Genetic Variant NM_012200.4:c.821C>T (chr11-62616594-G-A) – ACMG Classification: Uncertain_significance (1 pts)

Variant summary

Our verdict is Uncertain significance. The variant received 1 ACMG points: 3P and 2B. PM2PP2BP4_Moderate

The NM_012200.4(B3GAT3):c.821C>T(p.Thr274Ile) 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 1,461,894 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 15/22 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. T274N) has been classified as Benign.

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 6.8e-7 ( 0 hom. )

Consequence

B3GAT3
NM_012200.4 missense

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 1.32

Publications

0 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:

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ACMG classification

Classification was made for transcript

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 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=0.14482462).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
B3GAT3	NM_012200.4 link	c.821C>T	p.Thr274Ile	missense_variant	Exon 4 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.821C>T	p.Thr274Ile	missense_variant	Exon 4 of 5	1	NM_012200.4	ENSP00000265471.5		O94766-1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

6.84e-7

AC:

AN:

1461894

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

727248

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33480

American (AMR)

AF:

0.00

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:

86258

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53420

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5768

European-Non Finnish (NFE)

AF:

8.99e-7

AC:

AN:

1112012

Other (OTH)

AF:

0.00

AC:

AN:

60396

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.475

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome 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

GnomAD4 genome

Cov.:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.20

BayesDel_addAF

Benign

-0.12

BayesDel_noAF

Benign

-0.41

CADD

Benign

(source)

DANN

Uncertain

0.99

DEOGEN2

Benign

0.14

T;.;.

Eigen

Benign

-0.39

Eigen_PC

Benign

-0.37

FATHMM_MKL

Benign

0.16

LIST_S2

Uncertain

0.91

D;D;D

M_CAP

Benign

0.031

MetaRNN

Benign

0.14

T;T;T

MetaSVM

Benign

-0.89

MutationAssessor

Uncertain

2.2

M;.;M

PhyloP100

1.3

PrimateAI

Benign

0.41

PROVEAN

Benign

-2.0

N;N;N

REVEL

Benign

0.048

Sift

Benign

0.084

T;T;T

Sift4G

Benign

0.14

T;T;T

Polyphen

0.0010

B;.;.

Vest4

0.26

MutPred

0.42

Gain of catalytic residue at P276 (P = 0.0305);Gain of catalytic residue at P276 (P = 0.0305);Gain of catalytic residue at P276 (P = 0.0305);

MVP

0.68

MPC

0.34

ClinPred

0.12

GERP RS

3.4

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.0

Varity_R

0.17

gMVP

0.42

Mutation Taster

=94/6

polymorphism

(source)

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

Publications

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over