rs1556337063
Positions:
Variant summary
Our verdict is Pathogenic. Variant got 10 ACMG points: 11P and 1B. PM2PP2PP5_Very_StrongBP4
The NM_005120.3(MED12):c.3884G>A(p.Arg1295His) variant causes a missense change. The variant allele was found at a frequency of 0.000000913 in 1,095,459 control chromosomes in the GnomAD database, with no homozygous occurrence. There are no hemizygote samples in GnomAD. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★★).
Frequency
Genomes: not found (cov: 24)
Exomes 𝑓: 9.1e-7 ( 0 hom. 0 hem. )
Consequence
MED12
NM_005120.3 missense
NM_005120.3 missense
Scores
2
8
7
Clinical Significance
Conservation
PhyloP100: 5.49
Genes affected
MED12 (HGNC:11957): (mediator complex subunit 12) The initiation of transcription is controlled in part by a large protein assembly known as the preinitiation complex. A component of this preinitiation complex is a 1.2 MDa protein aggregate called Mediator. This Mediator component binds with a CDK8 subcomplex which contains the protein encoded by this gene, mediator complex subunit 12 (MED12), along with MED13, CDK8 kinase, and cyclin C. The CDK8 subcomplex modulates Mediator-polymerase II interactions and thereby regulates transcription initiation and reinitation rates. The MED12 protein is essential for activating CDK8 kinase. Defects in this gene cause X-linked Opitz-Kaveggia syndrome, also known as FG syndrome, and Lujan-Fryns syndrome. [provided by RefSeq, Aug 2009]
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ACMG classification
Classification made for transcript
Verdict is Pathogenic. Variant got 10 ACMG points.
PM2
Very rare variant in population databases, with high coverage;
PP2
Missense variant in gene, where missense usually causes diseases (based on misZ statistic), MED12. . Gene score misZ 6.5797 (greater than the threshold 3.09). GenCC has associacion of gene with MED12-related intellectual disability syndrome, X-linked intellectual disability with marfanoid habitus, blepharophimosis - intellectual disability syndrome, MKB type, FG syndrome 1, cholestasis-pigmentary retinopathy-cleft palate syndrome.
PP5
Variant X-71130051-G-A is Pathogenic according to our data. Variant chrX-71130051-G-A is described in ClinVar as [Likely_pathogenic]. Clinvar id is 521365.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chrX-71130051-G-A is described in Lovd as [Likely_pathogenic].
BP4
Computational evidence support a benign effect (MetaRNN=0.3840931). . Strength limited to SUPPORTING due to the PP5.
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | Protein | UniProt |
---|---|---|---|---|---|---|---|---|
MED12 | NM_005120.3 | c.3884G>A | p.Arg1295His | missense_variant | 28/45 | ENST00000374080.8 | NP_005111.2 |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Protein | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|---|
MED12 | ENST00000374080.8 | c.3884G>A | p.Arg1295His | missense_variant | 28/45 | 1 | NM_005120.3 | ENSP00000363193.3 |
Frequencies
GnomAD3 genomes Cov.: 24
GnomAD3 genomes
Cov.:
24
GnomAD4 exome AF: 9.13e-7 AC: 1AN: 1095459Hom.: 0 Cov.: 32 AF XY: 0.00 AC XY: 0AN XY: 361059
GnomAD4 exome
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1
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1095459
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32
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0
AN XY:
361059
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GnomAD4 genome Cov.: 24
GnomAD4 genome
Cov.:
24
ClinVar
Significance: Pathogenic/Likely pathogenic
Submissions summary: Pathogenic:3Other:1
Revision: criteria provided, multiple submitters, no conflicts
LINK: link
Submissions by phenotype
Familial thoracic aortic aneurysm and aortic dissection Pathogenic:1
Pathogenic, criteria provided, single submitter | clinical testing | Ambry Genetics | Nov 01, 2024 | The c.3884G>A (p.R1295H) alteration is located in exon 28 (coding exon 28) of the MED12 gene. This alteration results from a G to A substitution at nucleotide position 3884, causing the arginine (R) at amino acid position 1295 to be replaced by a histidine (H). This variant was not reported in population-based cohorts in the Genome Aggregation Database (gnomAD). This variant has been determined to be the result of a de novo mutation, has been identified in individuals with features consistent with MED12-related disorder, and segregated with disease in at least one family (Donnio, 2017; Srivastava, 2019; Maia, 2023; Callier, 2013; Ambry internal data). This amino acid position is highly conserved in available vertebrate species. This missense alteration is located in a region that has a low rate of benign missense variation (Lek, 2016; Firth, 2009). This alteration is predicted to be deleterious by in silico analysis. Based on the available evidence, this alteration is classified as pathogenic. - |
not provided Pathogenic:1
Likely pathogenic, criteria provided, single submitter | clinical testing | GeneDx | May 03, 2021 | Segregated in an affected hemizygous brother in one family, and a heterozygous mother with moderate learning difficulties, skeletal and dysmorphic features, mitral valve prolapse, and skewed X-inactivation in another family (Callier et al., 2013; Donnio et al., 2017; Srivastava et al., 2019); Not observed in large population cohorts (Lek et al., 2016); In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; In silico analysis, which includes splice predictors and evolutionary conservation, is inconclusive as to whether the variant alters gene splicing. In the absence of RNA/functional studies, the actual effect of this sequence change is unknown.; A different missense change at this residue (R1295C) has been reported in the published literature in association with MED12-related disorders (Hu et al., 2016; Charzewska et al., 2018; Rubinato et al., 2019); This variant is associated with the following publications: (PMID: 31536828, 25644381, 33925166, 23506379, 28369444, 30729724) - |
FG syndrome Pathogenic:1
Pathogenic, criteria provided, single submitter | clinical testing | Labcorp Genetics (formerly Invitae), Labcorp | Jan 22, 2024 | This sequence change replaces arginine, which is basic and polar, with histidine, which is basic and polar, at codon 1295 of the MED12 protein (p.Arg1295His). This variant is not present in population databases (gnomAD no frequency). This missense change has been observed in individuals with X-linked recessive MED12-related conditions (PMID: 23506379, 28369444, 30729724, 36271811). It has also been observed to segregate with disease in related individuals. ClinVar contains an entry for this variant (Variation ID: 521365). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is not expected to disrupt MED12 protein function with a negative predictive value of 95%. Experimental studies have shown that this missense change affects MED12 function (PMID: 28369444). For these reasons, this variant has been classified as Pathogenic. - |
FG syndrome 1 Other:1
not provided, no classification provided | literature only | GeneReviews | - | Reported in persons with nonspecific intellectual disability and features of Lujan syndrome and in male sibs with features of FG syndrome type 1 and Lujan syndrome - |
Computational scores
Source:
Name
Calibrated prediction
Score
Prediction
AlphaMissense
Uncertain
BayesDel_addAF
Pathogenic
D
BayesDel_noAF
Pathogenic
CADD
Uncertain
DANN
Uncertain
DEOGEN2
Benign
T;.;D
FATHMM_MKL
Uncertain
D
LIST_S2
Uncertain
D;D;D
M_CAP
Uncertain
D
MetaRNN
Benign
T;T;T
MetaSVM
Uncertain
T
MutationAssessor
Benign
.;N;N
PrimateAI
Uncertain
T
PROVEAN
Benign
.;N;D
REVEL
Uncertain
Sift
Benign
.;T;T
Sift4G
Benign
T;T;T
Polyphen
P;P;B
Vest4
MutPred
0.59
.;Loss of ubiquitination at K1298 (P = 0.0907);Loss of ubiquitination at K1298 (P = 0.0907);
MVP
MPC
1.8
ClinPred
D
GERP RS
RBP_binding_hub_radar
RBP_regulation_power_radar
Varity_R
gMVP
Splicing
Name
Calibrated prediction
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Prediction
SpliceAI score (max)
Details are displayed if max score is > 0.2
Find out detailed SpliceAI scores and Pangolin per-transcript scores at