far 4 families have been reported with some functional studies of the role of the gene in the growth pathway.

Abi Habib et al. (2018) reported 1 family (child, sister and mother) patient with Silver-Russell syndrome (with normal methylation on chromosomes 7, 11, and 14, and exclusion of maternal UPD and chromosomal rearrangements). Using WES they identified a heterozygous 1-bp deletion in the PLAG1 gene. The variant segregated with disease, and was not present in polymorphism databases or ExAC. They also reported another patient with a different heterozygous 1-bp deletion in the PLAG1 gene. This was not found in her unaffected twin brother, older brother, or parents. Experiments in Hep3b cells demonstrated that PLAG1 positively regulates expression of the IGF2 promoter P3, independently and via the HMGA2-PLAG1-IGF2 pathway. Disruption of any gene in the pathway results in a decrease in IGF2 expression and produces an SRS phenotype similar to that of patients carrying 11p15.5 epigenetic defects (SRS1; 180860), except for body asymmetry, which is not expected to occur since the molecular defects are present in all cells of the body, unlike the mosaic epigenetic changes at the 11p15.5 locus.

Inoue et al. (2020) reported 1 family with 2 affected people with Silver-Russell syndrome with a nonsense variant in the PLAG1 gene, which segregated with disease.

Vado et al. (2020) reported 1 family with multiple affected people with Silver-Russell syndrome with a frameshift variant in the PLAG1 gene, which segregated with disease.; Changed rating: GREEN; Changed publications: 28796236, 29913240, 33291420, 32546215
Mendeliome v0.7993 FARSA Zornitza Stark edited their review of gene: FARSA: Added comment: Schuch et al. (2021) report 3 unrelated individuals with bi-allelic variants in FARSA. Identified through WES and variants segregated with disease. Functional evidence was obtained with reduced FARS1 enzyme activity levels in fibroblasts or EBV-transformed lymphoblastoid cell lines (EBV-LCLs) of patients. Common to all was a chronic interstitial lung disease starting early in life and characterized by bilateral ground-glass opacification on HR-CT, and cholesterol pneumonitis in lung histology. Additional abnormalities in other organ systems include liver disease, neurological manifestations, and growth restriction.; Changed rating: GREEN; Changed publications: 31355908, 33598926; Changed phenotypes: Rajab interstitial lung disease with brain calcifications 2, MIM# 619013
Mendeliome v0.3643 NARS Zornitza Stark gene: NARS was added
gene: NARS was added to Mendeliome. Sources: Literature
Mode of inheritance for gene: NARS was set to BOTH monoallelic and biallelic, autosomal or pseudoautosomal
Publications for gene: NARS were set to 32738225
Phenotypes for gene: NARS were set to Abnormal muscle tone; Microcephaly; Global developmental delay; Intellectual disability; Seizures; Ataxia; Abnormality of the face; Demyelinating peripheral neuropathy
Review for gene: NARS was set to GREEN
Added comment: [Please note that HGNC Approved Gene Symbol for this gene is NARS1] Manole et al (2020 - PMID: 32738225) provide evidence that both biallelic and monoallelic (de novo) pathogenic NARS1 variants cause a neurodevelopmental disorder. In total 32 individuals from 21 families are reported, with biallelic variants identified in individuals from 13 families and de novo in 8 families. Similar features were reported for AR/AD occurrences of the disorder and included microcephaly (90% - most often primary), epilepsy (23/32 or 74% - variable semiology incl. partial/myoclonic/generalized tonic-clonic seizures), DD and ID (as a universal feature), abnormal tone in several (hypotonia/spasticity), ataxia, demyelinating peripheral neuropathy (in 3 or more for each inheritance mode - or a total of 25%). Some individuals had dysmorphic features. NARS1 encodes an aminoacyl-tRNA synthetase (ARS) [asparaginyl-tRNA synthetase 1]. Aminoacyl-tRNA synthetases constitute a family of enzymes catalyzing attachment of amino-acids to their cognate tRNAs. As the authors comment, mutations in genes encoding several other ARSs result in neurological disorders ranging from peripheral neuropathy to severe multi-systemic NDD. Dominant, recessive or both modes for inheritance for mutations in the same gene (e.g. AARS1, YARS1, MARS1, etc) have been reported. Some variants were recurrent, e.g. the c.1600C>T / p.Arg534* which occurred in 6 families as a de novo event or c.1633C>T p.Arg545Cys (homozygous in 6 families). 3 different variants were reported to have occured de novo (c.965G>T - p.Arg322Leu, c.1525G>A - p.Gly509Ser, p.Arg534*) with several other variants identified in hmz/compound htz individuals. A single SNV (c.1067A>C - p.Asp356Ala) was suggested to be acting as modifier and pathogenic only when in trans with a severe variant. [NM_004539.4 used as RefSeq for all]. The authors provide several lines of evidence for a partial loss-of-function effect (e.g. reduction in mRNA expression, enzyme levels and activity in fibroblasts or iNPCs) underlying pathogenicity of the variants identified in individuals with biallelic variants. A gain-of-function (dominant-negative) effect is proposed for de novo variants (such effect also demonstrated for the p.Arg534* in a zebrafish model).
Sources: Literature
Mendeliome v0.3539 LARS Zornitza Stark Added comment: Comment when marking as ready: Lenz et al (2020 - PMID: 32699352) review the phenotype of 25 affected individuals from 15 families.

Seizures occurred in 19/24 and were commonly associated with infections. Encephalopathic episodes (in 13 patients) accompanied by seizures up to status epilepticus occurred independently of hepatic decompensation.

In addition 22/24 presented with neurodevelopmental delay. The authors comment that cognitive impairment was present in 13/17 individuals (mild-severe) whereas most presented with learning disabilities.

These patients will most likely investigated for their liver disease (although presentation was highly variable and/or very mild in few).

The gene encodes a cytoplasmic amino-acyl tRNA synthetase (ARS) with neurologic manifestations observed in almost all patients (and seizures / DD and ID common to other disorders due to mutations in other genes encoding for ARSs).

Please note that the HGNC approved symbol for this gene is LARS1.
Mendeliome v0.1609 RS1 Zornitza Stark Marked gene: RS1 as ready
Mendeliome v0.1609 RS1 Zornitza Stark Gene: rs1 has been classified as Green List (High Evidence).
Mendeliome v0.1609 RS1 Zornitza Stark Phenotypes for gene: RS1 were changed from to Retinoschisis, MIM#312700
Mendeliome v0.1608 RS1 Zornitza Stark Publications for gene: RS1 were set to
Mendeliome v0.1607 RS1 Zornitza Stark Mode of inheritance for gene: RS1 was changed from Unknown to X-LINKED: hemizygous mutation in males, biallelic mutations in females
Mendeliome v0.1590 RS1 Kristin Rigbye reviewed gene: RS1: Rating: GREEN; Mode of pathogenicity: None; Publications: 15932525, 23453514, 23847049; Phenotypes: Retinoschisis, 312700; Mode of inheritance: X-LINKED: hemizygous mutation in males, biallelic mutations in females
Mendeliome v0.0 RS1 Zornitza Stark gene: RS1 was added
gene: RS1 was added to Mendeliome_VCGS. Sources: Expert Review Green,Victorian Clinical Genetics Services
Mode of inheritance for gene: RS1 was set to Unknown
Mendeliome v0.0 IRS1 Zornitza Stark gene: IRS1 was added
gene: IRS1 was added to Mendeliome_VCGS. Sources: Expert Review Green,Victorian Clinical Genetics Services
Mode of inheritance for gene: IRS1 was set to Unknown
Mendeliome v0.0 FRRS1L Zornitza Stark gene: FRRS1L was added
gene: FRRS1L was added to Mendeliome_VCGS. Sources: Expert Review Green,Victorian Clinical Genetics Services
Mode of inheritance for gene: FRRS1L was set to Unknown