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Childhood onset dystonia, chorea or related movement disorder v3.53 ARX Sarah Leigh changed review comment from: A review by Eldar Dedic (Independent Clinical Genetics Consultant)
Kwong, et al. (2019, PMID: 31324350) presented a Chinese family with infantile epileptic dyskinetic encephalopathy. The whole-exome-sequencing revealed ARX c.989G>A (p.Arg330His) in 13 years of age affected proband (who also suffered from dystonia), as well as in his unaffected mother and sister. Proband also had a healthy older brother who did not carry the variant. The proband’s muscle whole mitochondrial DNA analysis did not show the presence of a pathogenic variant. - Please note that ARX c.989G>A (p.Arg330His) was absent from gnomAD v2.1.1 as of December 2021 Gorman, et al. (2018, PMID: 29778428) presented 2 years of age Ohtahara syndrome male case of Romanian origin. Whole-exome-sequencing revealed ARX c.1600G>C (p.Ala534Pro) variant in a patient (who also had dystonia) and in his healthy mother (who was a low-level mosaic). The proband was negative for chromosomal array testing and had a normal brain MRI. - Please note that ARX c.1600G>C (p.Ala534Pro) was absent from gnomAD v2.1.1 as of December 2021 Charzewska, et al. (2013, PMID: 23657928) presented a family with intellectual disability and dystonia. Sequencing of ARX revealed the presence of c.4A>T (p.Ser2Cys) variant in 4 affected males (including 2 who had onset of dystonia at 2nd day of life and 12 years of age, respectively) and in 5 female carriers. - Please note that ARX c.4A>T (p.Ser2Cys) was absent from gnomAD v2.1.1 as of December 2021 Breen, et al. (2018, PMID: 29343471) presented 12 years of age male case with intellectual disability and hand dystonia. The ARX c.426_458dup (p.Gly143_Ala153dup) variant has been reported in the proband, his cousin and maternal uncle from Pakistan, both of which had hand dystonia, as well as in his unaffected mother. The patient had whole-exome-sequencing as one of the previous tests carried out. - Please note that ARX c.426_458dup (p.Gly143_Ala153dup) was absent from gnomAD v2.1.1 as of December 2021; to: A review by Eldar Dedic (Independent Clinical Genetics Consultant):
Kwong, et al. (2019, PMID: 31324350) presented a Chinese family with infantile epileptic dyskinetic encephalopathy. The whole-exome-sequencing revealed ARX c.989G>A (p.Arg330His) in 13 years of age affected proband (who also suffered from dystonia), as well as in his unaffected mother and sister. Proband also had a healthy older brother who did not carry the variant. The proband’s muscle whole mitochondrial DNA analysis did not show the presence of a pathogenic variant. - Please note that ARX c.989G>A (p.Arg330His) was absent from gnomAD v2.1.1 as of December 2021 Gorman, et al. (2018, PMID: 29778428) presented 2 years of age Ohtahara syndrome male case of Romanian origin. Whole-exome-sequencing revealed ARX c.1600G>C (p.Ala534Pro) variant in a patient (who also had dystonia) and in his healthy mother (who was a low-level mosaic). The proband was negative for chromosomal array testing and had a normal brain MRI. - Please note that ARX c.1600G>C (p.Ala534Pro) was absent from gnomAD v2.1.1 as of December 2021 Charzewska, et al. (2013, PMID: 23657928) presented a family with intellectual disability and dystonia. Sequencing of ARX revealed the presence of c.4A>T (p.Ser2Cys) variant in 4 affected males (including 2 who had onset of dystonia at 2nd day of life and 12 years of age, respectively) and in 5 female carriers. - Please note that ARX c.4A>T (p.Ser2Cys) was absent from gnomAD v2.1.1 as of December 2021 Breen, et al. (2018, PMID: 29343471) presented 12 years of age male case with intellectual disability and hand dystonia. The ARX c.426_458dup (p.Gly143_Ala153dup) variant has been reported in the proband, his cousin and maternal uncle from Pakistan, both of which had hand dystonia, as well as in his unaffected mother. The patient had whole-exome-sequencing as one of the previous tests carried out. - Please note that ARX c.426_458dup (p.Gly143_Ala153dup) was absent from gnomAD v2.1.1 as of December 2021
Childhood onset dystonia, chorea or related movement disorder v3.53 ARX Sarah Leigh commented on gene: ARX: A review by Eldar Dedic (Independent Clinical Genetics Consultant)
Kwong, et al. (2019, PMID: 31324350) presented a Chinese family with infantile epileptic dyskinetic encephalopathy. The whole-exome-sequencing revealed ARX c.989G>A (p.Arg330His) in 13 years of age affected proband (who also suffered from dystonia), as well as in his unaffected mother and sister. Proband also had a healthy older brother who did not carry the variant. The proband’s muscle whole mitochondrial DNA analysis did not show the presence of a pathogenic variant. - Please note that ARX c.989G>A (p.Arg330His) was absent from gnomAD v2.1.1 as of December 2021 Gorman, et al. (2018, PMID: 29778428) presented 2 years of age Ohtahara syndrome male case of Romanian origin. Whole-exome-sequencing revealed ARX c.1600G>C (p.Ala534Pro) variant in a patient (who also had dystonia) and in his healthy mother (who was a low-level mosaic). The proband was negative for chromosomal array testing and had a normal brain MRI. - Please note that ARX c.1600G>C (p.Ala534Pro) was absent from gnomAD v2.1.1 as of December 2021 Charzewska, et al. (2013, PMID: 23657928) presented a family with intellectual disability and dystonia. Sequencing of ARX revealed the presence of c.4A>T (p.Ser2Cys) variant in 4 affected males (including 2 who had onset of dystonia at 2nd day of life and 12 years of age, respectively) and in 5 female carriers. - Please note that ARX c.4A>T (p.Ser2Cys) was absent from gnomAD v2.1.1 as of December 2021 Breen, et al. (2018, PMID: 29343471) presented 12 years of age male case with intellectual disability and hand dystonia. The ARX c.426_458dup (p.Gly143_Ala153dup) variant has been reported in the proband, his cousin and maternal uncle from Pakistan, both of which had hand dystonia, as well as in his unaffected mother. The patient had whole-exome-sequencing as one of the previous tests carried out. - Please note that ARX c.426_458dup (p.Gly143_Ala153dup) was absent from gnomAD v2.1.1 as of December 2021
Childhood onset dystonia, chorea or related movement disorder v3.11 NUP54 Achchuthan Shanmugasundram changed review comment from: PMID:36333996 reported three unrelated patients with early-onset dystonia with striatal lesions identified with biallelic variants in NUP54 gene. One patient (patient A) had homozygous variant c.1073T>G (p.Ile358Ser), while other two patients had compound heterozygous variants (patient B: c.1073T>G (p.Ile358Ser) & c.1126A>G (p.Lys376Glu); patient C: c.1410_1412del (p.Gln471del) and two missense variants c.1414G>A (p.Glu472Lys) & c.1420C>T (p.Leu474Phe)).

The age of onset was between 12 months and five years and all had progressive neurological deterioration with dystonia, ataxia, dysarthria, dysphagia, hypotonia.

This gene has been associated with relevant phenotypes in Gene2Phenotype (NUP54-related early-onset dystonia with striatal lesions with 'moderate' rating in the DD panel), but not in OMIM.
Sources: Literature; to: PMID:36333996 reported three unrelated patients with early-onset dystonia with striatal lesions identified with biallelic variants in NUP54 gene. One patient (patient A) had homozygous variant c.1073T>G (p.Ile358Ser), while other two patients had compound heterozygous variants (patient B: c.1073T>G (p.Ile358Ser) & c.1126A>G (p.Lys376Glu); patient C: c.1410_1412del (p.Gln471del) and two missense variants c.1414G>A (p.Glu472Lys) & c.1420C>T (p.Leu474Phe)).

The age of onset was between 12 months and five years and all had progressive neurological deterioration with dystonia, ataxia, dysarthria, dysphagia, hypotonia.

Western blots showed reduced expression of NUP54 and its interaction partners NUP62/NUP58 in patient fibroblasts.

This gene has been associated with relevant phenotypes in Gene2Phenotype (NUP54-related early-onset dystonia with striatal lesions with 'moderate' rating in the DD panel), but not in OMIM.
Sources: Literature
Childhood onset dystonia, chorea or related movement disorder v1.235 SNORD118 Sarah Leigh edited their review of gene: SNORD118: Added comment: Associated with relevant phenotype in OMIM and as both RD and IF Gen2Phen gene. Numervous variants have been reported in cases with Leukoencephalopathy, brain calcifications, and cysts (OMIM:614561), which include features of motor involvement (PMID: 33029936).; Changed rating: GREEN
Childhood onset dystonia, chorea or related movement disorder v1.234 SNORD118 Sarah Leigh Phenotypes for gene: SNORD118 were changed from Leukoencephalopathy, brain calcifications, and cysts MIM#614561 to Leukoencephalopathy, brain calcifications, and cyst, OMIM:614561
Childhood onset dystonia, chorea or related movement disorder v1.154 IMPDH2 Arina Puzriakova edited their review of gene: IMPDH2: Added comment: Kuukasjärvi et al., 2021 (PMID: 34305140) report on an additional large Finnish family (6 affected members) with a heterozygous truncating variant co-segregating with a dominantly inherited dystonia-tremor phenotype. Patient fibroblasts showed reduced IMPDH2 expression. IMPDH2 is the rate-limiting enzyme in the biosynthesis of guanine nucleotides, a dopamine synthetic pathway previously linked to childhood or adolescence-onset dystonia disorders.; Changed publications to: 33098801, 34305140
Childhood onset dystonia, chorea or related movement disorder v1.152 GNB1 Sarah Leigh Added comment: Comment on mode of pathogenicity: Gen2Phen entry for GNB1 (https://www.ebi.ac.uk/gene2phenotype/gfd?dbID=2121) lists the mutation consequence summary as Activating
Childhood onset dystonia, chorea or related movement disorder v1.73 RNU7-1 Arina Puzriakova gene: RNU7-1 was added
gene: RNU7-1 was added to Childhood onset dystonia or chorea or related movement disorder. Sources: Literature
for-review tags were added to gene: RNU7-1.
Mode of inheritance for gene: RNU7-1 was set to BIALLELIC, autosomal or pseudoautosomal
Publications for gene: RNU7-1 were set to 33230297
Phenotypes for gene: RNU7-1 were set to Aicardi–Goutières syndrome-like; Type I interferonopathy
Review for gene: RNU7-1 was set to GREEN
Added comment: Not associated with any phenotype in OMIM or Gene2Phenotype.

- PMID: 33230297 (2020) - 16 individuals from 11 families with biallelic variants in the RNU7-1 gene. Clinical features were typical of Aicardi–Goutières syndrome, including spasticity, dystonia, epilepsy, peripheral neuropathy, brain calcification, mild skin involvement and delayed psychomotor development. Upregulated interferon signalling was detected in patient blood and fibroblasts. 4/12 variants were observed in 2 or more families - several from different ethnic backgrounds. 8 variants are recorded in gnomAD but at a frequency of ≤0.005, and no biallelic variants were identified in control populations. Some functional data showing a disturbance of histone RNA processing in patient-derived compared to control fibroblasts.
Sources: Literature
Childhood onset dystonia, chorea or related movement disorder v1.51 SNORD118 Zornitza Stark gene: SNORD118 was added
gene: SNORD118 was added to Childhood onset dystonia or chorea or related movement disorder. Sources: Expert list
Mode of inheritance for gene: SNORD118 was set to BIALLELIC, autosomal or pseudoautosomal
Publications for gene: SNORD118 were set to 27571260
Phenotypes for gene: SNORD118 were set to Leukoencephalopathy, brain calcifications, and cysts MIM#614561
Review for gene: SNORD118 was set to GREEN
Added comment: At least 6 cases/families reported with dystonia as a feature of the condition.
Sources: Expert list
Childhood onset dystonia, chorea or related movement disorder v0.0 STS Ellen McDonagh gene: STS was added
gene: STS was added to Childhood onset dystonia or chorea or related movement disorder. Sources: London North GLH,Expert Review Red
Mode of inheritance for gene: STS was set to