10-119672321-G-T

Position:

• chr10-119672321-G-T

Variant summary

Our verdict is Likely benign. Variant got -4 ACMG points: 0P and 4B. BS2

The NM_004281.4(BAG3):​c.574G>T​(p.Gly192Cys) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000752 in 1,461,796 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 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. G192S) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000075 (0 hom.)
• Consequence: BAG3 NM_004281.4 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:5
• Conservation: PhyloP100: 0.719

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_benign. Variant got -4 ACMG points.

• BS2: High AC in GnomAdExome4 at 11 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
BAG3	NM_004281.4	c.574G>T	p.Gly192Cys	missense_variant	3/4	ENST00000369085.8
BAG3	XM_005270287.2	c.574G>T	p.Gly192Cys	missense_variant	3/4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
BAG3	ENST00000369085.8	c.574G>T	p.Gly192Cys	missense_variant	3/4	1	NM_004281.4	P1
BAG3	ENST00000450186.1	c.400G>T	p.Gly134Cys	missense_variant	4/5	5

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD3 exomes AF: 0.0000200 AC: 5 AN: 249790 Hom.: 0 AF XY: 0.00000739 AC XY: 1 AN XY: 135396

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: 0.000164

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000752 AC: 11 AN: 1461796 Hom.: 0 Cov.: 32 AF XY: 0.00000550 AC XY: 4 AN XY: 727218

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: 0.000116

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.0000166

GnomAD4 genome Cov.: 32

ExAC AF: 0.00000824 AC: 1

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:5

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Uncertain:2

Uncertain significance, criteria provided, single submitter	clinical testing	CeGaT Center for Human Genetics Tuebingen	Mar 01, 2024	BAG3: PM2, BP4 -
Uncertain significance, criteria provided, single submitter	clinical testing	Revvity Omics, Revvity	Apr 11, 2022	- -

Myofibrillar myopathy 6;C3151293:Dilated cardiomyopathy 1HH Uncertain:2

Uncertain significance, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Apr 04, 2019	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. Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Probably Damaging"; Align-GVGD: "Class C15"). This variant has not been reported in the literature in individuals with BAG3-related conditions. This variant is present in population databases (rs201487919, ExAC 0.006%). This sequence change replaces glycine with cysteine at codon 192 of the BAG3 protein (p.Gly192Cys). The glycine residue is moderately conserved and there is a large physicochemical difference between glycine and cysteine. -
Uncertain significance, criteria provided, single submitter	clinical testing	Fulgent Genetics, Fulgent Genetics	Oct 06, 2021	- -

Myofibrillar myopathy 6 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Neuberg Centre For Genomic Medicine, NCGM

-

The missense variant c.574G>T (p.Gly192Cys) in BAG3 gene has not been reported previously as a pathogenic variant nor as a benign variant, to our knowledge. This variant has been reported to the ClinVar database as Uncertain Significance. The p.Gly192Cys variant is novel (not in any individuals) in 1000 Genomes and allele frequency of 0.002002% is reported in gnomAD . The amino acid Gly at position 192 is changed to a Cys changing protein sequence and it might alter its composition and physico-chemical properties. The variant is predicted to be damaging by both SIFT and PolyPhen2. The residue is conserved across species. The amino acid change p.Gly192Cys in BAG3 is predicted as conserved by GERP++ and PhyloP across 100 vertebrates. For these reasons, this variant has been classified as Uncertain Significance . -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.099
BayesDel_addAF	Benign	-0.15	T
BayesDel_noAF	Benign	-0.21
CADD	Benign	21
DANN	Uncertain	1.0
DEOGEN2	Benign	0.19	T;T
Eigen	Benign	-0.040
Eigen_PC	Benign	-0.13
FATHMM_MKL	Benign	0.59	D
LIST_S2	Benign	0.63	T;T
M_CAP	Benign	0.050	D
MetaRNN	Benign	0.22	T;T
MetaSVM	Benign	-0.70	T
MutationAssessor	Uncertain	2.3	M;.
MutationTaster	Benign	1.0	N
PrimateAI	Benign	0.47	T
PROVEAN	Benign	-2.1	N;N
REVEL	Benign	0.25
Sift	Benign	0.050	D;D
Sift4G	Uncertain	0.058	T;D
Polyphen		0.99	D;.
Vest4		0.56
MutPred		0.31		Loss of methylation at R193 (P = 0.0463);.;
MVP		0.88
MPC		0.41
ClinPred		0.72	D
GERP RS		2.2
Varity_R		0.10
gMVP		0.15

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.22		Details are displayed if max score is > 0.2
DS_AG_spliceai		0.22		Position offset: 5

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

Publications

LitVar

Other links and lift over

dbSNP: rs201487919; hg19: chr10-121431833;