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Mendeliome v1.4786 RPL4 Zornitza Stark Marked gene: RPL4 as ready
Mendeliome v1.4786 RPL4 Zornitza Stark Gene: rpl4 has been classified as Red List (Low Evidence).
Mendeliome v1.4786 Zornitza Stark Copied gene RPL4 from panel Diamond Blackfan anaemia
Mendeliome v1.4786 RPL4 Zornitza Stark gene: RPL4 was added
gene: RPL4 was added to Mendeliome. Sources: Expert Review Red,Literature
Mode of inheritance for gene: RPL4 was set to MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown
Publications for gene: RPL4 were set to 30213830
Phenotypes for gene: RPL4 were set to Diamond Blackfan anaemia, MONDO:0015253, RPL4-related
Mendeliome v1.2698 LONP1 Lauren Rogers changed review comment from: ew reports of autosomal dominant mitochondrial disease due to missense variants at p.Arg301.

- PMID: 36353900; Hartley 2023: 1x heterozygous de novo individual with p.(Arg301Gln), with dystonia, hearing loss, seizures.
p.(Arg301Gln) has been reported as de novo in a heterozygous individual with dystonia, delayed speech and language development (VCGS/MCRI internal case)

- PMID: 31923470; Besse 2020: 1x heterozygous de novo individual with p.(Arg301Trp) with seizures, encephalopathy, pachygyria and microcephaly.
- p.(Arg301Trp) has also been reported in a heterozygous individual with recurrent neonatal seizures, suspected mitochondrial disorder, elevated lactate, microcephaly, EEG showing significantly increased seizure susceptibility which was de novo but parentage not tested (ClinVar, personal communication).
- p.(Arg301Trp) has also been identified in a heterozygous individual with neonatal intractable epileptic encephalopathy and lactic acidosis. MRI changes in keeping with mitochondrial disorder, a combined Complex I and complex IV defect identified in muscle (but not liver) by RCE (VCGS/MCRI internal case)

- p.(Arg301Gly) has been reported de novo in a heterozygous individual with epileptic encephalopathy, microcephaly and dyskinesia (ClinVar, personal communication)

LONP1 functions as both a chaperone and an ATP-dependent protease. Functional evidence in Besse shows p.(Arg301Trp) results in loss of chaperone activity but retains proteolytic activity. Expression of WT LONP1 in patient fibroblast cells did not rescue dysfunction (measured via levels of MRPL44, RPL11, PDHE1a, TFAM, PINK1, complex 1 and complex IV) - indicating NOT LoF effect. Overexpression of LONP1 in control fibroblast cells leads to dysfunction (decrease in NDUFB8, COXIV, MRPL44 and TFAM), however, MRPL11, PDHE1a and PINK1 proteins were unchanged compared to controls. Variant p.R721G associated with AR disease showed decreased homo-oligomerisation whilst p.R301W showed increased WT-Mut and WT-WT oligomers. GoF was suggested but no dose-dependent studies so DN cannot be excluded.; to: New reports of autosomal dominant mitochondrial disease due to missense variants at p.Arg301.

- PMID: 36353900; Hartley 2023: 1x heterozygous de novo individual with p.(Arg301Gln), with dystonia, hearing loss, seizures.
p.(Arg301Gln) has been reported as de novo in a heterozygous individual with dystonia, delayed speech and language development (VCGS/MCRI internal case)

- PMID: 31923470; Besse 2020: 1x heterozygous de novo individual with p.(Arg301Trp) with seizures, encephalopathy, pachygyria and microcephaly.
- p.(Arg301Trp) has also been reported in a heterozygous individual with recurrent neonatal seizures, suspected mitochondrial disorder, elevated lactate, microcephaly, EEG showing significantly increased seizure susceptibility which was de novo but parentage not tested (ClinVar, personal communication).
- p.(Arg301Trp) has also been identified in a heterozygous individual with neonatal intractable epileptic encephalopathy and lactic acidosis. MRI changes in keeping with mitochondrial disorder, a combined Complex I and complex IV defect identified in muscle (but not liver) by RCE (VCGS/MCRI internal case)

- p.(Arg301Gly) has been reported de novo in a heterozygous individual with epileptic encephalopathy, microcephaly and dyskinesia (ClinVar, personal communication)

LONP1 functions as both a chaperone and an ATP-dependent protease. Functional evidence in Besse shows p.(Arg301Trp) results in loss of chaperone activity but retains proteolytic activity. Expression of WT LONP1 in patient fibroblast cells did not rescue dysfunction (measured via levels of MRPL44, RPL11, PDHE1a, TFAM, PINK1, complex 1 and complex IV) - indicating NOT LoF effect. Overexpression of LONP1 in control fibroblast cells leads to dysfunction (decrease in NDUFB8, COXIV, MRPL44 and TFAM), however, MRPL11, PDHE1a and PINK1 proteins were unchanged compared to controls. Variant p.R721G associated with AR disease showed decreased homo-oligomerisation whilst p.R301W showed increased WT-Mut and WT-WT oligomers. GoF was suggested but no dose-dependent studies so DN cannot be excluded.
Mendeliome v1.2698 LONP1 Lauren Rogers commented on gene: LONP1: ew reports of autosomal dominant mitochondrial disease due to missense variants at p.Arg301.

- PMID: 36353900; Hartley 2023: 1x heterozygous de novo individual with p.(Arg301Gln), with dystonia, hearing loss, seizures.
p.(Arg301Gln) has been reported as de novo in a heterozygous individual with dystonia, delayed speech and language development (VCGS/MCRI internal case)

- PMID: 31923470; Besse 2020: 1x heterozygous de novo individual with p.(Arg301Trp) with seizures, encephalopathy, pachygyria and microcephaly.
- p.(Arg301Trp) has also been reported in a heterozygous individual with recurrent neonatal seizures, suspected mitochondrial disorder, elevated lactate, microcephaly, EEG showing significantly increased seizure susceptibility which was de novo but parentage not tested (ClinVar, personal communication).
- p.(Arg301Trp) has also been identified in a heterozygous individual with neonatal intractable epileptic encephalopathy and lactic acidosis. MRI changes in keeping with mitochondrial disorder, a combined Complex I and complex IV defect identified in muscle (but not liver) by RCE (VCGS/MCRI internal case)

- p.(Arg301Gly) has been reported de novo in a heterozygous individual with epileptic encephalopathy, microcephaly and dyskinesia (ClinVar, personal communication)

LONP1 functions as both a chaperone and an ATP-dependent protease. Functional evidence in Besse shows p.(Arg301Trp) results in loss of chaperone activity but retains proteolytic activity. Expression of WT LONP1 in patient fibroblast cells did not rescue dysfunction (measured via levels of MRPL44, RPL11, PDHE1a, TFAM, PINK1, complex 1 and complex IV) - indicating NOT LoF effect. Overexpression of LONP1 in control fibroblast cells leads to dysfunction (decrease in NDUFB8, COXIV, MRPL44 and TFAM), however, MRPL11, PDHE1a and PINK1 proteins were unchanged compared to controls. Variant p.R721G associated with AR disease showed decreased homo-oligomerisation whilst p.R301W showed increased WT-Mut and WT-WT oligomers. GoF was suggested but no dose-dependent studies so DN cannot be excluded.
Mendeliome v1.2590 MRPL49 Zornitza Stark Phenotypes for gene: MRPL49 were changed from Mitochondrial disease, MONDO:0044970, MRPL49-related to Combined oxidative phosphorylation deficiency 60, MIM# 621195
Mendeliome v1.2589 MRPL49 Zornitza Stark edited their review of gene: MRPL49: Changed phenotypes: Combined oxidative phosphorylation deficiency 60, MIM# 621195
Mendeliome v1.2092 MRPL49 Zornitza Stark Marked gene: MRPL49 as ready
Mendeliome v1.2092 MRPL49 Zornitza Stark Gene: mrpl49 has been classified as Green List (High Evidence).
Mendeliome v1.2092 MRPL49 Zornitza Stark Classified gene: MRPL49 as Green List (high evidence)
Mendeliome v1.2092 MRPL49 Zornitza Stark Gene: mrpl49 has been classified as Green List (High Evidence).
Mendeliome v1.2091 MRPL49 Zornitza Stark gene: MRPL49 was added
gene: MRPL49 was added to Mendeliome. Sources: Literature
Mode of inheritance for gene: MRPL49 was set to BIALLELIC, autosomal or pseudoautosomal
Publications for gene: MRPL49 were set to 39417135
Phenotypes for gene: MRPL49 were set to Mitochondrial disease, MONDO:0044970, MRPL49-related
Review for gene: MRPL49 was set to GREEN
Added comment: Five unrelated families with presentations ranging from Perrault syndrome (primary ovarian insufficiency and sensorineural hearing loss) to severe childhood onset of leukodystrophy, learning disability, microcephaly and retinal dystrophy and bi-allelic variants in this gene.
Sources: Literature
Mendeliome v1.2005 MRPL42 Bryony Thompson Marked gene: MRPL42 as ready
Mendeliome v1.2005 MRPL42 Bryony Thompson Gene: mrpl42 has been classified as Red List (Low Evidence).
Mendeliome v1.2005 MRPL42 Bryony Thompson Classified gene: MRPL42 as Red List (low evidence)
Mendeliome v1.2005 MRPL42 Bryony Thompson Gene: mrpl42 has been classified as Red List (Low Evidence).
Mendeliome v1.1998 MRPL42 Mark Cleghorn gene: MRPL42 was added
gene: MRPL42 was added to Mendeliome. Sources: Other
Mode of inheritance for gene: MRPL42 was set to BIALLELIC, autosomal or pseudoautosomal
Phenotypes for gene: MRPL42 were set to complex neurodevelopmental disorder MONDO:0100038
Penetrance for gene: MRPL42 were set to unknown
Review for gene: MRPL42 was set to RED
Added comment: Bjorn Fischer-Zirnsak, Charite Berlin
ESHG presentation 4/6/24, unpublished

++ supportive functional data (on patient-derived cells) presented, but only 1 case

Biallelic MRPL42 LoF with lethal mitochondrial disease

Index case, born to consanguineous parents
Small
Hypotonia
Seizures
Conductive hearing impairment
CV: hypertrophic RV, small VSD
Hepatomegaly
Lactic acidosis

Homozygous MRPL42: c.219+6T>A (spliceAI 0.83 donor loss)
RNASeq and RT-PCR supportive of aberrant splicing resulting in out of frame exon 4 skipping
Sources: Other
Mendeliome v0.3969 MRPL44 Zornitza Stark Marked gene: MRPL44 as ready
Mendeliome v0.3969 MRPL44 Zornitza Stark Gene: mrpl44 has been classified as Green List (High Evidence).
Mendeliome v0.3969 MRPL44 Zornitza Stark Phenotypes for gene: MRPL44 were changed from to Combined oxidative phosphorylation deficiency 16, MIM# 615395
Mendeliome v0.3968 MRPL44 Zornitza Stark Publications for gene: MRPL44 were set to
Mendeliome v0.3967 MRPL44 Zornitza Stark Mode of inheritance for gene: MRPL44 was changed from Unknown to BIALLELIC, autosomal or pseudoautosomal
Mendeliome v0.3966 MRPL44 Zornitza Stark reviewed gene: MRPL44: Rating: GREEN; Mode of pathogenicity: None; Publications: 23315540, 25797485; Phenotypes: Combined oxidative phosphorylation deficiency 16, MIM# 615395; Mode of inheritance: BIALLELIC, autosomal or pseudoautosomal
Mendeliome v0.0 MRPL44 Zornitza Stark gene: MRPL44 was added
gene: MRPL44 was added to Mendeliome_VCGS. Sources: Expert Review Green,Victorian Clinical Genetics Services
Mode of inheritance for gene: MRPL44 was set to Unknown