rs121918312

Positions:

• chr10-119672373-C-A
• chr10-119672373-C-T

Variant summary

Our verdict is Likely pathogenic. Variant got 7 ACMG points: 7P and 0B. PM2 PM5 PP3 PP5_Moderate

The NM_004281.4(BAG3):​c.626C>A​(p.Pro209Gln) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. P209L) has been classified as Pathogenic.

• Frequency: Genomes: not found (cov: 32)
• Consequence: BAG3 NM_004281.4 missense
• Clinical Significance: Pathogenic criteria provided, single submitter P:2
• Conservation: PhyloP100: 6.13

Genes affected

BAG3 (HGNC:939): (BAG cochaperone 3) BAG proteins compete with Hip for binding to the Hsc70/Hsp70 ATPase domain and promote substrate release. All the BAG proteins have an approximately 45-amino acid BAG domain near the C terminus but differ markedly in their N-terminal regions. The protein encoded by this gene contains a WW domain in the N-terminal region and a BAG domain in the C-terminal region. The BAG domains of BAG1, BAG2, and BAG3 interact specifically with the Hsc70 ATPase domain in vitro and in mammalian cells. All 3 proteins bind with high affinity to the ATPase domain of Hsc70 and inhibit its chaperone activity in a Hip-repressible manner. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Likely_pathogenic. Variant got 7 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr10-119672373-C-T is described in Lovd as [Pathogenic].
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.779
• PP5: Variant 10-119672373-C-A is Pathogenic according to our data. Variant chr10-119672373-C-A is described in ClinVar as [Pathogenic]. Clinvar id is 156530.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
BAG3	NM_004281.4	c.626C>A	p.Pro209Gln	missense_variant	3/4	ENST00000369085.8	NP_004272.2
BAG3	XM_005270287.2	c.626C>A	p.Pro209Gln	missense_variant	3/4		XP_005270344.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
BAG3	ENST00000369085.8	c.626C>A	p.Pro209Gln	missense_variant	3/4	1	NM_004281.4	ENSP00000358081.4
BAG3	ENST00000450186.1	c.452C>A	p.Pro151Gln	missense_variant	4/5	5		ENSP00000410036.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:2

Revision: criteria provided, single submitter

Submissions by phenotype

Myofibrillar myopathy 6 Pathogenic:1

Pathogenic, no assertion criteria provided

literature only

OMIM

Aug 01, 2014

- -

Myofibrillar myopathy 6;C3151293:Dilated cardiomyopathy 1HH Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Feb 27, 2023

This variant is not present in population databases (gnomAD no frequency). This sequence change replaces proline, which is neutral and non-polar, with glutamine, which is neutral and polar, at codon 209 of the BAG3 protein (p.Pro209Gln). This missense change has been observed in individual(s) with myofibrillar myopathy (PMID: 25208129). In at least one individual the variant was observed to be de novo. ClinVar contains an entry for this variant (Variation ID: 156530). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) has been performed at Invitae for this missense variant, however the output from this modeling did not meet the statistical confidence thresholds required to predict the impact of this variant on BAG3 protein function. Experimental studies have shown that this missense change affects BAG3 function (PMID: 30559338, 32472079). This variant disrupts the p.Pro209 amino acid residue in BAG3. Other variant(s) that disrupt this residue have been determined to be pathogenic (PMID: 19085932, 20605452, 21361913, 22734908, 25208129). This suggests that this residue is clinically significant, and that variants that disrupt this residue are likely to be disease-causing. For these reasons, this variant has been classified as Pathogenic. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.95
BayesDel_addAF	Pathogenic	0.48	D
BayesDel_noAF	Pathogenic	0.45
CADD	Pathogenic	27
DANN	Uncertain	0.99
DEOGEN2	Uncertain	0.67	D;T
Eigen	Pathogenic	0.86
Eigen_PC	Pathogenic	0.86
FATHMM_MKL	Pathogenic	0.97	D
LIST_S2	Uncertain	0.88	D;D
M_CAP	Benign	0.074	D
MetaRNN	Pathogenic	0.78	D;D
MetaSVM	Pathogenic	0.83	D
MutationAssessor	Uncertain	2.5	M;.
PrimateAI	Uncertain	0.74	T
PROVEAN	Uncertain	-3.4	D;D
REVEL	Pathogenic	0.66
Sift	Pathogenic	0.0	D;D
Sift4G	Pathogenic	0.0	D;D
Polyphen		1.0	D;.
Vest4		0.88
MutPred		0.60		Gain of sheet (P = 0.0477);.;
MVP		0.98
MPC		0.40
ClinPred		1.0	D
GERP RS		6.2
Varity_R		0.72
gMVP		0.67

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.15		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: rs121918312; hg19: chr10-121431885;