chr3-49722628-T-C

Position:

• chr3-49722628-T-C

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 2P and 1B. PM2 BP4

The NM_021971.4(GMPPB):​c.529A>G​(p.Ile177Val) variant causes a missense change. The variant allele was found at a frequency of 0.00000342 in 1,461,782 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 13/23 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Synonymous variant affecting the same amino acid position (i.e. I177I) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000034 (0 hom.)
• Consequence: GMPPB NM_021971.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 4.87

Genes affected

GMPPB (HGNC:22932): (GDP-mannose pyrophosphorylase B) This gene is thought to encode a GDP-mannose pyrophosphorylase. The encoded protein catalyzes the conversion of mannose-1-phosphate and GTP to GDP-mannose, a reaction involved in the production of N-linked oligosaccharides. Alternatively spliced transcript variants encoding distinct isoforms have been described. [provided by RefSeq, Jan 2009]

ACMG classification

Verdict is Uncertain_significance. Variant got 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.29029667).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
GMPPB	NM_021971.4	c.529A>G	p.Ile177Val	missense_variant	5/9	ENST00000308388.7
GMPPB	NM_013334.4	c.529A>G	p.Ile177Val	missense_variant	5/8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
GMPPB	ENST00000308388.7	c.529A>G	p.Ile177Val	missense_variant	5/9	1	NM_021971.4	P1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.00000342 AC: 5 AN: 1461782 Hom.: 0 Cov.: 33 AF XY: 0.00000138 AC XY: 1 AN XY: 727180

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.0000224

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: 0.00000360

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Global developmental delay Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Claritas Genomics

Feb 21, 2017

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.13
BayesDel_addAF	Benign	-0.16	T
BayesDel_noAF	Benign	-0.38
CADD	Benign	19
DANN	Uncertain	0.97
DEOGEN2	Uncertain	0.47	T;.;T
Eigen	Benign	-0.29
Eigen_PC	Benign	-0.13
FATHMM_MKL	Uncertain	0.92	D
LIST_S2	Uncertain	0.90	.;D;D
M_CAP	Benign	0.022	T
MetaRNN	Benign	0.29	T;T;T
MetaSVM	Benign	-0.93	T
MutationAssessor	Benign	0.69	N;N;N
MutationTaster	Benign	1.0	D;D;D;D
PrimateAI	Uncertain	0.57	T
PROVEAN	Benign	-0.91	N;N;N
REVEL	Benign	0.099
Sift	Benign	0.19	T;T;T
Sift4G	Benign	0.63	T;T;T
Polyphen		0.081	B;B;B
Vest4		0.19
MutPred		0.69		Loss of helix (P = 0.0444);Loss of helix (P = 0.0444);Loss of helix (P = 0.0444);
MVP		0.70
MPC		0.46
ClinPred		0.18	T
GERP RS		3.4
Varity_R		0.27
gMVP		0.51

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.20		Details are displayed if max score is > 0.2
DS_DG_spliceai		0.20		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: rs1060499721; hg19: chr3-49760061;