chr1-230067353-T-G

Position:

• chr1-230067353-T-G

Variant summary

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

The NM_004481.5(GALNT2):​c.73T>G​(p.Ser25Ala) 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. 14/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: GALNT2 NM_004481.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.59

Genes affected

GALNT2 (HGNC:4124): (polypeptide N-acetylgalactosaminyltransferase 2) This gene encodes a member of the glycosyltransferase 2 protein family. Members of this family initiate mucin-type O-glycoslation of peptides in the Golgi apparatus. The encoded protein may be involved in O-linked glycosylation of the immunoglobulin A1 hinge region. This gene may influence triglyceride levels, and may be involved Type 2 diabetes, as well as several types of cancer. Alternative splicing results in multiple transcript variants. [provided by RefSeq, May 2014]

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=0.26304793).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
GALNT2	NM_004481.5	c.73T>G	p.Ser25Ala	missense_variant	1/16	ENST00000366672.5
GALNT2	NM_001291866.2	c.12+9275T>G		intron_variant
GALNT2	NR_120373.2	n.116T>G		non_coding_transcript_exon_variant	1/2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
GALNT2	ENST00000366672.5	c.73T>G	p.Ser25Ala	missense_variant	1/16	1	NM_004481.5	P1
GALNT2	ENST00000488903.1	n.95T>G		non_coding_transcript_exon_variant	1/2	2
GALNT2	ENST00000494106.1	n.89+9275T>G		intron_variant, non_coding_transcript_variant		5

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

not provided Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jun 23, 2021

This sequence change replaces serine with alanine at codon 25 of the GALNT2 protein (p.Ser25Ala). The serine residue is moderately conserved and there is a moderate physicochemical difference between serine and alanine. The frequency data for this variant in the population databases is considered unreliable, as metrics indicate insufficient coverage at this position in the ExAC database. 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 (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be tolerated, but these predictions have not been confirmed by published functional studies and their clinical significance is uncertain. This variant has not been reported in the literature in individuals with GALNT2-related conditions. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.094
BayesDel_addAF	Benign	-0.14	T
BayesDel_noAF	Benign	-0.44
CADD	Benign	23
DANN	Benign	0.88
DEOGEN2	Benign	0.020	T
Eigen	Benign	-0.41
Eigen_PC	Benign	-0.31
FATHMM_MKL	Benign	0.59	D
LIST_S2	Benign	0.36	T
M_CAP	Pathogenic	0.95	D
MetaRNN	Benign	0.26	T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	1.9	L
MutationTaster	Benign	0.73	D;D;D
PrimateAI	Pathogenic	0.93	D
PROVEAN	Benign	-0.60	N
REVEL	Benign	0.11
Sift	Benign	0.36	T
Sift4G	Benign	0.64	T
Polyphen		0.027	B
Vest4		0.25
MutPred		0.46		Loss of glycosylation at S25 (P = 0.0013);
MVP		0.52
MPC		0.45
ClinPred		0.15	T
GERP RS		2.5
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.8
Varity_R		0.11
gMVP		0.54

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.17		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: chr1-230203100;