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Early onset or syndromic epilepsy v3.35 MED12 Eleanor Williams Tag Q3_21_MOI was removed from gene: MED12.
Tag Q3_21_expert_review was removed from gene: MED12.
Early onset or syndromic epilepsy v3.29 MED12 Arina Puzriakova commented on gene: MED12
Early onset or syndromic epilepsy v2.434 MED12 Eleanor Williams Tag Q3_21_MOI tag was added to gene: MED12.
Tag Q3_21_expert_review tag was added to gene: MED12.
Early onset or syndromic epilepsy v2.434 MED12 Eleanor Williams changed review comment from: Review of mode of inheritance shows that although in some families only males were affected, in 5 cases females with seizures as part of the phenotype were reported who had MED12 variants therefore a mode of inheritance of X-LINKED: hemizygous mutation in males, monoallelic mutations in females appears correct.

Reports of males only affected:
PMID: 17369503 - Schwartz et al 2007 - report 2 kindreds with males (7 total) affected with Lujan-Fryns syndrome and variants in MED12. Seizures were noted in 1 individual from 1 kindred.

PMID: 23395478 - Vulto-van Silfhout et al 2013 - report 3 unrelated cases with males affected by Ohdo syndrome MKB type. In 2 families 2 males were affected, in the third 1 male. In all, missense changes in MED12 were detected. In family 2 a second segregating missense variant in the ATRX gene (linked to ATRX syndrome) but further investigation did not support a ATRX syndrome diagnosis. Intellectual disability was noted (1 mild, 1 moderate, 2 severe, 1 severity not noted) in all 5 individuals. Seizures were noted in 1.

PMID: 32715471 - Rubin et al 2020 - report 1 family with three male siblings of with intellectual disability and characteristic facial and distal extremity anomalies with a novel missense variant in MED12. The diagnosis most closely matched Ohdo syndrome. Seizures are not reported.

PMID: 17334363 - Risheg et al 2007 - report 6 families in with Opitz-Kaveggia syndrome (also known as FG syndrome) in with the same 2881C>T variant identified in MED12. Two of the families are stated to be from different ethnic groups. In all families only males were affected. Intellectual disability was present in all affected males (4 families) who survived long enough for developmental or cognitive assessment. Seizures were noted in 3 of the families (4/7 individuals). Marked skewed X inactivation was noted in female carriers in 3 families, moderate skewing in 1 family and absence of skewing in two families.

Reports with females affected:

PMID: 33244165 - Polla et al 2021 - report on assembled clinical and genetic data of 18 females with de novo variants in MED12. 11/18 have severe intellectual disability. Seizures were noted in 5.
Analysis of X-inactivation status showed extreme skewing (>95%) in 10 indivduals, skewing (85%) in 1 individual and it was random XCI in 6 (3 with protein truncating variants, 3 with missense). The androgen receptor alleles were non-informative for 1 person.

PMID: 34079076 - Riccardi et al 2021 - report an additional 4 female patients that carry de novo missense variants in MED12. All four patients had an intellectual disability, though it was severe only in one case. No seizures were noted.; to: Review of mode of inheritance shows that although in some families only males were affected, in 5 cases females with seizures as part of the phenotype were reported who had MED12 variants therefore a mode of inheritance of X-LINKED: hemizygous mutation in males, monoallelic mutations in females appears correct although consideration should be given to the carrier implications for the predominantly male-only phenotypes associated with this gene.

Reports of males only affected:
PMID: 17369503 - Schwartz et al 2007 - report 2 kindreds with males (7 total) affected with Lujan-Fryns syndrome and variants in MED12. Seizures were noted in 1 individual from 1 kindred.

PMID: 23395478 - Vulto-van Silfhout et al 2013 - report 3 unrelated cases with males affected by Ohdo syndrome MKB type. In 2 families 2 males were affected, in the third 1 male. In all, missense changes in MED12 were detected. In family 2 a second segregating missense variant in the ATRX gene (linked to ATRX syndrome) but further investigation did not support a ATRX syndrome diagnosis. Intellectual disability was noted (1 mild, 1 moderate, 2 severe, 1 severity not noted) in all 5 individuals. Seizures were noted in 1.

PMID: 32715471 - Rubin et al 2020 - report 1 family with three male siblings of with intellectual disability and characteristic facial and distal extremity anomalies with a novel missense variant in MED12. The diagnosis most closely matched Ohdo syndrome. Seizures are not reported.

PMID: 17334363 - Risheg et al 2007 - report 6 families in with Opitz-Kaveggia syndrome (also known as FG syndrome) in with the same 2881C>T variant identified in MED12. Two of the families are stated to be from different ethnic groups. In all families only males were affected. Intellectual disability was present in all affected males (4 families) who survived long enough for developmental or cognitive assessment. Seizures were noted in 3 of the families (4/7 individuals). Marked skewed X inactivation was noted in female carriers in 3 families, moderate skewing in 1 family and absence of skewing in two families.

Reports with females affected:

PMID: 33244165 - Polla et al 2021 - report on assembled clinical and genetic data of 18 females with de novo variants in MED12. 11/18 have severe intellectual disability. Seizures were noted in 5.
Analysis of X-inactivation status showed extreme skewing (>95%) in 10 indivduals, skewing (85%) in 1 individual and it was random XCI in 6 (3 with protein truncating variants, 3 with missense). The androgen receptor alleles were non-informative for 1 person.

PMID: 34079076 - Riccardi et al 2021 - report an additional 4 female patients that carry de novo missense variants in MED12. All four patients had an intellectual disability, though it was severe only in one case. No seizures were noted.
Early onset or syndromic epilepsy v2.434 MED12 Eleanor Williams Tag Skewed X-inactivation tag was added to gene: MED12.
Early onset or syndromic epilepsy v2.431 MED12 Eleanor Williams changed review comment from: Review of mode of inheritance shows that although in some families only males were affected, females were also reported in 5 cases seizures with MED12 variants therefore a mode of inheritance of X-LINKED: hemizygous mutation in males, monoallelic mutations in females appears correct.

Reports of males only affected:
PMID: 17369503 - Schwartz et al 2007 - report 2 kindreds with males (7 total) affected with Lujan-Fryns syndrome and variants in MED12. Seizures were noted in 1 individual from 1 kindred.

PMID: 23395478 - Vulto-van Silfhout et al 2013 - report 3 unrelated cases with males affected by Ohdo syndrome MKB type. In 2 families 2 males were affected, in the third 1 male. In all, missense changes in MED12 were detected. In family 2 a second segregating missense variant in the ATRX gene (linked to ATRX syndrome) but further investigation did not support a ATRX syndrome diagnosis. Intellectual disability was noted (1 mild, 1 moderate, 2 severe, 1 severity not noted) in all 5 individuals. Seizures were noted in 1.

PMID: 32715471 - Rubin et al 2020 - report 1 family with three male siblings of with intellectual disability and characteristic facial and distal extremity anomalies with a novel missense variant in MED12. The diagnosis most closely matched Ohdo syndrome. Seizures are not reported.

PMID: 17334363 - Risheg et al 2007 - report 6 families in with Opitz-Kaveggia syndrome (also known as FG syndrome) in with the same 2881C>T variant identified in MED12. Two of the families are stated to be from different ethnic groups. In all families only males were affected. Intellectual disability was present in all affected males (4 families) who survived long enough for developmental or cognitive assessment. Seizures were noted in 3 of the families (4/7 individuals). Marked skewed X inactivation was noted in female carriers in 3 families, moderate skewing in 1 family and absence of skewing in two families.

Reports with females affected:

PMID: 33244165 - Polla et al 2021 - report on assembled clinical and genetic data of 18 females with de novo variants in MED12. 11/18 have severe intellectual disability. Seizures were noted in 5.
Analysis of X-inactivation status showed extreme skewing (>95%) in 10 indivduals, skewing (85%) in 1 individual and it was random XCI in 6 (3 with protein truncating variants, 3 with missense). The androgen receptor alleles were non-informative for 1 person.

PMID: 34079076 - Riccardi et al 2021 - report an additional 4 female patients that carry de novo missense variants in MED12. All four patients had an intellectual disability, though it was severe only in one case. No seizures were noted.; to: Review of mode of inheritance shows that although in some families only males were affected, in 5 cases females with seizures as part of the phenotype were reported who had MED12 variants therefore a mode of inheritance of X-LINKED: hemizygous mutation in males, monoallelic mutations in females appears correct.

Reports of males only affected:
PMID: 17369503 - Schwartz et al 2007 - report 2 kindreds with males (7 total) affected with Lujan-Fryns syndrome and variants in MED12. Seizures were noted in 1 individual from 1 kindred.

PMID: 23395478 - Vulto-van Silfhout et al 2013 - report 3 unrelated cases with males affected by Ohdo syndrome MKB type. In 2 families 2 males were affected, in the third 1 male. In all, missense changes in MED12 were detected. In family 2 a second segregating missense variant in the ATRX gene (linked to ATRX syndrome) but further investigation did not support a ATRX syndrome diagnosis. Intellectual disability was noted (1 mild, 1 moderate, 2 severe, 1 severity not noted) in all 5 individuals. Seizures were noted in 1.

PMID: 32715471 - Rubin et al 2020 - report 1 family with three male siblings of with intellectual disability and characteristic facial and distal extremity anomalies with a novel missense variant in MED12. The diagnosis most closely matched Ohdo syndrome. Seizures are not reported.

PMID: 17334363 - Risheg et al 2007 - report 6 families in with Opitz-Kaveggia syndrome (also known as FG syndrome) in with the same 2881C>T variant identified in MED12. Two of the families are stated to be from different ethnic groups. In all families only males were affected. Intellectual disability was present in all affected males (4 families) who survived long enough for developmental or cognitive assessment. Seizures were noted in 3 of the families (4/7 individuals). Marked skewed X inactivation was noted in female carriers in 3 families, moderate skewing in 1 family and absence of skewing in two families.

Reports with females affected:

PMID: 33244165 - Polla et al 2021 - report on assembled clinical and genetic data of 18 females with de novo variants in MED12. 11/18 have severe intellectual disability. Seizures were noted in 5.
Analysis of X-inactivation status showed extreme skewing (>95%) in 10 indivduals, skewing (85%) in 1 individual and it was random XCI in 6 (3 with protein truncating variants, 3 with missense). The androgen receptor alleles were non-informative for 1 person.

PMID: 34079076 - Riccardi et al 2021 - report an additional 4 female patients that carry de novo missense variants in MED12. All four patients had an intellectual disability, though it was severe only in one case. No seizures were noted.
Early onset or syndromic epilepsy v2.431 MED12 Eleanor Williams changed review comment from: Review of mode of inheritance shows that although in some families only males were affected, females were also reported in 5 cases with MED12 variants therefore a mode of inheritance of X-LINKED: hemizygous mutation in males, monoallelic mutations in females appears correct.

Reports of males only affected:
PMID: 17369503 - Schwartz et al 2007 - report 2 kindreds with males (7 total) affected with Lujan-Fryns syndrome and variants in MED12. Seizures were noted in 1 individual from 1 kindred.

PMID: 23395478 - Vulto-van Silfhout et al 2013 - report 3 unrelated cases with males affected by Ohdo syndrome MKB type. In 2 families 2 males were affected, in the third 1 male. In all, missense changes in MED12 were detected. In family 2 a second segregating missense variant in the ATRX gene (linked to ATRX syndrome) but further investigation did not support a ATRX syndrome diagnosis. Intellectual disability was noted (1 mild, 1 moderate, 2 severe, 1 severity not noted) in all 5 individuals. Seizures were noted in 1.

PMID: 32715471 - Rubin et al 2020 - report 1 family with three male siblings of with intellectual disability and characteristic facial and distal extremity anomalies with a novel missense variant in MED12. The diagnosis most closely matched Ohdo syndrome. Seizures are not reported.

PMID: 17334363 - Risheg et al 2007 - report 6 families in with Opitz-Kaveggia syndrome (also known as FG syndrome) in with the same 2881C>T variant identified in MED12. Two of the families are stated to be from different ethnic groups. In all families only males were affected. Intellectual disability was present in all affected males (4 families) who survived long enough for developmental or cognitive assessment. Seizures were noted in 3 of the families (4/7 individuals). Marked skewed X inactivation was noted in female carriers in 3 families, moderate skewing in 1 family and absence of skewing in two families.

Reports with females affected:

PMID: 33244165 - Polla et al 2021 - report on assembled clinical and genetic data of 18 females with de novo variants in MED12. 11/18 have severe intellectual disability. Seizures were noted in 5.
Analysis of X-inactivation status showed extreme skewing (>95%) in 10 indivduals, skewing (85%) in 1 individual and it was random XCI in 6 (3 with protein truncating variants, 3 with missense). The androgen receptor alleles were non-informative for 1 person.

PMID: 34079076 - Riccardi et al 2021 - report an additional 4 female patients that carry de novo missense variants in MED12. All four patients had an intellectual disability, though it was severe only in one case. No seizures were noted.; to: Review of mode of inheritance shows that although in some families only males were affected, females were also reported in 5 cases seizures with MED12 variants therefore a mode of inheritance of X-LINKED: hemizygous mutation in males, monoallelic mutations in females appears correct.

Reports of males only affected:
PMID: 17369503 - Schwartz et al 2007 - report 2 kindreds with males (7 total) affected with Lujan-Fryns syndrome and variants in MED12. Seizures were noted in 1 individual from 1 kindred.

PMID: 23395478 - Vulto-van Silfhout et al 2013 - report 3 unrelated cases with males affected by Ohdo syndrome MKB type. In 2 families 2 males were affected, in the third 1 male. In all, missense changes in MED12 were detected. In family 2 a second segregating missense variant in the ATRX gene (linked to ATRX syndrome) but further investigation did not support a ATRX syndrome diagnosis. Intellectual disability was noted (1 mild, 1 moderate, 2 severe, 1 severity not noted) in all 5 individuals. Seizures were noted in 1.

PMID: 32715471 - Rubin et al 2020 - report 1 family with three male siblings of with intellectual disability and characteristic facial and distal extremity anomalies with a novel missense variant in MED12. The diagnosis most closely matched Ohdo syndrome. Seizures are not reported.

PMID: 17334363 - Risheg et al 2007 - report 6 families in with Opitz-Kaveggia syndrome (also known as FG syndrome) in with the same 2881C>T variant identified in MED12. Two of the families are stated to be from different ethnic groups. In all families only males were affected. Intellectual disability was present in all affected males (4 families) who survived long enough for developmental or cognitive assessment. Seizures were noted in 3 of the families (4/7 individuals). Marked skewed X inactivation was noted in female carriers in 3 families, moderate skewing in 1 family and absence of skewing in two families.

Reports with females affected:

PMID: 33244165 - Polla et al 2021 - report on assembled clinical and genetic data of 18 females with de novo variants in MED12. 11/18 have severe intellectual disability. Seizures were noted in 5.
Analysis of X-inactivation status showed extreme skewing (>95%) in 10 indivduals, skewing (85%) in 1 individual and it was random XCI in 6 (3 with protein truncating variants, 3 with missense). The androgen receptor alleles were non-informative for 1 person.

PMID: 34079076 - Riccardi et al 2021 - report an additional 4 female patients that carry de novo missense variants in MED12. All four patients had an intellectual disability, though it was severe only in one case. No seizures were noted.
Early onset or syndromic epilepsy v2.431 MED12 Eleanor Williams changed review comment from: Review of mode of inheritance shows that although in some families only males were affected, females were also reported in 5 cases with MED12 variants therefore a mode of inheritance of X-LINKED: hemizygous mutation in males, monoallelic mutations in females appears correct.

Reports of males only affected:
PMID: 17369503 - Schwartz et al 2007 - report 2 kindreds with males (7 total) affected with Lujan-Fryns syndrome and variants in MED12. Seizures were noted in 1 individual from 1 kindred.

PMID: 23395478 - Vulto-van Silfhout et al 2013 - report 3 unrelated cases with males affected by Ohdo syndrome MKB type. In 2 families 2 males were affected, in the third 1 male. In all, missense changes in MED12 were detected. In family 2 a second segregating missense variant in the ATRX gene (linked to ATRX syndrome) but further investigation did not support a ATRX syndrome diagnosis. Intellectual disability was noted (1 mild, 1 moderate, 2 severe, 1 severity not noted) in all 5 individuals. Seizures were noted in 1.

PMID: 32715471 - Rubin et al 2020 - report 1 family with three male siblings of with intellectual disability and characteristic facial and distal extremity anomalies with a novel missense variant in MED12. The diagnosis most closely matched Ohdo syndrome. Seizures are not reported.

PMID: 17334363 - Risheg et al 2007 - report 6 families in with Opitz-Kaveggia syndrome (also known as FG syndrome) in with the same 2881C>T variant identified in MED12. In all families only males were affected. Intellectual disability was present in all affected males (4 families) who survived long enough for developmental or cognitive assessment. Seizures were noted in 3 of the families (4/7 individuals). Marked skewed X inactivation was noted in female carriers in 3 families, moderate skewing in 1 family and absence of skewing in two families.

Reports with females affected:

PMID: 33244165 - Polla et al 2021 - report on assembled clinical and genetic data of 18 females with de novo variants in MED12. 11/18 have severe intellectual disability. Seizures were noted in 5.
Analysis of X-inactivation status showed extreme skewing (>95%) in 10 indivduals, skewing (85%) in 1 individual and it was random XCI in 6 (3 with protein truncating variants, 3 with missense). The androgen receptor alleles were non-informative for 1 person.

PMID: 34079076 - Riccardi et al 2021 - report an additional 4 female patients that carry de novo missense variants in MED12. All four patients had an intellectual disability, though it was severe only in one case. No seizures were noted.; to: Review of mode of inheritance shows that although in some families only males were affected, females were also reported in 5 cases with MED12 variants therefore a mode of inheritance of X-LINKED: hemizygous mutation in males, monoallelic mutations in females appears correct.

Reports of males only affected:
PMID: 17369503 - Schwartz et al 2007 - report 2 kindreds with males (7 total) affected with Lujan-Fryns syndrome and variants in MED12. Seizures were noted in 1 individual from 1 kindred.

PMID: 23395478 - Vulto-van Silfhout et al 2013 - report 3 unrelated cases with males affected by Ohdo syndrome MKB type. In 2 families 2 males were affected, in the third 1 male. In all, missense changes in MED12 were detected. In family 2 a second segregating missense variant in the ATRX gene (linked to ATRX syndrome) but further investigation did not support a ATRX syndrome diagnosis. Intellectual disability was noted (1 mild, 1 moderate, 2 severe, 1 severity not noted) in all 5 individuals. Seizures were noted in 1.

PMID: 32715471 - Rubin et al 2020 - report 1 family with three male siblings of with intellectual disability and characteristic facial and distal extremity anomalies with a novel missense variant in MED12. The diagnosis most closely matched Ohdo syndrome. Seizures are not reported.

PMID: 17334363 - Risheg et al 2007 - report 6 families in with Opitz-Kaveggia syndrome (also known as FG syndrome) in with the same 2881C>T variant identified in MED12. Two of the families are stated to be from different ethnic groups. In all families only males were affected. Intellectual disability was present in all affected males (4 families) who survived long enough for developmental or cognitive assessment. Seizures were noted in 3 of the families (4/7 individuals). Marked skewed X inactivation was noted in female carriers in 3 families, moderate skewing in 1 family and absence of skewing in two families.

Reports with females affected:

PMID: 33244165 - Polla et al 2021 - report on assembled clinical and genetic data of 18 females with de novo variants in MED12. 11/18 have severe intellectual disability. Seizures were noted in 5.
Analysis of X-inactivation status showed extreme skewing (>95%) in 10 indivduals, skewing (85%) in 1 individual and it was random XCI in 6 (3 with protein truncating variants, 3 with missense). The androgen receptor alleles were non-informative for 1 person.

PMID: 34079076 - Riccardi et al 2021 - report an additional 4 female patients that carry de novo missense variants in MED12. All four patients had an intellectual disability, though it was severe only in one case. No seizures were noted.
Early onset or syndromic epilepsy v2.431 MED12 Eleanor Williams commented on gene: MED12
Early onset or syndromic epilepsy v1.282 MED12 Rebecca Foulger Marked gene: MED12 as ready
Early onset or syndromic epilepsy v1.282 MED12 Rebecca Foulger Gene: med12 has been classified as Green List (High Evidence).
Early onset or syndromic epilepsy v1.282 MED12 Rebecca Foulger Added comment: Comment on mode of inheritance: Updated Mode of Inheritance from XLR to XLD based on Post-Webex review by Helen Lord.
Early onset or syndromic epilepsy v1.282 MED12 Rebecca Foulger Mode of inheritance for gene: MED12 was changed from X-LINKED: hemizygous mutation in males, biallelic mutations in females to X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males)
Early onset or syndromic epilepsy v1.262 MED12 Rebecca Foulger commented on gene: MED12: Mode of inheritance collated by Helen Lord (Oxford University Hospitals NHS Foundation Trust, 2019_08_30) on behalf of West Midlands, Oxford and Wessex GLH for GMS Neurology specialist test group. This gene is part of a subset where the mode of inheritance was re-reviewed following the group Webex call on 2019_08_08 for Clinical Indication R59 Early onset or syndromic epilepsy. No rating was included in the review, so I have uploaded a Green rating to match the original West Midlands, Oxford and Wessex GLH rating.
Early onset or syndromic epilepsy v1.261 MED12 Helen Lord reviewed gene: MED12: Rating: GREEN; Mode of pathogenicity: ; Publications: ; Phenotypes: ; Mode of inheritance: X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males)
Early onset or syndromic epilepsy v1.208 MED12 Rebecca Foulger Added comment: Comment on mode of inheritance: Allelic requirement listed in Gene2Phenotype is 'hemizygous' for both 'OPITZ-KAVEGGIA SYNDROME' and 'LUJAN-FRYNS SYNDROME'.
Early onset or syndromic epilepsy v1.208 MED12 Rebecca Foulger Mode of inheritance for gene: MED12 was changed from X-LINKED: hemizygous mutation in males, biallelic mutations in females to X-LINKED: hemizygous mutation in males, biallelic mutations in females
Early onset or syndromic epilepsy v1.191 MED12 Rebecca Foulger Source Wessex and West Midlands GLH was added to MED12.
Early onset or syndromic epilepsy v1.190 MED12 Rebecca Foulger Source NHS GMS was added to MED12.
Early onset or syndromic epilepsy v1.189 MED12 Rebecca Foulger reviewed gene: MED12: Rating: AMBER; Mode of pathogenicity: ; Publications: ; Phenotypes: ; Mode of inheritance:
Early onset or syndromic epilepsy v1.188 MED12 Tracy Lester reviewed gene: MED12: Rating: GREEN; Mode of pathogenicity: ; Publications: 17334363; Phenotypes: Lujan-Fryns syndrome 309520 XLR, Ohdo syndrome, X-linked 300895 XLR, Opitz-Kaveggia syndrome 305450 XLR; Mode of inheritance: X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males)
Early onset or syndromic epilepsy v0.1153 MED12 Ivone Leong Marked gene: MED12 as ready
Early onset or syndromic epilepsy v0.1153 MED12 Ivone Leong Gene: med12 has been classified as Green List (High Evidence).
Early onset or syndromic epilepsy v0.1153 MED12 Ivone Leong Classified gene: MED12 as Green List (high evidence)
Early onset or syndromic epilepsy v0.1153 MED12 Ivone Leong Added comment: Comment on list classification: Promoted from amber to green, based on the information provided previously.
Early onset or syndromic epilepsy v0.1153 MED12 Ivone Leong Gene: med12 has been classified as Green List (High Evidence).
Early onset or syndromic epilepsy v0.1102 MED12 Ivone Leong commented on gene: MED12
Early onset or syndromic epilepsy v0.1102 MED12 Ivone Leong Publications for gene: MED12 were set to
Early onset or syndromic epilepsy v0.1101 MED12 Ivone Leong Phenotypes for gene: MED12 were changed from Lujan-Fryns syndrome, 309520 to Lujan-Fryns syndrome, 309520; Opitz-Kaveggia syndrome, 305450
Early onset or syndromic epilepsy v0.1100 MED12 Ivone Leong Mode of inheritance for gene: MED12 was changed from to X-LINKED: hemizygous mutation in males, biallelic mutations in females
Early onset or syndromic epilepsy v0.1099 MED12 Ivone Leong Phenotypes for gene: MED12 were changed from to Lujan-Fryns syndrome, 309520
Early onset or syndromic epilepsy MED12 Zornitza Stark reviewed gene: MED12
Early onset or syndromic epilepsy MED12 Sarah Leigh Added gene to panel