rs371817340

Positions:

chr19-49830147-G-A

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2BP4_Moderate

The NM_030973.4(MED25):c.748G>A(p.Ala250Thr) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000748 in 1,603,346 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Synonymous variant affecting the same amino acid position (i.e. A250A) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.000020 ( 0 hom., cov: 32)

Exomes 𝑓: 0.0000062 ( 0 hom. )

Consequence

MED25
NM_030973.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 0.516

Variant links:

Genes affected

MED25 (HGNC:28845): (mediator complex subunit 25) This gene encodes a component of the transcriptional coactivator complex termed the Mediator complex. This complex is required for transcription of most RNA polymerase II-dependent genes. The encoded protein plays a role in chromatin modification and in preinitiation complex assembly. Mutations in this gene are associated with Charcot-Marie-Tooth disease type 2B2. [provided by RefSeq, Apr 2010]

MED25 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 0 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.07526219).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
MED25	NM_030973.4 linkuse as main transcript	c.748G>A	p.Ala250Thr	missense_variant	7/18	ENST00000312865.10
MED25	NM_001378355.1 linkuse as main transcript	c.748G>A	p.Ala250Thr	missense_variant	7/18

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
MED25	ENST00000312865.10 linkuse as main transcript	c.748G>A	p.Ala250Thr	missense_variant	7/18	1	NM_030973.4		Q71SY5-1
MED25	ENST00000538643.5 linkuse as main transcript	c.181-364G>A		intron_variant		1			Q71SY5-6
MED25	ENST00000595185.5 linkuse as main transcript	c.688+199G>A		intron_variant		1
MED25	ENST00000593767.3 linkuse as main transcript	c.748G>A	p.Ala250Thr	missense_variant	7/18	3		P1

Frequencies

GnomAD3 genomes

AF:

0.0000198

AC:

AN:

151594

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

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:

0.0000442

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000164

AC:

AN:

244126

Hom.:

AF XY:

0.00000751

AC XY:

AN XY:

133142

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000581

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:

0.0000182

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000620

AC:

AN:

1451752

Hom.:

Cov.:

AF XY:

0.00000554

AC XY:

AN XY:

722514

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.0000449

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00000633

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.0000198

AC:

AN:

151594

Hom.:

Cov.:

AF XY:

0.0000270

AC XY:

AN XY:

73992

show subpopulations

Gnomad4 AFR

AF:

0.00

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:

0.0000442

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.0000151

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000117

AC:

ExAC

AF:

0.0000330

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

Charcot-Marie-Tooth disease type 2

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Jul 16, 2023

This sequence change replaces alanine, which is neutral and non-polar, with threonine, which is neutral and polar, at codon 250 of the MED25 protein (p.Ala250Thr). This variant is present in population databases (rs371817340, gnomAD 0.006%). This variant has not been reported in the literature in individuals affected with MED25-related conditions. ClinVar contains an entry for this variant (Variation ID: 565712). Algorithms developed to predict the effect of missense changes on protein structure and function output the following: SIFT: "Not Available"; PolyPhen-2: "Possibly Damaging"; Align-GVGD: "Not Available". The threonine amino acid residue is found in multiple mammalian species, which suggests that this missense change does not adversely affect protein function. 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

AlphaMissense

Benign

0.068

BayesDel_addAF

Benign

-0.28

BayesDel_noAF

Benign

-0.46

CADD

Benign

DANN

Uncertain

0.98

DEOGEN2

Benign

0.28

.;T

Eigen

Benign

-0.57

Eigen_PC

Benign

-0.60

FATHMM_MKL

Benign

0.15

LIST_S2

Benign

0.68

T;T

M_CAP

Benign

0.020

MetaRNN

Benign

0.075

T;T

MetaSVM

Benign

-1.0

MutationAssessor

Benign

0.55

.;N

MutationTaster

Benign

1.0

N;N

PrimateAI

Uncertain

0.60

PROVEAN

Benign

-0.63

.;N

REVEL

Benign

0.11

Sift

Benign

0.28

.;T

Sift4G

Benign

0.31

T;T

Polyphen

0.31

.;B

Vest4

0.22

MVP

0.56

MPC

0.88

ClinPred

0.080

GERP RS

2.8

Varity_R

0.032

gMVP

0.25

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.040

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