X-71141247-ACAGCAGCAG-ACAGCAGCAGCAGCAG

Variant names:

Variant summary

Our verdict is Benign. The variant received -10 ACMG points: 0P and 10B. BP3BP6BS1BS2

The NM_005120.3(MED12):c.6303_6308dupGCAGCA(p.Gln2102_Gln2103dup) variant causes a disruptive inframe insertion change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000136 in 110,133 control chromosomes in the GnomAD database, with no homozygous occurrence. There are 5 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. Q2103Q) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.00014 ( 0 hom., 5 hem., cov: 23)

Exomes 𝑓: 0.000047 ( 0 hom. 15 hem. )

Failed GnomAD Quality Control

Consequence

MED12
NM_005120.3 disruptive_inframe_insertion

Scores

Not classified

Clinical Significance

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

Conservation

PhyloP100: 2.31

Publications

3 publications found

Variant links:

COSMIC-nc: COSV105882214

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: Benign. The variant received -10 ACMG points.

BP3

Nonframeshift variant in repetitive region in NM_005120.3

BP6

Variant X-71141247-A-ACAGCAG is Benign according to our data. Variant chrX-71141247-A-ACAGCAG is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 197488.

BS1

Variant frequency is greater than expected in population afr. GnomAd4 allele frequency = 0.000136 (15/110133) while in subpopulation AFR AF = 0.000396 (12/30307). AF 95% confidence interval is 0.000228. There are 0 homozygotes in GnomAd4. There are 5 alleles in the male GnomAd4 subpopulation. Median coverage is 23. This position passed quality control check.

BS2

High Hemizygotes in GnomAd4 at 5 XL gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MED12	NM_005120.3 link	c.6303_6308dupGCAGCA	p.Gln2102_Gln2103dup	disruptive_inframe_insertion	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.6303_6308dupGCAGCA	p.Gln2102_Gln2103dup	disruptive_inframe_insertion	Exon 43 of 45	1	NM_005120.3	ENSP00000363193.3

Frequencies

GnomAD3 genomes

AF:

0.000136

AC:

AN:

110085

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000397

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.000762

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00437

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.0000905

AC:

AN:

110447

AF XY:

0.0000516

show subpopulations

Gnomad AFR exome

AF:

0.000485

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.000976

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

Data not reliable, filtered out with message: AS_VQSR

AF:

0.0000467

AC:

AN:

1049286

Hom.:

Cov.:

AF XY:

0.0000440

AC XY:

AN XY:

340908

show subpopulations

African (AFR)

AF:

0.000282

AC:

AN:

24796

American (AMR)

AF:

0.00

AC:

AN:

27872

Ashkenazi Jewish (ASJ)

AF:

0.000807

AC:

AN:

18584

East Asian (EAS)

AF:

0.00

AC:

AN:

27037

South Asian (SAS)

AF:

0.0000603

AC:

AN:

49739

European-Finnish (FIN)

AF:

0.00

AC:

AN:

37570

Middle Eastern (MID)

AF:

0.000500

AC:

AN:

3997

European-Non Finnish (NFE)

AF:

0.0000221

AC:

AN:

815511

Other (OTH)

AF:

0.0000905

AC:

AN:

44180

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.521

Heterozygous variant carriers

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:

0.000136

AC:

AN:

110133

Hom.:

Cov.:

AF XY:

0.000153

AC XY:

AN XY:

32753

show subpopulations

African (AFR)

AF:

0.000396

AC:

AN:

30307

American (AMR)

AF:

0.00

AC:

AN:

10353

Ashkenazi Jewish (ASJ)

AF:

0.000762

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:

5921

Middle Eastern (MID)

AF:

0.00478

AC:

AN:

209

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

52466

Other (OTH)

AF:

0.00

AC:

AN:

1477

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.465

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

not provided

Uncertain:1Benign:1

Aug 05, 2020

GeneDx

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Aug 15, 2016

Eurofins Ntd Llc (ga)

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

FG syndrome

Uncertain:1

Dec 23, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This variant, c.6303_6308dup, results in the insertion of 2 amino acid(s) of the MED12 protein (p.Gln2114_Gln2115dup), 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. ClinVar contains an entry for this variant (Variation ID: 197488). 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. -

Familial thoracic aortic aneurysm and aortic dissection

Benign:1

Jul 27, 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. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

PhyloP100

2.3

Mutation Taster

=77/23

polymorphism

(source)

Splicing

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