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Ataxia and cerebellar anomalies - narrow panel v8.35 TSEN34 Ida Ertmanska changed review comment from: Comment on list classification: There is one patient reported in literature with a biallelic variant in TSEN34 and Pontocerebellar hypoplasia type 2. While TSEN34 shares a biochemical function with other genes known to cause Pontocerebellar hypoplasia type 2, the clinical evidence for this gene-disease association is lacking in literature. Hence, TSEN34 should be demoted to Amber for Ataxia and cerebellar anomalies - narrow panel at the next GMS update.; to: Comment on list classification: There is one patient reported in literature with a biallelic variant in TSEN34 and Pontocerebellar hypoplasia type 2. While TSEN34 shares a biochemical function with other genes known to cause Pontocerebellar hypoplasia type 2, the clinical evidence for this gene-disease association is lacking in literature. Hence, TSEN34 should be demoted to Amber for Ataxia and cerebellar anomalies - narrow panel, until more evidence emerges.
Ataxia and cerebellar anomalies - narrow panel v8.35 TSEN34 Ida Ertmanska Phenotypes for gene: TSEN34 were changed from Pontocerebellar hypoplasia type 2C, OMIM:612390 to Pontocerebellar hypoplasia type 2C, OMIM:612390; pontocerebellar hypoplasia type 2C, MONDO:0012891
Ataxia and cerebellar anomalies - narrow panel v8.34 TSEN34 Ida Ertmanska Publications for gene: TSEN34 were set to 18711368; 20952379; 27370523
Ataxia and cerebellar anomalies - narrow panel v8.33 TSEN34 Ida Ertmanska edited their review of gene: TSEN34: Changed publications to: 20952379, 27370523, 32476018, 37544645
Ataxia and cerebellar anomalies - narrow panel v8.33 TSEN34 Ida Ertmanska edited their review of gene: TSEN34: Changed phenotypes to: Pontocerebellar hypoplasia type 2C, OMIM:612390, pontocerebellar hypoplasia type 2C, MONDO:0012891
Ataxia and cerebellar anomalies - narrow panel v8.33 TSEN34 Ida Ertmanska changed review comment from: PMID: 20952379 Namavar et al., 2011
Reported one Pontocerebellar hypoplasia type 2C patient with a homozygous p.R58W variant in TSEN34 and epileptic seizures. PCH2 patient with seizures and TSEN34 variant reported in (most likely the same patient as in PMID:18711368 Budde et al., 2008). Sequenced exon-intron boundaries of TSEN54, TSEN34, TSEN2, TSEN15, RARS2 and VRK1 only.

PMID: 27370523 Balbi, Taicher & Litman, 2016
Brief mention of a 2-year-old female child diagnosed with TSEN34-related pontocerebellar hypoplasia Type 2 - no variant/clinical details.

Functional evidence:
PMID: 32476018 Hayne et al., 2020 / PMID: 37544645 Hayne et al., 2023
Human tRNA splicing endonuclease (TSEN) is comprised of four core subunits (TSEN54, TSEN2, TSEN34 and TSEN15), and it co-purifies with CLP1. Other TSEN subunits and CLP1 are all known to cause PCH. The TSEN34 R58W mutation eliminates a salt bridge between R58 and E218, affecting protein stability.

Additional info:
Variant NM_001077446.4(TSEN34):c.862_865dup (p.Leu289fs) was reported as Likely Pathogenic for Pontocerebellar hypoplasia type 2C in ClinVar by Mendelics (source: clinical testing).

This gene is putatively linked to AR Pontocerebellar hypoplasia type 2C, MIM:612390 (OMIM accessed 15th Dec 2025).; to: PMID: 20952379 Namavar et al., 2011
Reported one Pontocerebellar hypoplasia type 2C patient with a homozygous p.R58W variant in TSEN34 and epileptic seizures. PCH2 patient with seizures and TSEN34 variant reported in (most likely the same patient as in PMID:18711368 Budde et al., 2008). Sequenced exon-intron boundaries of TSEN54, TSEN34, TSEN2, TSEN15, RARS2 and VRK1 only.
Patient details from PMID:18711368: Patient hg1, male, phenotype: progressive microcephaly, chorea/dystonia, visual impairment, spontaneous breath; MRI typical.


PMID: 27370523 Balbi, Taicher & Litman, 2016
Brief mention of a 2-year-old female child diagnosed with TSEN34-related pontocerebellar hypoplasia Type 2 - no variant/clinical details.

Functional evidence:
PMID: 32476018 Hayne et al., 2020 / PMID: 37544645 Hayne et al., 2023
Human tRNA splicing endonuclease (TSEN) is comprised of four core subunits (TSEN54, TSEN2, TSEN34 and TSEN15), and it co-purifies with CLP1. Other TSEN subunits and CLP1 are all known to cause PCH. The TSEN34 R58W mutation eliminates a salt bridge between R58 and E218, affecting protein stability.

Additional info:
Variant NM_001077446.4(TSEN34):c.862_865dup (p.Leu289fs) was reported as Likely Pathogenic for Pontocerebellar hypoplasia type 2C in ClinVar by Mendelics (source: clinical testing).

This gene is putatively linked to AR Pontocerebellar hypoplasia type 2C, MIM:612390 (OMIM accessed 15th Dec 2025).
Ataxia and cerebellar anomalies - narrow panel v8.33 TSEN34 Ida Ertmanska changed review comment from: PMID: 20952379 Namavar et al., 2011
Reported one Pontocerebellar hypoplasia type 2C patient with a homozygous p.R58W variant in TSEN34 and epileptic seizures. PCH2 patient with seizures and TSEN34 variant reported in (most likely the same patient as in PMID:18711368 Budde et al., 2008). Sequenced exon-intron boundaries of TSEN54, TSEN34, TSEN2, TSEN15, RARS2 and VRK1 only.

PMID: 27370523 Balbi, Taicher & Litman, 2016
Brief report of a 2-year-old female child diagnosed with TSEN34-related pontocerebellar hypoplasia Type 2 - no variant details.

Functional evidence:
PMID: 32476018 Hayne et al., 2020 / PMID: 37544645 Hayne et al., 2023
Human tRNA splicing endonuclease (TSEN) is comprised of four core subunits (TSEN54, TSEN2, TSEN34 and TSEN15), and it co-purifies with CLP1. Other TSEN subunits and CLP1 are all known to cause PCH. The TSEN34 R58W mutation eliminates a salt bridge between R58 and E218, affecting protein stability.

Additional info:
Variant NM_001077446.4(TSEN34):c.862_865dup (p.Leu289fs) was reported as Likely Pathogenic for Pontocerebellar hypoplasia type 2C in ClinVar by Mendelics (source: clinical testing).

This gene is putatively linked to AR Pontocerebellar hypoplasia type 2C, MIM:612390 (OMIM accessed 15th Dec 2025).; to: PMID: 20952379 Namavar et al., 2011
Reported one Pontocerebellar hypoplasia type 2C patient with a homozygous p.R58W variant in TSEN34 and epileptic seizures. PCH2 patient with seizures and TSEN34 variant reported in (most likely the same patient as in PMID:18711368 Budde et al., 2008). Sequenced exon-intron boundaries of TSEN54, TSEN34, TSEN2, TSEN15, RARS2 and VRK1 only.

PMID: 27370523 Balbi, Taicher & Litman, 2016
Brief mention of a 2-year-old female child diagnosed with TSEN34-related pontocerebellar hypoplasia Type 2 - no variant/clinical details.

Functional evidence:
PMID: 32476018 Hayne et al., 2020 / PMID: 37544645 Hayne et al., 2023
Human tRNA splicing endonuclease (TSEN) is comprised of four core subunits (TSEN54, TSEN2, TSEN34 and TSEN15), and it co-purifies with CLP1. Other TSEN subunits and CLP1 are all known to cause PCH. The TSEN34 R58W mutation eliminates a salt bridge between R58 and E218, affecting protein stability.

Additional info:
Variant NM_001077446.4(TSEN34):c.862_865dup (p.Leu289fs) was reported as Likely Pathogenic for Pontocerebellar hypoplasia type 2C in ClinVar by Mendelics (source: clinical testing).

This gene is putatively linked to AR Pontocerebellar hypoplasia type 2C, MIM:612390 (OMIM accessed 15th Dec 2025).
Ataxia and cerebellar anomalies - narrow panel v8.33 TSEN34 Ida Ertmanska changed review comment from: PMID: 20952379 Namavar et al., 2011
Reported one Pontocerebellar hypoplasia type 2C patient with a homozygous p.R58W variant in TSEN34 and epileptic seizures. PCH2 patient with seizures and TSEN34 variant reported in (most likely the same patient as in PMID:18711368 Budde et al., 2008). Sequenced exon-intron boundaries of TSEN54, TSEN34, TSEN2, TSEN15, RARS2 and VRK1 only.

PMID: 27370523 Balbi, Taicher & Litman, 2016
Brief report of a 2-year-old female child diagnosed with TSEN34-related pontocerebellar hypoplasia Type 2 - no variant details.

Variant NM_001077446.4(TSEN34):c.862_865dup (p.Leu289fs) was reported as Likely Pathogenic for Pontocerebellar hypoplasia type 2C in ClinVar by Mendelics (source: clinical testing).

This gene is putatively linked to AR Pontocerebellar hypoplasia type 2C, MIM:612390 (OMIM accessed 15th Dec 2025).; to: PMID: 20952379 Namavar et al., 2011
Reported one Pontocerebellar hypoplasia type 2C patient with a homozygous p.R58W variant in TSEN34 and epileptic seizures. PCH2 patient with seizures and TSEN34 variant reported in (most likely the same patient as in PMID:18711368 Budde et al., 2008). Sequenced exon-intron boundaries of TSEN54, TSEN34, TSEN2, TSEN15, RARS2 and VRK1 only.

PMID: 27370523 Balbi, Taicher & Litman, 2016
Brief report of a 2-year-old female child diagnosed with TSEN34-related pontocerebellar hypoplasia Type 2 - no variant details.

Functional evidence:
PMID: 32476018 Hayne et al., 2020 / PMID: 37544645 Hayne et al., 2023
Human tRNA splicing endonuclease (TSEN) is comprised of four core subunits (TSEN54, TSEN2, TSEN34 and TSEN15), and it co-purifies with CLP1. Other TSEN subunits and CLP1 are all known to cause PCH. The TSEN34 R58W mutation eliminates a salt bridge between R58 and E218, affecting protein stability.

Additional info:
Variant NM_001077446.4(TSEN34):c.862_865dup (p.Leu289fs) was reported as Likely Pathogenic for Pontocerebellar hypoplasia type 2C in ClinVar by Mendelics (source: clinical testing).

This gene is putatively linked to AR Pontocerebellar hypoplasia type 2C, MIM:612390 (OMIM accessed 15th Dec 2025).
Ataxia and cerebellar anomalies - narrow panel v8.33 TSEN34 Ida Ertmanska commented on gene: TSEN34: Comment on list classification: There is one patient reported in literature with a biallelic variant in TSEN34 and Pontocerebellar hypoplasia type 2. While TSEN34 shares a biochemical function with other genes known to cause Pontocerebellar hypoplasia type 2, the clinical evidence for this gene-disease association is lacking in literature. Hence, TSEN34 should be demoted to Amber for Ataxia and cerebellar anomalies - narrow panel at the next GMS update.
Ataxia and cerebellar anomalies - narrow panel v8.33 TSEN34 Ida Ertmanska Tag Q4_25_demote_amber tag was added to gene: TSEN34.
Ataxia and cerebellar anomalies - narrow panel v8.33 TSEN34 Ida Ertmanska Phenotypes for gene: TSEN34 were changed from Pontocerebellar hypoplasia type 2C,612390; Pontocerebellar Hypoplasia type 2C; Pontocerebellar hypoplasia 2C (612390); Pontocerebellar Hypoplasia to Pontocerebellar hypoplasia type 2C, OMIM:612390
Ataxia and cerebellar anomalies - narrow panel v8.32 TSEN34 Ida Ertmanska Publications for gene: TSEN34 were set to PMID: 18711368
Ataxia and cerebellar anomalies - narrow panel v8.31 TSEN34 Ida Ertmanska edited their review of gene: TSEN34: Changed rating: AMBER
Ataxia and cerebellar anomalies - narrow panel v8.31 TSEN34 Ida Ertmanska reviewed gene: TSEN34: Rating: RED; Mode of pathogenicity: None; Publications: 20952379, 27370523; Phenotypes: Pontocerebellar hypoplasia type 2C, OMIM:612390; Mode of inheritance: BIALLELIC, autosomal or pseudoautosomal
Ataxia and cerebellar anomalies - narrow panel v0.5 TSEN34 Ellen McDonagh Added phenotypes Pontocerebellar hypoplasia 2C (612390) for gene: TSEN34
Ataxia and cerebellar anomalies - narrow panel v0.5 TSEN34 Ellen McDonagh gene: TSEN34 was added
gene: TSEN34 was added to Ataxia and cerebellar anomalies - narrow panel. Sources: Expert Review Green
Mode of inheritance for gene: TSEN34 was set to BIALLELIC, autosomal or pseudoautosomal
Publications for gene: TSEN34 were set to PMID: 18711368
Phenotypes for gene: TSEN34 were set to Pontocerebellar hypoplasia type 2C,612390; Pontocerebellar Hypoplasia type 2C; Pontocerebellar Hypoplasia