Variant NM_004048.4:c.3G>A details in Genebe, Genetics Data Aggregator

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PVS1_ModeratePM2

The NM_004048.4(B2M):c.3G>A(p.Met1?) variant causes a start lost change. The variant allele was found at a frequency of 0.000000684 in 1,461,534 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 6.8e-7 ( 0 hom. )

Consequence

B2M
NM_004048.4 start_lost

Scores

Clinical Significance

Likely pathogenic no assertion criteria provided P:10

Conservation

PhyloP100: 4.76

Variant links:

Genes affected

B2M (HGNC:914): (beta-2-microglobulin) This gene encodes a serum protein found in association with the major histocompatibility complex (MHC) class I heavy chain on the surface of nearly all nucleated cells. The protein has a predominantly beta-pleated sheet structure that can form amyloid fibrils in some pathological conditions. The encoded antimicrobial protein displays antibacterial activity in amniotic fluid. A mutation in this gene has been shown to result in hypercatabolic hypoproteinemia.[provided by RefSeq, Aug 2014]

B2M links:

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ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 4 ACMG points.

PVS1

Start lost variant, next in-frame start position is after 2 pathogenic variants. Next in-frame start position is after 354 CDS bases. Genomic position: 44716336. Lost 0.983 part of the original CDS.

PM2

Very rare variant in population databases, with high coverage;

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
B2M	NM_004048.4 link	c.3G>A	p.Met1?	start_lost	Exon 1 of 4	ENST00000648006.3	NP_004039.1	P61769
B2M	XM_005254549.4 link	c.3G>A	p.Met1?	start_lost	Exon 1 of 2		XP_005254606.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
B2M	ENST00000648006.3 link	c.3G>A	p.Met1?	start_lost	Exon 1 of 4		NM_004048.4	ENSP00000497910.1		P61769

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

6.84e-7

AC:

AN:

1461534

Hom.:

Cov.:

AF XY:

0.00000138

AC XY:

AN XY:

727090

show subpopulations

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:

8.99e-7

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

Cov.:

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:10

Revision: no assertion criteria provided

LINK: link

Submissions by phenotype

Small cell lung carcinoma

Pathogenic:1

Likely pathogenic, no assertion criteria provided

literature only

Database of Curated Mutations (DoCM)

May 31, 2016

- -

Multiple myeloma

Pathogenic:1

Likely pathogenic, no assertion criteria provided

literature only

Database of Curated Mutations (DoCM)

May 31, 2016

- -

Gastric adenocarcinoma

Pathogenic:1

Likely pathogenic, no assertion criteria provided

literature only

Database of Curated Mutations (DoCM)

May 31, 2016

- -

Squamous cell lung carcinoma

Pathogenic:1

Likely pathogenic, no assertion criteria provided

literature only

Database of Curated Mutations (DoCM)

May 31, 2016

- -

Lung adenocarcinoma

Pathogenic:1

Likely pathogenic, no assertion criteria provided

literature only

Database of Curated Mutations (DoCM)

May 31, 2016

- -

Ovarian serous cystadenocarcinoma

Pathogenic:1

Likely pathogenic, no assertion criteria provided

literature only

Database of Curated Mutations (DoCM)

May 31, 2016

- -

Non-Hodgkin lymphoma

Pathogenic:1

Likely pathogenic, no assertion criteria provided

literature only

Database of Curated Mutations (DoCM)

May 31, 2016

- -

Malignant melanoma of skin

Pathogenic:1

Likely pathogenic, no assertion criteria provided

literature only

Database of Curated Mutations (DoCM)

May 31, 2016

- -

Neoplasm of the large intestine

Pathogenic:1

Likely pathogenic, no assertion criteria provided

literature only

Database of Curated Mutations (DoCM)

May 31, 2016

- -

Squamous cell carcinoma of the head and neck

Pathogenic:1

Likely pathogenic, no assertion criteria provided

literature only

Database of Curated Mutations (DoCM)

May 31, 2016

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_addAF

Pathogenic

0.58

BayesDel_noAF

Uncertain

0.050

CADD

Uncertain

DANN

Uncertain

1.0

DEOGEN2

Benign

0.11

T;D;D;D

Eigen

Uncertain

0.28

Eigen_PC

Uncertain

0.25

FATHMM_MKL

Uncertain

0.95

M_CAP

Uncertain

0.12

MetaRNN

Pathogenic

0.98

D;D;D;D

MetaSVM

Benign

-0.93

PROVEAN

Benign

-2.1

N;N;N;.

REVEL

Benign

0.28

Sift

Pathogenic

0.0

D;D;D;.

Sift4G

Pathogenic

0.0

D;D;D;.

Polyphen

0.93

P;P;P;P

Vest4

0.84

MutPred

0.87

Loss of methylation at R3 (P = 0.0966);Loss of methylation at R3 (P = 0.0966);Loss of methylation at R3 (P = 0.0966);Loss of methylation at R3 (P = 0.0966);

MVP

0.90

ClinPred

0.98

GERP RS

5.3

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.1

Varity_R

0.96

gMVP

0.56

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

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