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Fetal anomalies v6.29 PROC Arina Puzriakova reviewed gene: PROC: Rating: AMBER; Mode of pathogenicity: ; Publications: ; Phenotypes: ; Mode of inheritance:
Fetal anomalies v6.28 PROC Elizabeth Wall commented on gene: PROC: This gene and phenotype were reviewed during meetings in June & July 2025. The meetings included representatives of the North Thames and Central & South R21 testing GLHs and from the R21 Clinical Oversight Group. Clinical review and curation was performed by Natalie Chandler & Elizabeth Scotchman (North Thames GLH), Natalie Bibb, Stephanie Allen & Sarah Graham (Central & South GLH) and Alice Gardham, Esther Kinning, Vicki Harrison, Anna DeBurca, Natalie Canham, Elizabeth Wall, Sunayna Best, Soo-Mi Park & Sahar Mansour (R21 Clinical Oversight Group).
Fetal anomalies v6.24 PROC Elizabeth Wall reviewed gene: PROC: Rating: AMBER; Mode of pathogenicity: ; Publications: 39763161; Phenotypes: Thrombophilia 3 due to protein C deficiency, autosomal recessive; Mode of inheritance: BIALLELIC, autosomal or pseudoautosomal
Fetal anomalies v6.21 PROC Arina Puzriakova gene: PROC was added
gene: PROC was added to Fetal anomalies. Sources: Expert Review Amber
Mode of inheritance for gene: PROC was set to BIALLELIC, autosomal or pseudoautosomal
Publications for gene: PROC were set to 39763161
Phenotypes for gene: PROC were set to Thrombophilia 3 due to protein C deficiency, autosomal recessive
Fetal anomalies v6.14 PDE12 Achchuthan Shanmugasundram changed review comment from: PMID:39567835 (2025) reported five cases (three live-borns and two foetuses) from three unrelated families presenting with severe early-onset mitochondrial disease. They showed wide-ranging clinical presentations in utero and within the neonatal period, with muscle and brain involvement leading to marked cytochrome c oxidase (COX) deficiency in muscle and severe lactic acidosis.

In family 1, one of the two patients died at 3 months of age, while patient from family 2 died at day 2. Increased nuchal translucency, severe intra-uterine growth retardation, hydrops and cystic hygroma was noted in one of the two foetuses by prenatal ultrasound and the pregnancy ended spontaneously at 22 gestational weeks. Nuchal translucency and absence of foetal movements were observed in the other foetus, which was terminated at 19 weeks.

All three families harboured a different homozygous variant in PDE12 gene (p.Tyr155Cys, p.Gly372Glu & p.Arg41Pro) as identified by whole-exome sequencing. Based on the gnomAD database, all three missense variants were reported to be rare in general population.

Functional evidence from patient fibroblast studies showed reduced PDE12 protein and accumulation of abnormally polyadenylated mitochondrial tRNAs/rRNAs, causing disrupted mitochondrial RNA processing. In addition, in silico modeling of the variants also suggested loss of function.

This gene has not yet been associated with relevant phenotypes either in OMIM or in Gene2Phenotype.
Sources: Literature; to: PMID:39567835 (2025) reported five cases (three live-borns and two foetuses) from three unrelated families presenting with severe early-onset mitochondrial disease. They showed wide-ranging clinical presentations in utero and within the neonatal period, with muscle and brain involvement leading to marked cytochrome c oxidase (COX) deficiency in muscle and severe lactic acidosis.

Of these, the patient from family 2 (died on day 2 after birth), and the two foetuses from family 3 had foetal anomalies detected via prenatal ultrasound. The patient from family 2 had brain anomalies. Increased nuchal translucency, severe intra-uterine growth retardation, hydrops and cystic hygroma was noted in one of the two foetuses from family 3 and the pregnancy ended spontaneously at 22 gestational weeks. Nuchal translucency and absence of foetal movements were observed in the other foetus, which was terminated at 19 weeks.

All three families harboured a different homozygous variant in PDE12 gene (p.Tyr155Cys, p.Gly372Glu & p.Arg41Pro) as identified by whole-exome sequencing. Based on the gnomAD database, all three missense variants were reported to be rare in general population.

Functional evidence from patient fibroblast studies showed reduced PDE12 protein and accumulation of abnormally polyadenylated mitochondrial tRNAs/rRNAs, causing disrupted mitochondrial RNA processing. In addition, in silico modeling of the variants also suggested loss of function.

This gene has not yet been associated with relevant phenotypes either in OMIM or in Gene2Phenotype.
Sources: Literature
Fetal anomalies v6.14 PDE12 Achchuthan Shanmugasundram gene: PDE12 was added
gene: PDE12 was added to Fetal anomalies. Sources: Literature
Q3_25_promote_green tags were added to gene: PDE12.
Mode of inheritance for gene: PDE12 was set to BIALLELIC, autosomal or pseudoautosomal
Publications for gene: PDE12 were set to 39567835
Phenotypes for gene: PDE12 were set to mitochondrial disease, MONDO:0044970
Review for gene: PDE12 was set to GREEN
Added comment: PMID:39567835 (2025) reported five cases (three live-borns and two foetuses) from three unrelated families presenting with severe early-onset mitochondrial disease. They showed wide-ranging clinical presentations in utero and within the neonatal period, with muscle and brain involvement leading to marked cytochrome c oxidase (COX) deficiency in muscle and severe lactic acidosis.

In family 1, one of the two patients died at 3 months of age, while patient from family 2 died at day 2. Increased nuchal translucency, severe intra-uterine growth retardation, hydrops and cystic hygroma was noted in one of the two foetuses by prenatal ultrasound and the pregnancy ended spontaneously at 22 gestational weeks. Nuchal translucency and absence of foetal movements were observed in the other foetus, which was terminated at 19 weeks.

All three families harboured a different homozygous variant in PDE12 gene (p.Tyr155Cys, p.Gly372Glu & p.Arg41Pro) as identified by whole-exome sequencing. Based on the gnomAD database, all three missense variants were reported to be rare in general population.

Functional evidence from patient fibroblast studies showed reduced PDE12 protein and accumulation of abnormally polyadenylated mitochondrial tRNAs/rRNAs, causing disrupted mitochondrial RNA processing. In addition, in silico modeling of the variants also suggested loss of function.

This gene has not yet been associated with relevant phenotypes either in OMIM or in Gene2Phenotype.
Sources: Literature
Fetal anomalies v5.86 DET1 Sarah Leigh Added comment: Comment on publications: PMID: 39937864 was identified by the Genomics England Applied Machine Learning (ML) team in a Biocuration-ML project for identifying new gene-disease associations using Natural Language Processing (NLP) and Generative AI techniques.
Fetal anomalies v5.9 ITGAV Achchuthan Shanmugasundram Added comment: Comment on publications: PMID:39526957 paper was identified by the Genomics England Applied Machine Learning (ML) team in a Biocuration-ML project for identifying new gene-disease associations using Natural Language Processing (NLP) and Generative AI techniques.
Fetal anomalies v1.727 SCUBE3 Sarah Leigh changed review comment from: Associated with relevant phenotype in OMIM and as probable Gen2Phen gene. At least 5 variants reported in 5 unrelated cases, together with supportive functional and mouse model studies (PMID 33308444).; to: Associated with relevant phenotype in OMIM and as probable Gen2Phen gene. PMID 33308444 reports eight SCUBE variants in nine unrelated families, including eighteen affected members. In vtro studies demonstrated a variable impact of disease-causing variants on transcript processing, protein secretion and function, resulting in dysregulation on bone morphogenetic protein (BMP) signaling and a Scube3−/− mouse showed shared phenotypic features with OMIM:619184. Prenatal growth retardation was evident in 8/11 relevant cases.
Fetal anomalies v1.185 TNNT3 Rhiannon Mellis gene: TNNT3 was added
gene: TNNT3 was added to Fetal anomalies. Sources: Literature
Mode of inheritance for gene: TNNT3 was set to MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown
Publications for gene: TNNT3 were set to 32779773
Phenotypes for gene: TNNT3 were set to Arthrogryposis, distal, type 2B2
Mode of pathogenicity for gene: TNNT3 was set to Loss-of-function variants (as defined in pop up message) DO NOT cause this phenotype - please provide details in the comments
Review for gene: TNNT3 was set to GREEN
Added comment: This gene and phenotype were reviewed during meetings at Great Ormond Street hospital in October 2020. This gene has a Green evidence rating on at least one other related PanelApp panel. Clinical review and curation was performed by Lyn Chitty, Rhiannon Mellis, and Richard Scott. Outcome of review: Confirmed that phenotype is fetally-relevant: add to the Fetal anomalies panel as a Green gene.

Additional comment: Clearly documented phenotype of distal arthrogryposis. Also, recent paper in Prenatal Diagnosis reporting a het pathogenic variant in TNNT3 in a fetus with FADS; that variant has previously only been described in a family with much milder distal arthrogryposis phenotype. PMID: 32779773

(copied from OMIM): In in vitro studies, Robinson et al. (2007) demonstrated that the TNNI2 R174Q (191043.0001) and R156X (191043.0002) mutations and the TNNT3 mutation R63H (600692.0001) resulted in a gain of function with increased ATPase activity in actin-activated myosin ATPase assays, reflecting increased calcium sensitivity and consistent with increased contractility. In patients, Robinson et al. (2007) concluded that the mutation would cause increased tension in developing muscles, thus resulting in contractures and limb deformities via an active process rather than a passive process. These findings implicated disturbed muscle function as the pathogenic mechanism underlying DA2B.
Sources: Literature
Fetal anomalies v0.9 TRMT10C Rebecca Foulger commented on gene: TRMT10C: DDG2P rating in original PAGE list: Probable for Mitochondrial RNA Processing and Multiple Respiratory Chain Deficiencies
Fetal anomalies v0.1 TRMT10C Rebecca Foulger gene: TRMT10C was added
gene: TRMT10C was added to Fetal anomalies. Sources: PAGE DD-Gene2Phenotype,Expert Review Amber
Mode of inheritance for gene: TRMT10C was set to BIALLELIC, autosomal or pseudoautosomal
Phenotypes for gene: TRMT10C were set to Mitochondrial RNA Processing and Multiple Respiratory Chain Deficiencies