NM_080605.4:c.649G>T

Variant names:

• chr1-1232927-G-T
• rs397514724
• NM_080605.4:c.649G>T

Variant summary

Our verdict is Likely pathogenic. The variant received 9 ACMG points: 9P and 0B. PM2 PM5 PP2 PP3_Strong

The NM_080605.4(B3GALT6):​c.649G>T​(p.Gly217Cys) variant causes a missense change. The variant allele was found at a frequency of 0.000000708 in 1,412,722 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. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. G217S) has been classified as Pathogenic.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 7.1e-7 (0 hom.)
• Consequence: B3GALT6 NM_080605.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 6.66
• 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: Likely_pathogenic. The variant received 9 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr1-1232927-G-A is described in ClinVar as Pathogenic. ClinVar VariationId is 60496.Status of the report is no_assertion_criteria_provided, 0 stars.
• 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.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.976

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.649G>T	p.Gly217Cys	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.649G>T	p.Gly217Cys	missense	Exon 1 of 1	ENSP00000368496.2	Q96L58
	SDF4	ENST00000900948.1		c.-174-3981C>A		intron	N/A	ENSP00000571007.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 7.08e-7 AC: 1 AN: 1412722 Hom.: 0 Cov.: 31 AF XY: 0.00 AC XY: 0 AN XY: 700508

African (AFR) AF: 0.00 AC: 0 AN: 31956

American (AMR) AF: 0.00 AC: 0 AN: 40686

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25316

East Asian (EAS) AF: 0.00 AC: 0 AN: 37462

South Asian (SAS) AF: 0.00 AC: 0 AN: 81818

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 36344

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 4356

European-Non Finnish (NFE) AF: 9.12e-7 AC: 1 AN: 1096194

Other (OTH) AF: 0.00 AC: 0 AN: 58590

GnomAD4 genome Cov.: 33

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.95
BayesDel_addAF	Pathogenic	0.25	D
BayesDel_noAF	Uncertain	0.12
CADD	Pathogenic	33
DANN	Uncertain	1.0
DEOGEN2	Benign	0.30	T
Eigen	Pathogenic	0.78
Eigen_PC	Pathogenic	0.68
FATHMM_MKL	Uncertain	0.93	D
LIST_S2	Uncertain	0.93	D
M_CAP	Pathogenic	0.96	D
MetaRNN	Pathogenic	0.98	D
MetaSVM	Uncertain	-0.26	T
MutationAssessor	Pathogenic	3.2	M
PhyloP100		6.7
PrimateAI	Pathogenic	0.92	D
PROVEAN	Pathogenic	-9.0	D
REVEL	Pathogenic	0.65
Sift	Pathogenic	0.0	D
Sift4G	Pathogenic	0.0	D
Polyphen		1.0	D
Vest4		0.79
MutPred		0.88		Gain of catalytic residue at S221 (P = 0.0852)
MVP		0.78
MPC		2.1
ClinPred		1.0	D
GERP RS		3.9
Varity_R		0.98
gMVP		0.92
Mutation Taster		=2/98	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: rs397514724; hg19: chr1-1168307; COSMIC: COSV99767856; COSMIC: COSV99767856;