rs369029338

chr11-44130088-A-G

Variant summary

Our verdict is Benign. Variant got -13 ACMG points: 0P and 13B. BP4_Strong BP6 BS1 BS2

The NM_207122.2(EXT2):c.1123A>G(p.Ser375Gly) variant causes a missense change. The variant allele was found at a frequency of 0.000385 in 1,614,242 control chromosomes in the GnomAD database, including 3 homozygotes. In-silico tool predicts a benign outcome for this variant. 12/20 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. S375N) has been classified as Uncertain significance.

• Frequency:
  • Genomes: 𝑓 0.00029 (0 hom., cov: 32)
  • Exomes 𝑓: 0.00040 (3 hom.)
• Consequence: EXT2 NM_207122.2 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:1 B:2 O:1
• Conservation: PhyloP100: 5.14

Genes affected

EXT2 (HGNC:3513): (exostosin glycosyltransferase 2) This gene encodes one of two glycosyltransferases involved in the chain elongation step of heparan sulfate biosynthesis. Mutations in this gene cause the type II form of multiple exostoses. Alternatively spliced transcript variants encoding different isoforms have been noted for this gene. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Benign. Variant got -13 ACMG points.

• BP4: Computational evidence support a benign effect (MetaRNN=0.010539144).
• BP6: Variant 11-44130088-A-G is Benign according to our data. Variant chr11-44130088-A-G is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 134216.We mark this variant Likely_benign, oryginal submissions are: {Benign=2, not_provided=1, Uncertain_significance=1}.
• BS1: Variant frequency is greater than expected in population sas. gnomad4 allele frequency = 0.000289 (44/152360) while in subpopulation SAS AF= 0.00827 (40/4834). AF 95% confidence interval is 0.00625. There are 0 homozygotes in gnomad4. There are 31 alleles in male gnomad4 subpopulation. This position pass quality control queck.
• BS2: High AC in GnomAd at 44 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
EXT2	NM_207122.2	c.1123A>G	p.Ser375Gly	missense_variant	7/14	ENST00000533608.7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
EXT2	ENST00000533608.7	c.1123A>G	p.Ser375Gly	missense_variant	7/14	1	NM_207122.2	P1

Frequencies

GnomAD3 genomes AF: 0.000289 AC: 44 AN: 152242 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: 0.00827

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000294

Gnomad OTH AF: 0.000955

GnomAD3 exomes AF: 0.000859 AC: 216 AN: 251456 Hom.: 2 AF XY: 0.00109 AC XY: 148 AN XY: 135898

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.0000289

Gnomad ASJ exome AF: 0.0000992

Gnomad EAS exome AF: 0.0000544

Gnomad SAS exome AF: 0.00679

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000176

Gnomad OTH exome AF: 0.000489

GnomAD4 exome AF: 0.000395 AC: 578 AN: 1461882 Hom.: 3 Cov.: 31 AF XY: 0.000561 AC XY: 408 AN XY: 727244

Gnomad4 AFR exome AF: 0.0000299

Gnomad4 AMR exome AF: 0.0000224

Gnomad4 ASJ exome AF: 0.0000383

Gnomad4 EAS exome AF: 0.0000504

Gnomad4 SAS exome AF: 0.00621

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.0000117

Gnomad4 OTH exome AF: 0.000397

GnomAD4 genome AF: 0.000289 AC: 44 AN: 152360 Hom.: 0 Cov.: 32 AF XY: 0.000416 AC XY: 31 AN XY: 74502

Gnomad4 AFR AF: 0.00

Gnomad4 AMR AF: 0.00

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00827

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.0000294

Gnomad4 OTH AF: 0.000945

Alfa AF: 0.0000427 Hom.: 0

Bravo AF: 0.0000642

ESP6500AA AF: 0.00 AC: 0

ESP6500EA AF: 0.000116 AC: 1

ExAC AF: 0.00105 AC: 127

Asia WGS AF: 0.00404 AC: 14 AN: 3478

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:1 Benign:2 Other:1

Revision: criteria provided, conflicting classifications

Submissions by phenotype

Exostoses, multiple, type 2 Benign:2

Benign, criteria provided, single submitter	clinical testing	Illumina Laboratory Services, Illumina	Jan 13, 2018	This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease. -
Benign, criteria provided, single submitter	clinical testing	Invitae	Jan 29, 2024	- -

not provided Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Eurofins Ntd Llc (ga)

Jul 17, 2014

- -

not specified Other:1

not provided, no classification provided

reference population

ITMI

Sep 19, 2013

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.057
BayesDel_addAF	Benign	-0.23	T
BayesDel_noAF	Benign	-0.10
Cadd	Benign	18
Dann	Uncertain	0.99
DEOGEN2	Pathogenic	0.81	D;.;.;D
Eigen	Benign	-0.025
Eigen_PC	Benign	0.17
FATHMM_MKL	Pathogenic	0.98	D
MetaRNN	Benign	0.011	T;T;T;T
MetaSVM	Uncertain	0.66	D
MutationAssessor	Benign	1.4	L;L;.;L
MutationTaster	Benign	1.0	D;D;D;D
PrimateAI	Benign	0.32	T
PROVEAN	Benign	-2.2	N;N;N;N
REVEL	Uncertain	0.39
Sift	Benign	0.089	T;T;D;T
Sift4G	Benign	0.34	T;T;T;T
Polyphen		0.0010	B;B;.;B
Vest4		0.13
MVP		0.99
MPC		0.20
ClinPred		0.045	T
GERP RS		5.7
Varity_R		0.14
gMVP		0.42

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.060		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Other links and lift over

dbSNP: rs369029338; hg19: chr11-44151638;