chr1-235484412-G-C

Variant names:

• chr1-235484412-G-C
• rs138058326
• NM_152490.5:c.465C>G

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PM2

The NM_152490.5(B3GALNT2):​c.465C>G​(p.Ile155Met) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,878 control chromosomes in the GnomAD database, with no homozygous occurrence. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. I155V) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: B3GALNT2 NM_152490.5 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.567
• Publications: 0 publications found

Genes affected

B3GALNT2 (HGNC:28596): (beta-1,3-N-acetylgalactosaminyltransferase 2) This gene encodes a member of the glycosyltransferase 31 family. The encoded protein synthesizes GalNAc:beta-1,3GlcNAc, a novel carbohydrate structure, on N- and O-glycans. Alternatively spliced transcript variants that encode different isoforms have been described. [provided by RefSeq, Mar 2013]

B3GALNT2 Gene-Disease associations (from GenCC):

• muscular dystrophy-dystroglycanopathy (congenital with brain and eye anomalies), type a, 11

  Inheritance: AR Classification: DEFINITIVE, STRONG, MODERATE Submitted by: G2P, Labcorp Genetics (formerly Invitae), Genomics England PanelApp, Ambry Genetics
• autosomal recessive non-syndromic intellectual disability

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
• muscle-eye-brain disease

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
• muscular dystrophy-dystroglycanopathy, type A

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
• intellectual disability

  Inheritance: AR Classification: LIMITED Submitted by: Ambry Genetics

ACMG classification

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_152490.5. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	B3GALNT2	NM_152490.5	MANE Select	c.465C>G	p.Ile155Met	missense	Exon 4 of 12	NP_689703.1	Q8NCR0-1
	B3GALNT2	NM_001277155.3		c.588C>G	p.Ile196Met	missense	Exon 5 of 8	NP_001264084.1	Q8NCR0-2

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	B3GALNT2	ENST00000366600.8	TSL:1 MANE Select	c.465C>G	p.Ile155Met	missense	Exon 4 of 12	ENSP00000355559.3	Q8NCR0-1
	B3GALNT2	ENST00000313984.3	TSL:1	c.588C>G	p.Ile196Met	missense	Exon 5 of 8	ENSP00000315678.3	Q8NCR0-2
	B3GALNT2	ENST00000954792.1		c.588C>G	p.Ile196Met	missense	Exon 5 of 13	ENSP00000624851.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461878 Hom.: 0 Cov.: 32 AF XY: 0.00 AC XY: 0 AN XY: 727236

African (AFR) AF: 0.00 AC: 0 AN: 33478

American (AMR) AF: 0.00 AC: 0 AN: 44724

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26136

East Asian (EAS) AF: 0.00 AC: 0 AN: 39696

South Asian (SAS) AF: 0.00 AC: 0 AN: 86256

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53420

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5768

European-Non Finnish (NFE) AF: 8.99e-7 AC: 1 AN: 1112004

Other (OTH) AF: 0.00 AC: 0 AN: 60396

GnomAD4 genome Cov.: 33

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.13
BayesDel_addAF	Uncertain	0.081	D
BayesDel_noAF	Benign	-0.12
CADD	Benign	14
DANN	Uncertain	0.99
DEOGEN2	Benign	0.11	T
Eigen	Benign	-0.19
Eigen_PC	Benign	-0.41
FATHMM_MKL	Benign	0.34	N
M_CAP	Benign	0.052	D
MetaRNN	Uncertain	0.61	D
MetaSVM	Benign	-0.50	T
MutationAssessor	Uncertain	2.3	M
PhyloP100		-0.57
PrimateAI	Uncertain	0.52	T
PROVEAN	Benign	-1.7	N
REVEL	Benign	0.24
Sift	Uncertain	0.0030	D
Sift4G	Uncertain	0.015	D
Polyphen		0.99	D
Vest4		0.70
MutPred		0.30		Gain of catalytic residue at V151 (P = 0.0778)
MVP		0.75
MPC		0.80
ClinPred		0.97	D
GERP RS		-3.1
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.24
gMVP		0.73
Mutation Taster		=77/23	polymorphism

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		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: rs138058326; hg19: chr1-235647728;