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Fetal anomalies v6.112 DISP1 Ida Ertmanska changed review comment from: There are at least 10 individuals with holoprosencephaly with monoallelic variants in DISP1, and at least 10 with biallelic / compound heterozygous variants in DISP1. Among fetal cases, there are only 2 biallelic cases with DISP1 variants alone. Other individuals harboured biallelic variants in DISP1, as well as potentially pathogenic variants in other genes. Digenic inheritance appears to be common for this condition.

PMID: 38529886 Lavillaureix et al., 2024
25 individuals with midline craniofacial defects, harbouring 23 DISP1 variants identified in heterozygous, compound heterozygous or homozygous states. Sequencing method: WES. The patients presented with holoprosencephaly of variable severity: microform (14/25), lobar (2/25), semi-alobar (2/25), and alobar (7/25). 9/25 individuals were fetuses with antenatal signs of failure of the prosencephalon to divide. As 5/9 patients with severe (alobar or semi-lobar) HPE had DISP1 variants as well as variants in other known HPE-linked genes from the SHH pathway (eg, SIX3, SHH, and PTCH1), the authors suggest oligogenic inheritance. Milder presentations (microform and lobar generally seem to arise either from monoallelic truncating variants, or biallelic missense variants in DISP1.

This gene is associated with AR/AD Holoprosencephaly 10, 621143 in OMIM (accessed 17th Oct 2025).; to: PMID: 38529886 Lavillaureix et al., 2024
25 individuals with midline craniofacial defects, harbouring 23 DISP1 variants identified in heterozygous, compound heterozygous or homozygous states. Sequencing method: WES. The patients presented with holoprosencephaly of variable severity: microform (14/25), lobar (2/25), semi-alobar (2/25), and alobar (7/25). 9/25 individuals were fetuses with antenatal signs of failure of the prosencephalon to divide. As 5/9 patients with severe (alobar or semi-lobar) HPE had DISP1 variants as well as variants in other known HPE-linked genes from the SHH pathway (eg, SIX3, SHH, and PTCH1), the authors suggest oligogenic inheritance. Milder presentations (microform and lobar generally seem to arise either from monoallelic truncating variants, or biallelic missense variants in DISP1.

This gene is associated with AR/AD Holoprosencephaly 10, 621143 in OMIM (accessed 17th Oct 2025).
Fetal anomalies v6.112 DISP1 Ida Ertmanska changed review comment from: MOI should be set to BOTH monoallelic and biallelic, autosomal or pseudoautosomal. There are at least 10 individuals with holoprosencephaly with monoallelic variants in DISP1, and at least 10 with biallelic / compound heterozygous variants in DISP1.

PMID: 38529886 Lavillaureix et al., 2024
25 individuals with midline craniofacial defects, harbouring 23 DISP1 variants identified in heterozygous, compound heterozygous or homozygous states. Sequencing method: WES. The patients presented with holoprosencephaly of variable severity: microform (14/25), lobar (2/25), semi-alobar (2/25), and alobar (7/25). 9/25 individuals were fetuses with antenatal signs of failure of the prosencephalon to divide. As 5/9 patients with severe (alobar or semi-lobar) HPE had DISP1 variants as well as variants in other known HPE-linked genes from the SHH pathway (eg, SIX3, SHH, and PTCH1), the authors suggest oligogenic inheritance. Milder presentations (microform and lobar generally seem to arise either from monoallelic truncating variants, or biallelic missense variants in DISP1.

This gene is associated with AR/AD Holoprosencephaly 10, 621143 in OMIM (accessed 17th Oct 2025).; to: There are at least 10 individuals with holoprosencephaly with monoallelic variants in DISP1, and at least 10 with biallelic / compound heterozygous variants in DISP1. Among fetal cases, there are only 2 biallelic cases with DISP1 variants alone. Other individuals harboured biallelic variants in DISP1, as well as potentially pathogenic variants in other genes. Digenic inheritance appears to be common for this condition.

PMID: 38529886 Lavillaureix et al., 2024
25 individuals with midline craniofacial defects, harbouring 23 DISP1 variants identified in heterozygous, compound heterozygous or homozygous states. Sequencing method: WES. The patients presented with holoprosencephaly of variable severity: microform (14/25), lobar (2/25), semi-alobar (2/25), and alobar (7/25). 9/25 individuals were fetuses with antenatal signs of failure of the prosencephalon to divide. As 5/9 patients with severe (alobar or semi-lobar) HPE had DISP1 variants as well as variants in other known HPE-linked genes from the SHH pathway (eg, SIX3, SHH, and PTCH1), the authors suggest oligogenic inheritance. Milder presentations (microform and lobar generally seem to arise either from monoallelic truncating variants, or biallelic missense variants in DISP1.

This gene is associated with AR/AD Holoprosencephaly 10, 621143 in OMIM (accessed 17th Oct 2025).
Fetal anomalies v6.101 DISP1 Ida Ertmanska changed review comment from: MOI should be set to BOTH monoallelic and biallelic, autosomal or pseudoautosomal. There are at least 10 individuals with holoprosencephaly with monoallelic variants in DISP1, and at least 10 with biallelic / compound heterozygous variants in DISP1.

PMID: 38529886 Lavillaureix et al., 2024
25 individuals with midline craniofacial defects, harbouring 23 DISP1 variants identified in heterozygous, compound heterozygous or homozygous states. Sequencing method: WES. The patients presented with holoprosencephaly of variable severity: microform (14/25), lobar (2/25), semi-alobar (2/25), and alobar (7/25). As 5/9 patients with severe (alobar or semi-lobar) HPE had DISP1 variants as well as variants in other known HPE-linked genes from the SHH pathway (eg, SIX3, SHH, and PTCH1), the authors suggest oligogenic inheritance. Milder presentations (microform and lobar generally seem to arise either from monoallelic truncating variants, or biallelic missense variants in DISP1.

This gene is associated with AR/AD Holoprosencephaly 10, 621143 in OMIM (accessed 17th Oct 2025).; to: MOI should be set to BOTH monoallelic and biallelic, autosomal or pseudoautosomal. There are at least 10 individuals with holoprosencephaly with monoallelic variants in DISP1, and at least 10 with biallelic / compound heterozygous variants in DISP1.

PMID: 38529886 Lavillaureix et al., 2024
25 individuals with midline craniofacial defects, harbouring 23 DISP1 variants identified in heterozygous, compound heterozygous or homozygous states. Sequencing method: WES. The patients presented with holoprosencephaly of variable severity: microform (14/25), lobar (2/25), semi-alobar (2/25), and alobar (7/25). 9/25 individuals were fetuses with antenatal signs of failure of the prosencephalon to divide. As 5/9 patients with severe (alobar or semi-lobar) HPE had DISP1 variants as well as variants in other known HPE-linked genes from the SHH pathway (eg, SIX3, SHH, and PTCH1), the authors suggest oligogenic inheritance. Milder presentations (microform and lobar generally seem to arise either from monoallelic truncating variants, or biallelic missense variants in DISP1.

This gene is associated with AR/AD Holoprosencephaly 10, 621143 in OMIM (accessed 17th Oct 2025).
Fetal anomalies v3.107 PTCH1 Arina Puzriakova Phenotypes for gene: PTCH1 were changed from HOLOPROSENCEPHALY-7; BASAL CELL NEVUS SYNDROME to Holoprosencephaly 7, OMIM:610828
Fetal anomalies v0.153 PTCH1 Rebecca Foulger edited their review of gene: PTCH1: Added comment: This gene and phenotype were reviewed during meetings at Great Ormond Street hospital in March 2019. Clinical review and curation was performed by Lyn Chitty, Anna de Burca, Rhiannon Mellis, Richard Scott, Ellen McDonagh and Rebecca Foulger. Outcome of review: Confirmed that phenotype is fetally-relevant: keep on the Fetal anomalies panel as a Green gene.; Changed rating: GREEN
Fetal anomalies v0.9 PTCH1 Rebecca Foulger commented on gene: PTCH1: DDG2P rating in original PAGE list: Confirmed for HOLOPROSENCEPHALY-7 and Confirmed for BASAL CELL NEVUS SYNDROME.
Fetal anomalies v0.3 PTCH1 Rebecca Foulger reviewed gene: PTCH1: Rating: AMBER; Mode of pathogenicity: ; Publications: ; Phenotypes: ; Mode of inheritance:
Fetal anomalies v0.1 PTCH1 Rebecca Foulger Added phenotypes BASAL CELL NEVUS SYNDROME for gene: PTCH1
Fetal anomalies v0.1 PTCH1 Rebecca Foulger gene: PTCH1 was added
gene: PTCH1 was added to Fetal anomalies. Sources: Expert Review Green,PAGE DD-Gene2Phenotype
Mode of inheritance for gene: PTCH1 was set to MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown
Phenotypes for gene: PTCH1 were set to HOLOPROSENCEPHALY-7