chrX-71140758-ACAGCAGCAACAGCAACAGCAGCAG-A

Variant names:

Variant summary

Our verdict is Likely benign. The variant received -1 ACMG points: 0P and 1B. BP3

The NM_005120.3(MED12):c.6201_6224delACAGCAACAGCAGCAGCAGCAGCA(p.Gln2068_Gln2075del) variant causes a disruptive inframe deletion change. The variant allele was found at a frequency of 0.0000183 in 109,122 control chromosomes in the GnomAD database, with no homozygous occurrence. There are no hemizygote samples in GnomAD. It is difficult to determine the true allele frequency of this variant because it is of type DEL_BIG, and the frequency of such variant types in population databases may be underestimated and unreliable. Variant has been reported in ClinVar as Uncertain significance (★). Synonymous variant affecting the same amino acid position (i.e. Q2067Q) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.000018 ( 0 hom., 0 hem., cov: 22)

Exomes 𝑓: 0.000014 ( 0 hom. 2 hem. )

Failed GnomAD Quality Control

Consequence

MED12
NM_005120.3 disruptive_inframe_deletion

Scores

Not classified

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 6.66

Publications

0 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 -1 ACMG points.

BP3

Nonframeshift variant in repetitive region in NM_005120.3

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MED12	NM_005120.3 link	c.6201_6224delACAGCAACAGCAGCAGCAGCAGCA	p.Gln2068_Gln2075del	disruptive_inframe_deletion	Exon 42 of 45	ENST00000374080.8	NP_005111.2	Q93074-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
MED12	ENST00000374080.8 link	c.6201_6224delACAGCAACAGCAGCAGCAGCAGCA	p.Gln2068_Gln2075del	disruptive_inframe_deletion	Exon 42 of 45	1	NM_005120.3	ENSP00000363193.3		Q93074-1

Frequencies

GnomAD3 genomes

AF:

0.0000183

AC:

AN:

109122

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000335

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:

0.0000191

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.00000558

AC:

AN:

179249

AF XY:

0.00

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000126

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

Data not reliable, filtered out with message: AS_VQSR

AF:

0.0000137

AC:

AN:

1097265

Hom.:

AF XY:

0.00000551

AC XY:

AN XY:

362793

show subpopulations

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

African (AFR)

AF:

0.0000379

AC:

AN:

26381

American (AMR)

AF:

0.00

AC:

AN:

35203

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

19374

East Asian (EAS)

AF:

0.00

AC:

AN:

30202

South Asian (SAS)

AF:

0.0000185

AC:

AN:

54112

European-Finnish (FIN)

AF:

0.0000248

AC:

AN:

40243

Middle Eastern (MID)

AF:

0.00

AC:

AN:

4130

European-Non Finnish (NFE)

AF:

0.0000131

AC:

AN:

841563

Other (OTH)

AF:

0.0000217

AC:

AN:

46057

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0.000001), which strongly suggests a high chance of mosaicism in these individuals.

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.356

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

AF:

0.0000183

AC:

AN:

109122

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

31870

show subpopulations

African (AFR)

AF:

0.0000335

AC:

AN:

29890

American (AMR)

AF:

0.00

AC:

AN:

10156

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

2616

East Asian (EAS)

AF:

0.00

AC:

AN:

3442

South Asian (SAS)

AF:

0.00

AC:

AN:

2536

European-Finnish (FIN)

AF:

0.00

AC:

AN:

5843

Middle Eastern (MID)

AF:

0.00

AC:

AN:

231

European-Non Finnish (NFE)

AF:

0.0000191

AC:

AN:

52285

Other (OTH)

AF:

0.00

AC:

AN:

1450

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.425

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Alfa

AF:

0.000169

Hom.:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

FG syndrome

Uncertain:1

Sep 23, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This variant, c.6201_6224del, results in the deletion of 8 amino acid(s) of the MED12 protein (p.Gln2069_Gln2076del), 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: 408883). 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. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

PhyloP100

6.7

Mutation Taster

=121/79

polymorphism

(source)

Splicing

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

Publications

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chrX-71140758-ACAGCAGCAACAGCAACAGCAGCAG-A

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