7-134661754-A-T

Variant names:

• chr7-134661754-A-T
• NM_001724.5:c.247A>T

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM1 PM2

The NM_001724.5(BPGM):​c.247A>T​(p.Ser83Cys) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: BPGM NM_001724.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 6.08

Genes affected

BPGM (HGNC:1093): (bisphosphoglycerate mutase) 2,3-diphosphoglycerate (2,3-DPG) is a small molecule found at high concentrations in red blood cells where it binds to and decreases the oxygen affinity of hemoglobin. This gene encodes a multifunctional enzyme that catalyzes 2,3-DPG synthesis via its synthetase activity, and 2,3-DPG degradation via its phosphatase activity. The enzyme also has phosphoglycerate phosphomutase activity. Deficiency of this enzyme increases the affinity of cells for oxygen. Mutations in this gene result in hemolytic anemia. Multiple alternatively spliced variants, encoding the same protein, have been identified. [provided by RefSeq, Sep 2009]

LOC124901750 (HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 4 ACMG points.

• PM1: In a chain Bisphosphoglycerate mutase (size 257) in uniprot entity PMGE_HUMAN there are 4 pathogenic changes around while only 0 benign (100%) in NM_001724.5
• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
BPGM	NM_001724.5	c.247A>T	p.Ser83Cys	missense_variant	Exon 2 of 3	ENST00000344924.8	NP_001715.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
BPGM	ENST00000344924.8	c.247A>T	p.Ser83Cys	missense_variant	Exon 2 of 3	1	NM_001724.5	ENSP00000342032.3
BPGM	ENST00000393132.2	c.247A>T	p.Ser83Cys	missense_variant	Exon 3 of 4	5		ENSP00000376840.2
BPGM	ENST00000418040.5	c.247A>T	p.Ser83Cys	missense_variant	Exon 3 of 4	5		ENSP00000399838.1
BPGM	ENST00000443095.1	c.*13A>T		downstream_gene_variant		4		ENSP00000403050.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Sep 12, 2023

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.247A>T (p.S83C) alteration is located in exon 3 (coding exon 1) of the BPGM gene. This alteration results from a A to T substitution at nucleotide position 247, causing the serine (S) at amino acid position 83 to be replaced by a cysteine (C). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.064
BayesDel_addAF	Uncertain	0.073	D
BayesDel_noAF	Benign	-0.13
CADD	Pathogenic	26
DANN	Uncertain	0.99
DEOGEN2	Benign	0.35	T;T;T
Eigen	Uncertain	0.63
Eigen_PC	Pathogenic	0.67
FATHMM_MKL	Uncertain	0.96	D
LIST_S2	Uncertain	0.96	.;.;D
M_CAP	Benign	0.058	D
MetaRNN	Uncertain	0.57	D;D;D
MetaSVM	Uncertain	0.027	D
MutationAssessor	Benign	1.5	L;L;L
PrimateAI	Uncertain	0.55	T
PROVEAN	Uncertain	-2.6	D;D;D
REVEL	Uncertain	0.53
Sift	Uncertain	0.0010	D;D;D
Sift4G	Uncertain	0.021	D;D;D
Polyphen		0.99	D;D;D
Vest4		0.50
MutPred		0.49		Loss of disorder (P = 0.0276);Loss of disorder (P = 0.0276);Loss of disorder (P = 0.0276);
MVP		0.91
MPC		0.96
ClinPred		1.0	D
GERP RS		6.0
Varity_R		0.71
gMVP		0.80

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

No publications associated with this variant yet.

Other links and lift over

hg19: chr7-134346506;