1-1232280-T-G

Variant names:

• chr1-1232280-T-G
• rs969701761
• NM_080605.4:c.2T>G

Variant summary

Our verdict is Pathogenic. The variant received 12 ACMG points: 12P and 0B. PVS1 PS1_Moderate PM2

The NM_080605.4(B3GALT6):​c.2T>G​(p.Met1?) variant causes a start lost change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000818 in 978,268 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: 𝑓 0.000014 (0 hom., cov: 32)
  • Exomes 𝑓: 0.0000072 (0 hom.)
• Consequence: B3GALT6 NM_080605.4 start_lost
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 1.18
• Publications: 0 publications found

Genes affected

B3GALT6 (HGNC:17978): (beta-1,3-galactosyltransferase 6) The enzyme encoded by this intronless gene is a beta-1,3-galactosyltransferase found in the medial Golgi apparatus, where it catalyzes the transfer of galactose from UDP-galactose to substrates containing a terminal beta-linked galactose moiety. The encoded enzyme has a particular affinity for galactose-beta-1,4-xylose found in the linker region of glycosamines. This enzyme is required for glycosaminoglycan synthesis. [provided by RefSeq, Jun 2013]

SDF4 (HGNC:24188): (stromal cell derived factor 4) This gene encodes a stromal cell derived factor that is a member of the CREC protein family. The encoded protein contains six EF-hand motifs and calcium-binding motifs. This protein localizes to the Golgi lumen and may be involved in regulating calcium dependent cellular activities. [provided by RefSeq, Sep 2011]

ACMG classification

Our verdict: Pathogenic. The variant received 12 ACMG points.

• PVS1: Start lost variant, next in-frame start position is after 7 pathogenic variants. Next in-frame start position is after 42 codons. Genomic position: 1232402. Lost 0.125 part of the original CDS.
• PS1: Another start lost variant in NM_080605.4 (B3GALT6) was described as [Likely_pathogenic] in ClinVar
• PM2: Very rare variant in population databases, with high coverage

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_080605.4. 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
	B3GALT6	NM_080605.4	MANE Select	c.2T>G	p.Met1?	start_lost	Exon 1 of 1	NP_542172.2	Q96L58

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	B3GALT6	ENST00000379198.5	TSL:6 MANE Select	c.2T>G	p.Met1?	start_lost	Exon 1 of 1	ENSP00000368496.2	Q96L58
	SDF4	ENST00000900948.1		c.-174-3334A>C		intron	N/A	ENSP00000571007.1
	SDF4	ENST00000263741.12	TSL:1	c.-563A>C		upstream_gene	N/A	ENSP00000263741.8	A0A5F9UJX7

Frequencies

GnomAD3 genomes AF: 0.0000139 AC: 2 AN: 144108 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000305

Gnomad OTH AF: 0.00

GnomAD4 exome AF: 0.00000719 AC: 6 AN: 834160 Hom.: 0 Cov.: 29 AF XY: 0.00000519 AC XY: 2 AN XY: 385392

African (AFR) AF: 0.00 AC: 0 AN: 15062

American (AMR) AF: 0.00 AC: 0 AN: 1038

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 5128

East Asian (EAS) AF: 0.00 AC: 0 AN: 3644

South Asian (SAS) AF: 0.0000580 AC: 1 AN: 17256

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 360

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 1628

European-Non Finnish (NFE) AF: 0.00000656 AC: 5 AN: 762746

Other (OTH) AF: 0.00 AC: 0 AN: 27298

GnomAD4 genome AF: 0.0000139 AC: 2 AN: 144108 Hom.: 0 Cov.: 32 AF XY: 0.00 AC XY: 0 AN XY: 70136

⚠️ The allele balance in gnomAD version 4 Genomes is significantly skewed from the expected value of 0.5.

African (AFR) AF: 0.00 AC: 0 AN: 39474

American (AMR) AF: 0.00 AC: 0 AN: 14632

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3372

East Asian (EAS) AF: 0.00 AC: 0 AN: 4944

South Asian (SAS) AF: 0.00 AC: 0 AN: 4782

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 8248

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 304

European-Non Finnish (NFE) AF: 0.0000305 AC: 2 AN: 65472

Other (OTH) AF: 0.00 AC: 0 AN: 1976

⚠️ The allele balance in gnomAD version 4 Genomes is significantly skewed from the expected value of 0.5. (p-value = 0.0296732), which strongly suggests a high chance of mosaicism in these individuals.

Alfa AF: 0.0000540 Hom.: 0

Bravo AF: 0.00000378

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.62	D
BayesDel_noAF	Uncertain	-0.070
CADD	Benign	22
DANN	Benign	0.85
DEOGEN2	Benign	0.0080	T
Eigen	Benign	-0.30
Eigen_PC	Benign	-0.35
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.90	D
M_CAP	Pathogenic	0.97	D
MetaRNN	Pathogenic	0.94	D
MetaSVM	Benign	-1.1	T
PhyloP100		1.2
PROVEAN	Benign	-1.5	N
REVEL	Benign	0.24
Sift	Pathogenic	0.0	D
Sift4G	Pathogenic	0.0	D
Polyphen		0.70	P
Vest4		0.78
MutPred		0.76		Gain of disorder (P = 0.0331)
MVP		0.59
ClinPred		0.99	D
GERP RS		2.4
PromoterAI		0.017	Neutral
Varity_R		0.97
gMVP		0.90
Mutation Taster		=28/172	disease causing

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: rs969701761; hg19: chr1-1167660;