19-49818364-C-A

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM2

The NM_030973.4(MED25):c.23C>A(p.Pro8Gln) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000275 in 1,453,554 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. P8L) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000028 (0 hom.)
• Consequence: MED25 NM_030973.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.798

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]

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
MED25	NM_030973.4	c.23C>A	p.Pro8Gln	missense_variant	1/18	ENST00000312865.10
MED25	NM_001378355.1	c.23C>A	p.Pro8Gln	missense_variant	1/18

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
MED25	ENST00000312865.10	c.23C>A	p.Pro8Gln	missense_variant	1/18	1	NM_030973.4

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.00000275 AC: 4 AN: 1453554 Hom.: 0 Cov.: 34 AF XY: 0.00000554 AC XY: 4 AN XY: 722646

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

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: 0.00000361

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

GeneDx

Sep 29, 2017

The P8Q variant in the MED25 gene has not been reported previously as a pathogenic variant, nor as a benign variant, to our knowledge. The P8Q variant is not observed in large population cohorts (Lek et al., 2016). The P8Q variant is a non-conservative amino acid substitution, which is likely to impact secondary protein structure as these residues differ in polarity, charge, size and/or other properties. However, this substitution occurs at a position that is not conserved, and in silico analysis is inconsistent in its predictions as to whether or not the variant is damaging to the protein structure/function. We interpret P8Q as a variant of uncertain significance. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.12
BayesDel_addAF	Uncertain	0.075	D
BayesDel_noAF	Benign	-0.13
Cadd	Pathogenic	26
Dann	Uncertain	0.99
Eigen	Uncertain	0.27
Eigen_PC	Uncertain	0.30
FATHMM_MKL	Uncertain	0.79	D
LIST_S2	Uncertain	0.88	D;D;D;D;D;D;D;D;.
M_CAP	Pathogenic	0.73	D
MetaRNN	Uncertain	0.64	D;D;D;D;D;D;D;D;D
MetaSVM	Benign	-0.46	T
MutationTaster	Benign	0.81	D;N
PrimateAI	Pathogenic	0.87	D
Sift4G	Uncertain	0.0020	D;D;D;D;D;D;D;D;D
Polyphen		0.77	.;.;.;.;P;.;.;.;.
Vest4		0.43
MVP		0.69
MPC		1.1
ClinPred		0.98	D
GERP RS		3.6
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.3
Varity_R		0.24
gMVP		0.32

Splicing

Name	Calibrated prediction	Score	Prediction
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

Other links and lift over

dbSNP: rs980805046; hg19: chr19-50321621; COSMIC: COSV100457273; COSMIC: COSV100457273;