rs750162341

Positions:

Variant summary

Our verdict is Benign. Variant got -8 ACMG points: 0P and 8B. BP4_StrongBS2

The NM_005120.3(MED12):c.4253+4G>A variant causes a splice region, intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000621 in 1,208,424 control chromosomes in the GnomAD database, with no homozygous occurrence. There are 25 hemizygotes in GnomAD. In-silico tool predicts a benign outcome for this variant. 3/3 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Uncertain significance (★★).

Frequency

Genomes: 𝑓 0.000045 ( 0 hom., 2 hem., cov: 22)

Exomes 𝑓: 0.000064 ( 0 hom. 23 hem. )

Consequence

MED12
NM_005120.3 splice_region, intron

Scores

Splicing: ADA: 0.0001777

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:3

Conservation

PhyloP100: 2.80

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 links:

MED12 (HGNC:):

MED12 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Benign. Variant got -8 ACMG points.

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.73).

BS2

High Hemizygotes in GnomAd4 at 2 XL gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
MED12	NM_005120.3 linkuse as main transcript	c.4253+4G>A		splice_region_variant, intron_variant		ENST00000374080.8	NP_005111.2	Q93074-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
MED12	ENST00000374080.8 linkuse as main transcript	c.4253+4G>A		splice_region_variant, intron_variant		1	NM_005120.3	ENSP00000363193.3		Q93074-1

Frequencies

GnomAD3 genomes

AF:

0.0000445

AC:

AN:

112278

Hom.:

Cov.:

AF XY:

0.0000581

AC XY:

AN XY:

34440

show subpopulations

Gnomad AFR

AF:

0.0000647

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:

0.0000564

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000112

AC:

AN:

179108

Hom.:

AF XY:

0.0000154

AC XY:

AN XY:

65078

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 SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000125

Gnomad OTH exome

AF:

0.000227

GnomAD4 exome

AF:

0.0000639

AC:

AN:

1096146

Hom.:

Cov.:

AF XY:

0.0000636

AC XY:

AN XY:

361572

show subpopulations

Gnomad4 AFR exome

AF:

0.0000379

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000186

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000761

Gnomad4 OTH exome

AF:

0.0000652

GnomAD4 genome

AF:

0.0000445

AC:

AN:

112278

Hom.:

Cov.:

AF XY:

0.0000581

AC XY:

AN XY:

34440

show subpopulations

Gnomad4 AFR

AF:

0.0000647

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000564

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000712

Hom.:

Bravo

AF:

0.0000302

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:3

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Familial thoracic aortic aneurysm and aortic dissection

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Jan 04, 2024

The c.4253+4G>A intronic variant results from a G to A substitution 4 nucleotides after coding exon 30 in the MED12 gene. Based on data from gnomAD, the A allele has an overall frequency of 0.0015% (3/201088) total alleles studied, with 1 hemizygote(s) observed. The highest observed frequency was 0.0022% (2/90975) of European (non-Finnish) alleles. This nucleotide position is not well conserved in available vertebrate species. In silico splice site analysis predicts that this alteration will not have any significant effect on splicing. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. -

See cases

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Laboratorio de Genetica e Diagnostico Molecular, Hospital Israelita Albert Einstein

Dec 18, 2020

ACMG classification criteria: PM2, BP4 -

FG syndrome

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jan 26, 2024

This sequence change falls in intron 30 of the MED12 gene. It does not directly change the encoded amino acid sequence of the MED12 protein. It affects a nucleotide within the consensus splice site. This variant is present in population databases (rs750162341, gnomAD 0.002%), including at least one homozygous and/or hemizygous individual. 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: 264566). Variants that disrupt the consensus splice site are a relatively common cause of aberrant splicing (PMID: 17576681, 9536098). Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant is not likely to affect RNA splicing. 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

BayesDel_noAF

Benign

-0.73

CADD

Benign

DANN

Benign

0.65

Splicing

Name

Calibrated prediction

Score

Prediction

dbscSNV1_ADA

Benign

0.00018

dbscSNV1_RF

Benign

0.040

SpliceAI score (max)

0.0

Details are displayed if max score is > 0.2

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

Publications

LitVar

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over