X-71141247-ACAGCAGCAG-ACAGCAG

Variant names:

Variant summary

Our verdict is Likely benign. The variant received -6 ACMG points: 0P and 6B. BP3BP6BS2

The NM_005120.3(MED12):c.6306_6308delGCA(p.Gln2103del) variant causes a disruptive inframe deletion change. The variant allele was found at a frequency of 0.000117 in 1,147,185 control chromosomes in the GnomAD database, with no homozygous occurrence. There are 4 hemizygotes in GnomAD. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Synonymous variant affecting the same amino acid position (i.e. Q2102Q) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.000018 ( 0 hom., 0 hem., cov: 23)

Exomes 𝑓: 0.00013 ( 0 hom. 4 hem. )

Consequence

MED12
NM_005120.3 disruptive_inframe_deletion

Scores

Not classified

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:2B:2

Conservation

PhyloP100: 3.82

Publications

3 publications found

Variant links:

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]

MED12 Gene-Disease associations (from GenCC):

FG syndrome 1
Inheritance: XL Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), G2P, Orphanet
MED12-related intellectual disability syndrome
Inheritance: XL Classification: DEFINITIVE Submitted by: ClinGen
X-linked intellectual disability with marfanoid habitus
Inheritance: XL Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), G2P, Orphanet
blepharophimosis - intellectual disability syndrome, MKB type
Inheritance: XL Classification: STRONG, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), Orphanet
cholestasis-pigmentary retinopathy-cleft palate syndrome
Inheritance: XL Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae)

MED12 links:

ENSG00000228427 (HGNC:):

ENSG00000228427 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -6 ACMG points.

BP3

Nonframeshift variant in repetitive region in NM_005120.3

BP6

Variant X-71141247-ACAG-A is Benign according to our data. Variant chrX-71141247-ACAG-A is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 573087.

BS2

High Hemizygotes in GnomAdExome4 at 4 XL gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MED12	NM_005120.3 link	c.6306_6308delGCA	p.Gln2103del	disruptive_inframe_deletion	Exon 43 of 45	ENST00000374080.8	NP_005111.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
MED12	ENST00000374080.8 link	c.6306_6308delGCA	p.Gln2103del	disruptive_inframe_deletion	Exon 43 of 45	1	NM_005120.3	ENSP00000363193.3

Frequencies

GnomAD3 genomes

AF:

0.0000182

AC:

AN:

110062

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000661

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.0000724

AC:

AN:

110447

AF XY:

0.00

show subpopulations

Gnomad AFR exome

AF:

0.000162

Gnomad AMR exome

AF:

0.000105

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.000125

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000479

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.000127

AC:

132

AN:

1037076

Hom.:

AF XY:

0.0000120

AC XY:

AN XY:

334090

show subpopulations

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR)

AF:

0.000122

AC:

AN:

24505

American (AMR)

AF:

0.0000363

AC:

AN:

27571

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

18319

East Asian (EAS)

AF:

0.0000755

AC:

AN:

26476

South Asian (SAS)

AF:

0.000102

AC:

AN:

49091

European-Finnish (FIN)

AF:

0.00

AC:

AN:

36816

Middle Eastern (MID)

AF:

0.000254

AC:

AN:

3944

European-Non Finnish (NFE)

AF:

0.000141

AC:

114

AN:

806794

Other (OTH)

AF:

0.000138

AC:

AN:

43560

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0), which strongly suggests a high chance of mosaicism in these individuals.

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.257

Heterozygous variant carriers

109

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.0000182

AC:

AN:

110109

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

32739

show subpopulations

African (AFR)

AF:

0.0000660

AC:

AN:

30302

American (AMR)

AF:

0.00

AC:

AN:

10353

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

2626

East Asian (EAS)

AF:

0.00

AC:

AN:

3502

South Asian (SAS)

AF:

0.00

AC:

AN:

2605

European-Finnish (FIN)

AF:

0.00

AC:

AN:

5911

Middle Eastern (MID)

AF:

0.00

AC:

AN:

209

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

52458

Other (OTH)

AF:

0.00

AC:

AN:

1476

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.500

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.00

Hom.:

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:2Benign:2

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

FG syndrome

Uncertain:1

Nov 27, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This variant, c.6306_6308del, results in the deletion of 1 amino acid(s) of the MED12 protein (p.Gln2115del), but otherwise preserves the integrity of the reading frame. The frequency data for this variant in the population databases is considered unreliable, as metrics indicate poor data quality at this position in the gnomAD database. This variant has not been reported in the literature in individuals affected with MED12-related conditions. Experimental studies and prediction algorithms are not available or were not evaluated, and the functional significance of this variant is currently unknown. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance.

not provided

Uncertain:1

Breakthrough Genomics, Breakthrough Genomics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:not provided

Familial thoracic aortic aneurysm and aortic dissection

Benign:1

Oct 20, 2021

Ambry Genetics

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This alteration is classified as likely benign based on a combination of the following: seen in unaffected individuals, population frequency, intact protein function, lack of segregation with disease, co-occurrence, RNA analysis, in silico models, amino acid conservation, lack of disease association in case-control studies, and/or the mechanism of disease or impacted region is inconsistent with a known cause of pathogenicity.

MED12-related disorder

Benign:1

Apr 03, 2020

PreventionGenetics, part of Exact Sciences

Significance:Likely benign

Review Status:no assertion criteria provided

Collection Method:clinical testing

This variant is classified as likely benign based on ACMG/AMP sequence variant interpretation guidelines (Richards et al. 2015 PMID: 25741868, with internal and published modifications).

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

PhyloP100

3.8

Mutation Taster

=83/17

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.010

Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over