Genetic Variant GCNT2:c.1018+15C>T (chr6-10621458-C-T) – ACMG Classification: Likely_benign (-2 pts)

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 2P and 4B. PM2BP4_Strong

The NM_145649.5(GCNT2):c.1018+15C>T variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000216 in 1,388,984 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 0.0000022 ( 0 hom. )

Consequence

GCNT2
NM_145649.5 intron

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 0.293

Publications

0 publications found

Variant links:

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]

GCNT2 Gene-Disease associations (from GenCC):

cataract 13 with adult I phenotype
Inheritance: AR Classification: DEFINITIVE, STRONG, MODERATE Submitted by: Labcorp Genetics (formerly Invitae), G2P, Ambry Genetics
total early-onset cataract
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

GCNT2 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.85).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_145649.5. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Gene	Transcript	Tags	HGVSc	Effect	Exon Rank	Protein	UniProt
GCNT2	NM_145649.5	MANE Select	c.1018+15C>T	intron	N/A	NP_663624.1	Q8N0V5-1
GCNT2	NM_001491.3	MANE Plus Clinical	c.1012+15C>T	intron	N/A	NP_001482.1	Q8N0V5-2
GCNT2	NM_001374747.1		c.1018+15C>T	intron	N/A	NP_001361676.1	Q8N0V5-1

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	Effect	Exon Rank	Protein	UniProt
GCNT2	ENST00000495262.7	TSL:2 MANE Select	c.1018+15C>T	intron	N/A	ENSP00000419411.2	Q8N0V5-1
GCNT2	ENST00000316170.9	TSL:1 MANE Plus Clinical	c.1012+15C>T	intron	N/A	ENSP00000314844.3	Q8N0V5-2
GCNT2	ENST00000265012.5	TSL:1	c.1018+15C>T	intron	N/A	ENSP00000265012.4	Q8N0V5-3

Frequencies

GnomAD3 genomes

Cov.:

GnomAD2 exomes

AF:

0.00000404

AC:

AN:

247644

AF XY:

0.00000747

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000292

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000216

AC:

AN:

1388984

Hom.:

Cov.:

AF XY:

0.00000288

AC XY:

AN XY:

694880

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

32164

American (AMR)

AF:

0.0000225

AC:

AN:

44472

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

25614

East Asian (EAS)

AF:

0.0000509

AC:

AN:

39314

South Asian (SAS)

AF:

0.00

AC:

AN:

84566

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53282

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5612

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

1046028

Other (OTH)

AF:

0.00

AC:

AN:

57932

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.508

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

Cov.:

Alfa

AF:

0.00

Hom.:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.85

CADD

Benign

1.9

(source)

DANN

Benign

0.61

PhyloP100

0.29

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

You must be logged in to view publications. This limit was set because tens of millions (!) of queries from AI bots are generated daily.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over