rs140755387

Variant names:

Variant summary

Our verdict is Benign. The variant received -8 ACMG points: 1P and 9B. PP2BP4_StrongBS1_SupportingBS2

The NM_012200.4(B3GAT3):c.554G>A(p.Gly185Glu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00147 in 1,614,058 control chromosomes in the GnomAD database, including 8 homozygotes. In-silico tool predicts a benign outcome for this variant. 16/22 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).

Frequency

Genomes: 𝑓 0.00090 ( 0 hom., cov: 32)

Exomes 𝑓: 0.0015 ( 8 hom. )

Consequence

B3GAT3
NM_012200.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:6

Conservation

PhyloP100: 2.53

Publications

3 publications found

Variant links:

Genes affected

B3GAT3 (HGNC:923): (beta-1,3-glucuronyltransferase 3) The protein encoded by this gene is a member of the glucuronyltransferase gene family, enzymes that exhibit strict acceptor specificity, recognizing nonreducing terminal sugars and their anomeric linkages. This gene product catalyzes the formation of the glycosaminoglycan-protein linkage by way of a glucuronyl transfer reaction in the final step of the biosynthesis of the linkage region of proteoglycans. A pseudogene of this gene has been identified on chromosome 3. [provided by RefSeq, Dec 2013]

B3GAT3 Gene-Disease associations (from GenCC):

Larsen-like syndrome, B3GAT3 type
Inheritance: AR Classification: STRONG, MODERATE, SUPPORTIVE, LIMITED Submitted by: G2P, Ambry Genetics, Labcorp Genetics (formerly Invitae), Orphanet, PanelApp Australia
complex neurodevelopmental disorder
Inheritance: AD Classification: LIMITED Submitted by: Ambry Genetics

B3GAT3 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -8 ACMG points.

PP2

Missense variant in the gene, where a lot of missense mutations are associated with disease in ClinVar. The gene has 8 curated pathogenic missense variants (we use a threshold of 10). The gene has 2 curated benign missense variants. Gene score misZ: 0.69161 (below the threshold of 3.09). Trascript score misZ: 1.8273 (below the threshold of 3.09). GenCC associations: The gene is linked to Larsen-like syndrome, B3GAT3 type, complex neurodevelopmental disorder.

BP4

Computational evidence support a benign effect (MetaRNN=0.02634731).

BS1

Variant frequency is greater than expected in population nfe. GnomAd4 allele frequency = 0.0009 (137/152174) while in subpopulation NFE AF = 0.00168 (114/68036). AF 95% confidence interval is 0.00143. There are 0 homozygotes in GnomAd4. There are 64 alleles in the male GnomAd4 subpopulation. Median coverage is 32. This position passed quality control check. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting

BS2

High Homozygotes in GnomAdExome4 at 8 AR,AD gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
B3GAT3	NM_012200.4 link	c.554G>A	p.Gly185Glu	missense_variant	Exon 3 of 5	ENST00000265471.10	NP_036332.2	O94766-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
B3GAT3	ENST00000265471.10 link	c.554G>A	p.Gly185Glu	missense_variant	Exon 3 of 5	1	NM_012200.4	ENSP00000265471.5		O94766-1

Frequencies

GnomAD3 genomes

AF:

0.000900

AC:

137

AN:

152174

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000241

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:

0.00104

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00168

Gnomad OTH

AF:

0.000957

GnomAD2 exomes

AF:

0.000652

AC:

164

AN:

251486

AF XY:

0.000574

show subpopulations

Gnomad AFR exome

AF:

0.000185

Gnomad AMR exome

AF:

0.0000289

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00176

Gnomad NFE exome

AF:

0.00105

Gnomad OTH exome

AF:

0.000489

GnomAD4 exome

AF:

0.00153

AC:

2238

AN:

1461884

Hom.:

Cov.:

AF XY:

0.00144

AC XY:

1048

AN XY:

727242

show subpopulations

African (AFR)

AF:

0.0000896

AC:

AN:

33480

American (AMR)

AF:

0.0000447

AC:

AN:

44724

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26136

East Asian (EAS)

AF:

0.00

AC:

AN:

39700

South Asian (SAS)

AF:

0.00

AC:

AN:

86256

European-Finnish (FIN)

AF:

0.00139

AC:

AN:

53418

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5762

European-Non Finnish (NFE)

AF:

0.00176

AC:

1956

AN:

1112012

Other (OTH)

AF:

0.00336

AC:

203

AN:

60396

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.491

Heterozygous variant carriers

151

301

452

602

753

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

156

234

312

390

<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

AF:

0.000900

AC:

137

AN:

152174

Hom.:

Cov.:

AF XY:

0.000861

AC XY:

AN XY:

74340

show subpopulations

African (AFR)

AF:

0.000241

AC:

AN:

41432

American (AMR)

AF:

0.00

AC:

AN:

15274

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3470

East Asian (EAS)

AF:

0.00

AC:

AN:

5196

South Asian (SAS)

AF:

0.00

AC:

AN:

4830

European-Finnish (FIN)

AF:

0.00104

AC:

AN:

10618

Middle Eastern (MID)

AF:

0.00

AC:

AN:

316

European-Non Finnish (NFE)

AF:

0.00168

AC:

114

AN:

68036

Other (OTH)

AF:

0.000957

AC:

AN:

2090

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.501

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome 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

Alfa

AF:

0.000997

Hom.:

Bravo

AF:

0.000744

TwinsUK

AF:

0.00108

AC:

ALSPAC

AF:

0.00104

AC:

ESP6500AA

AF:

0.000227

AC:

ESP6500EA

AF:

0.00163

AC:

ExAC

AF:

0.000634

AC:

EpiCase

AF:

0.00142

EpiControl

AF:

0.00113

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:6

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Larsen-like syndrome, B3GAT3 type

Uncertain:3

Oct 17, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This sequence change replaces glycine, which is neutral and non-polar, with glutamic acid, which is acidic and polar, at codon 185 of the B3GAT3 protein (p.Gly185Glu). This variant is present in population databases (rs140755387, gnomAD 0.2%), and has an allele count higher than expected for a pathogenic variant. This variant has not been reported in the literature in individuals affected with B3GAT3-related conditions. ClinVar contains an entry for this variant (Variation ID: 548015). Algorithms developed to predict the effect of missense changes on protein structure and function (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be tolerated. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

Apr 03, 2024

Fulgent Genetics, Fulgent Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Dec 11, 2017

Mayo Clinic Laboratories, Mayo Clinic

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

not specified

Uncertain:1

Jun 04, 2025

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Variant summary: B3GAT3 c.554G>A (p.Gly185Glu) results in a non-conservative amino acid change in the encoded protein sequence. Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change. The variant allele was found at a frequency of 0.0015 in 1614058 control chromosomes in the gnomAD database, including 8 homozygotes. c.554G>A has been reported in the literature in at least one heterozygous individual affected with hypermobility (e.g., Rashed_2022). However, these report(s) do not provide unequivocal conclusions about association of the variant with Larsen-Like Syndrome, B3GAT3 Type. To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. The following publication has been ascertained in the context of this evaluation (PMID: 35000503). ClinVar contains an entry for this variant (Variation ID: 548015). Based on the evidence outlined above, the variant was classified as VUS-possibly benign. -

Inborn genetic diseases

Uncertain:1

Jul 14, 2021

Ambry Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The c.554G>A (p.G185E) alteration is located in exon 3 (coding exon 3) of the B3GAT3 gene. This alteration results from a G to A substitution at nucleotide position 554, causing the glycine (G) at amino acid position 185 to be replaced by a glutamic acid (E). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

not provided

Uncertain:1

Dec 04, 2024

GeneDx

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Has been reported as a variant of uncertain significance in an individual with hEDS who also harbored a COL1A1 variant of uncertain significance (PMID: 35000503); In silico analysis indicates that this missense variant does not alter protein structure/function; This variant is associated with the following publications: (PMID: 35000503) -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.11

BayesDel_addAF

Benign

-0.44

BayesDel_noAF

Benign

-0.43

CADD

Benign

(source)

DANN

Benign

0.97

DEOGEN2

Benign

0.078

T;.;.;T

Eigen

Benign

-0.28

Eigen_PC

Benign

-0.11

FATHMM_MKL

Benign

0.59

LIST_S2

Benign

0.80

T;T;T;T

M_CAP

Benign

0.0091

MetaRNN

Benign

0.026

T;T;T;T

MetaSVM

Benign

-1.0

MutationAssessor

Benign

0.81

L;.;L;.

PhyloP100

2.5

PrimateAI

Uncertain

0.63

PROVEAN

Benign

-0.77

N;N;N;N

REVEL

Benign

0.049

Sift

Benign

0.43

T;T;T;T

Sift4G

Benign

0.17

T;T;T;T

Polyphen

0.028

B;.;.;.

Vest4

0.55

MVP

0.79

MPC

0.40

ClinPred

0.0099

GERP RS

5.5

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Varity_R

0.087

gMVP

0.68

Mutation Taster

=79/21

polymorphism

(source)

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over