6-10529416-G-A

Position:

• chr6-10529416-G-A

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PM2 PP3

The NM_145649.5(GCNT2):​c.505G>A​(p.Ala169Thr) 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 Pathogenic (no stars). Another nucleotide change resulting in same amino acid change has been previously reported as Likely benignin UniProt.

• Frequency: Genomes: not found (cov: 32)
• Consequence: GCNT2 NM_145649.5 missense
• Clinical Significance: Pathogenic no assertion criteria provided P:1
• Conservation: PhyloP100: 6.67

Genes affected

GCNT2 (HGNC:4204): (glucosaminyl (N-acetyl) transferase 2 (I blood group)) This gene encodes the enzyme responsible for formation of the blood group I antigen. The i and I antigens are distinguished by linear and branched poly-N-acetyllactosaminoglycans, respectively. The encoded protein is the I-branching enzyme, a beta-1,6-N-acetylglucosaminyltransferase responsible for the conversion of fetal i antigen to adult I antigen in erythrocytes during embryonic development. Mutations in this gene have been associated with adult i blood group phenotype. Alternatively spliced transcript variants encoding different isoforms have been described. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Uncertain_significance. Variant got 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.763

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
GCNT2	NM_145649.5	c.505G>A	p.Ala169Thr	missense_variant	3/5	ENST00000495262.7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
GCNT2	ENST00000495262.7	c.505G>A	p.Ala169Thr	missense_variant	3/5	2	NM_145649.5	P3

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1

Revision: no assertion criteria provided

Submissions by phenotype

ADULT i BLOOD GROUP PHENOTYPE Pathogenic:1

Pathogenic, no assertion criteria provided

literature only

OMIM

Mar 15, 2003

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Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.66
BayesDel_addAF	Pathogenic	0.24	D
BayesDel_noAF	Uncertain	0.11
CADD	Uncertain	25
DANN	Uncertain	1.0
DEOGEN2	Benign	0.13	T;T
Eigen	Pathogenic	0.69
Eigen_PC	Uncertain	0.60
FATHMM_MKL	Uncertain	0.92	D
M_CAP	Benign	0.052	D
MetaRNN	Pathogenic	0.76	D;D
MetaSVM	Benign	-0.87	T
MutationAssessor	Pathogenic	4.0	H;H
MutationTaster	Benign	1.0	A;A;A
PROVEAN	Uncertain	-4.0	D;D
REVEL	Uncertain	0.47
Sift4G	Pathogenic	0.0	D;D
Polyphen		0.96	D;D
Vest4		0.48
MutPred		0.86		Gain of phosphorylation at A169 (P = 0.0809);Gain of phosphorylation at A169 (P = 0.0809);
MVP		0.62
MPC		0.096
ClinPred		1.0	D
GERP RS		5.5
Varity_R		0.94
gMVP		0.49

Splicing

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Other links and lift over

dbSNP: rs137853339; hg19: chr6-10529649;