chr1-1232300-T-C

Variant names:

• chr1-1232300-T-C
• rs794726955
• NM_080605.4:c.22T>C

Variant summary

Our verdict is Uncertain significance. The variant received 1 ACMG points: 3P and 2B. PM2 PP2 BP4_Moderate

The NM_080605.4(B3GALT6):​c.22T>C​(p.Trp8Arg) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000207 in 144,880 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/22 in silico tools predict a benign outcome for this variant. 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. W8G) has been classified as Uncertain significance.

• Frequency: Genomes: 𝑓 0.000021 (0 hom., cov: 33)
• Consequence: B3GALT6 NM_080605.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.519
• 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: Uncertain_significance. The variant received 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in the gene, where a lot of missense mutations are associated with disease in ClinVar. The gene has 12 curated pathogenic missense variants (we use a threshold of 10). The gene has 3 curated benign missense variants. Gene score misZ: 1.2608 (below the threshold of 3.09). Trascript score misZ: -4.8226 (below the threshold of 3.09). GenCC associations: The gene is linked to spondyloepimetaphyseal dysplasia with joint laxity, type 1, with or without fractures, Ehlers-Danlos syndrome, spondylodysplastic type, 2, spondyloepimetaphyseal dysplasia with joint laxity.
• BP4: Computational evidence support a benign effect (MetaRNN=0.20661822).

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.22T>C	p.Trp8Arg	missense	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.22T>C	p.Trp8Arg	missense	Exon 1 of 1	ENSP00000368496.2	Q96L58
	SDF4	ENST00000900948.1		c.-174-3354A>G		intron	N/A	ENSP00000571007.1
	SDF4	ENST00000900949.1		c.-968A>G		upstream_gene	N/A	ENSP00000571008.1

Frequencies

GnomAD3 genomes AF: 0.0000207 AC: 3 AN: 144880 Hom.: 0 Cov.: 33

Gnomad AFR AF: 0.0000744

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: 0.00

Gnomad OTH AF: 0.00

GnomAD4 exome Cov.: 29

GnomAD4 genome AF: 0.0000207 AC: 3 AN: 144880 Hom.: 0 Cov.: 33 AF XY: 0.00 AC XY: 0 AN XY: 70448

African (AFR) AF: 0.0000744 AC: 3 AN: 40344

American (AMR) AF: 0.00 AC: 0 AN: 14650

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3382

East Asian (EAS) AF: 0.00 AC: 0 AN: 4936

South Asian (SAS) AF: 0.00 AC: 0 AN: 4742

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 8286

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 300

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 65354

Other (OTH) AF: 0.00 AC: 0 AN: 1990

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.0000340

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.20
BayesDel_addAF	Benign	-0.16	T
BayesDel_noAF	Benign	-0.47
CADD	Benign	19
DANN	Benign	0.78
DEOGEN2	Benign	0.0069	T
Eigen	Benign	-0.51
Eigen_PC	Benign	-0.37
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Benign	0.27	T
M_CAP	Pathogenic	0.62	D
MetaRNN	Benign	0.21	T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	1.5	L
PhyloP100		0.52
PrimateAI	Pathogenic	0.86	D
PROVEAN	Benign	-0.72	N
REVEL	Benign	0.089
Sift	Benign	0.14	T
Sift4G	Benign	0.19	T
Polyphen		0.0	B
Vest4		0.14
MutPred		0.59		Gain of disorder (P = 0)
MVP		0.54
MPC		1.5
ClinPred		0.20	T
GERP RS		3.5
PromoterAI		-0.085	Neutral
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		2.6
Varity_R		0.15
gMVP		0.58
Mutation Taster		=80/20	polymorphism

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: rs794726955; hg19: chr1-1167680;