1-63593512-G-T

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_002633.3(PGM1):c.24G>T(p.Lys8Asn) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 14/18 in silico tools predict 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. K8R) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 32)
• Consequence: PGM1 NM_002633.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 2.57

Genes affected

PGM1 (HGNC:8905): (phosphoglucomutase 1) The protein encoded by this gene is an isozyme of phosphoglucomutase (PGM) and belongs to the phosphohexose mutase family. There are several PGM isozymes, which are encoded by different genes and catalyze the transfer of phosphate between the 1 and 6 positions of glucose. In most cell types, this PGM isozyme is predominant, representing about 90% of total PGM activity. In red cells, PGM2 is a major isozyme. This gene is highly polymorphic. Mutations in this gene cause glycogen storage disease type 14. Alternativley spliced transcript variants encoding different isoforms have been identified in this gene.[provided by RefSeq, Mar 2010]

ITGB3BP (HGNC:6157): (integrin subunit beta 3 binding protein) This gene encodes a transcriptional coregulator that binds to and enhances the activity of members of the nuclear receptor families, thyroid hormone receptors and retinoid X receptors. This protein also acts as a corepressor of NF-kappaB-dependent signaling. This protein induces apoptosis in breast cancer cells through a caspase 2-mediated signaling pathway. This protein is also a component of the centromere-specific histone H3 variant nucleosome associated complex (CENP-NAC) and may be involved in mitotic progression by recruiting the histone H3 variant CENP-A to the centromere. Alternate splicing results in multiple transcript variants. [provided by RefSeq, Sep 2011]

ACMG classification

Verdict is Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.22755101).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
PGM1	NM_002633.3	c.24G>T	p.Lys8Asn	missense_variant	1/11	ENST00000371084.8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
PGM1	ENST00000371084.8	c.24G>T	p.Lys8Asn	missense_variant	1/11	1	NM_002633.3	P1
PGM1	ENST00000650546.1	c.24G>T	p.Lys8Asn	missense_variant	1/12
ITGB3BP	ENST00000478138.1	n.197+13C>A		intron_variant, non_coding_transcript_variant		3

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

PGM1-congenital disorder of glycosylation Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Aug 10, 2023

This sequence change replaces lysine, which is basic and polar, with asparagine, which is neutral and polar, at codon 8 of the PGM1 protein (p.Lys8Asn). This variant is not present in population databases (gnomAD no frequency). This variant has not been reported in the literature in individuals affected with PGM1-related conditions. An algorithm developed to predict the effect of missense changes on protein structure and function (PolyPhen-2) suggests that this variant is likely to be tolerated. 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. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.24
BayesDel_addAF	Benign	-0.14	T
BayesDel_noAF	Benign	-0.45
Cadd	Benign	22
Dann	Uncertain	0.99
DEOGEN2	Benign	0.30	T;.
Eigen	Benign	-0.14
Eigen_PC	Benign	0.0078
FATHMM_MKL	Benign	0.62	D
LIST_S2	Benign	0.82	T;T
M_CAP	Benign	0.054	D
MetaRNN	Benign	0.23	T;T
MetaSVM	Benign	-0.98	T
MutationAssessor	Benign	1.4	L;.
MutationTaster	Benign	1.0	N
PROVEAN	Benign	-0.79	N;.
REVEL	Benign	0.098
Sift	Benign	0.14	T;.
Sift4G	Benign	0.14	T;.
Polyphen		0.0	B;.
Vest4		0.41
MutPred		0.40		Loss of methylation at K8 (P = 0.0042);Loss of methylation at K8 (P = 0.0042);
MVP		0.75
ClinPred		0.79	D
GERP RS		4.4
Varity_R		0.51

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: chr1-64059183;