NM_002044.4:c.137T>A

Variant names:

• chr15-49201245-T-A
• rs756918705
• NM_002044.4:c.137T>A

Variant summary

Our verdict is Likely pathogenic. The variant received 6 ACMG points: 6P and 0B. PM2 PP3_Strong

The NM_002044.4(GALK2):​c.137T>A​(p.Ile46Lys) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic 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. I46V) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 32)
• Consequence: GALK2 NM_002044.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 5.05
• Publications: 1 publications found

Genes affected

GALK2 (HGNC:4119): (galactokinase 2) This gene encodes a highly efficient N-acetylgalactosamine (GalNAc) kinase, which has galactokinase activity when galactose is present at high concentrations. The encoded protein is a member of the GHMP kinase family. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Jun 2017]

ENSG00000305168 (HGNC:):

ACMG classification

Our verdict: Likely_pathogenic. The variant received 6 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.973

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
GALK2	NM_002044.4	c.137T>A	p.Ile46Lys	missense_variant	Exon 2 of 10	ENST00000560031.6	NP_002035.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
GALK2	ENST00000560031.6	c.137T>A	p.Ile46Lys	missense_variant	Exon 2 of 10	1	NM_002044.4	ENSP00000453129.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 26

GnomAD4 genome Cov.: 32

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.00000378

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Dec 28, 2022

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.137T>A (p.I46K) alteration is located in exon 2 (coding exon 2) of the GALK2 gene. This alteration results from a T to A substitution at nucleotide position 137, causing the isoleucine (I) at amino acid position 46 to be replaced by a lysine (K). 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	Pathogenic	0.99
BayesDel_addAF	Pathogenic	0.43	D
BayesDel_noAF	Pathogenic	0.39
CADD	Pathogenic	28
DANN	Benign	0.96
DEOGEN2	Pathogenic	0.89	.;D;D;D;.;D;D;D
Eigen	Uncertain	0.64
Eigen_PC	Uncertain	0.60
FATHMM_MKL	Uncertain	0.91	D
LIST_S2	Uncertain	0.92	D;D;D;.;D;.;D;D
M_CAP	Pathogenic	0.48	D
MetaRNN	Pathogenic	0.97	D;D;D;D;D;D;D;D
MetaSVM	Pathogenic	0.91	D
MutationAssessor	Uncertain	2.5	.;.;M;.;.;.;.;.
PhyloP100		5.0
PrimateAI	Uncertain	0.73	T
PROVEAN	Uncertain	-3.8	D;D;D;D;D;D;D;D
REVEL	Pathogenic	0.91
Sift	Uncertain	0.0020	D;D;D;D;D;D;D;D
Sift4G	Pathogenic	0.0010	D;D;D;D;D;D;D;D
Polyphen		0.87	.;.;P;.;.;.;.;.
Vest4		0.91
MutPred		0.89		.;.;Loss of stability (P = 0.0077);.;.;.;.;.;
MVP		1.0
MPC		0.19
ClinPred		0.98	D
GERP RS		5.2
Varity_R		0.98
gMVP		0.96

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

Other links and lift over

dbSNP: rs756918705; hg19: chr15-49493442;