Genetic Variant EXT2:c.-26G>T (chr11-44107687-G-T) – ACMG Classification: Likely_benign (-2 pts)

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 0P and 2B. BP4_Moderate

The NM_207122.2(EXT2):c.-26G>T variant causes a 5 prime UTR premature start codon gain change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000112 in 1,608,230 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).

Frequency

Genomes: 𝑓 0.000020 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000010 ( 0 hom. )

Consequence

EXT2
NM_207122.2 5_prime_UTR_premature_start_codon_gain

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:3

Conservation

PhyloP100: 1.87

Publications

2 publications found

Variant links:

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]

EXT2 Gene-Disease associations (from GenCC):

exostoses, multiple, type 2
Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), G2P, Genomics England PanelApp, ClinGen, Ambry Genetics
seizures-scoliosis-macrocephaly syndrome
Inheritance: AR Classification: STRONG, SUPPORTIVE, LIMITED Submitted by: Orphanet, Ambry Genetics, Labcorp Genetics (formerly Invitae)
hereditary multiple osteochondromas
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

EXT2 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -2 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.121367395).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_207122.2. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Gene	Transcript	Tags	HGVSc	Effect	Exon Rank	Protein	UniProt
EXT2	NM_207122.2	MANE Select	c.-26G>T	5_prime_UTR_premature_start_codon_gain	Exon 2 of 14	NP_997005.1	Q93063-1
EXT2	NM_207122.2	MANE Select	c.-26G>T	5_prime_UTR	Exon 2 of 14	NP_997005.1	Q93063-1
EXT2	NM_001178083.3		c.-26G>T	5_prime_UTR_premature_start_codon_gain	Exon 2 of 15	NP_001171554.1	Q93063-2

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	Effect	Exon Rank	Protein	UniProt
EXT2	ENST00000533608.7	TSL:1 MANE Select	c.-26G>T	5_prime_UTR_premature_start_codon_gain	Exon 2 of 14	ENSP00000431173.2	Q93063-1
EXT2	ENST00000358681.8	TSL:1	c.-26G>T	5_prime_UTR_premature_start_codon_gain	Exon 2 of 15	ENSP00000351509.4	Q93063-2
EXT2	ENST00000343631.4	TSL:1	c.-26G>T	5_prime_UTR_premature_start_codon_gain	Exon 3 of 15	ENSP00000342656.3	Q93063-1

Frequencies

GnomAD3 genomes

AF:

0.0000197

AC:

AN:

152226

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.000577

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

GnomAD2 exomes

AF:

0.00000798

AC:

AN:

250474

AF XY:

0.0000148

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000290

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.0000544

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000103

AC:

AN:

1456004

Hom.:

Cov.:

AF XY:

0.00000830

AC XY:

AN XY:

722942

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33366

American (AMR)

AF:

0.0000224

AC:

AN:

44618

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26054

East Asian (EAS)

AF:

0.0000506

AC:

AN:

39540

South Asian (SAS)

AF:

0.0000116

AC:

AN:

86064

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53304

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5750

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

1107170

Other (OTH)

AF:

0.000183

AC:

AN:

60138

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.482

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

AF:

0.0000197

AC:

AN:

152226

Hom.:

Cov.:

AF XY:

0.0000269

AC XY:

AN XY:

74358

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

41462

American (AMR)

AF:

0.00

AC:

AN:

15290

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3466

East Asian (EAS)

AF:

0.000577

AC:

AN:

5202

South Asian (SAS)

AF:

0.00

AC:

AN:

4832

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10620

Middle Eastern (MID)

AF:

0.00

AC:

AN:

316

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

68032

Other (OTH)

AF:

0.00

AC:

AN:

2094

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.525

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:

0.00

Hom.:

Bravo

AF:

0.0000151

ExAC

AF:

0.00000824

AC:

Asia WGS

AF:

0.000577

AC:

AN:

3478

ClinVar

ClinVar submissions

Significance:Uncertain significance

Revision:criteria provided, multiple submitters, no conflicts

View on ClinVar

Pathogenic

VUS

Benign

Condition

Exostoses, multiple, type 2 (2)

EXT2-related disorder (1)

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.085

BayesDel_addAF

Benign

-0.074

BayesDel_noAF

Benign

-0.17

CADD

Benign

(source)

DANN

Uncertain

0.99

Eigen

Benign

-0.18

Eigen_PC

Benign

0.012

FATHMM_MKL

Benign

0.46

LIST_S2

Benign

0.44

M_CAP

Benign

0.040

MetaRNN

Benign

0.12

MetaSVM

Uncertain

-0.082

PhyloP100

1.9

PrimateAI

Benign

0.31

PROVEAN

Benign

0.080

REVEL

Benign

0.26

Sift

Pathogenic

0.0

Sift4G

Pathogenic

0.0

Vest4

0.29

MutPred

0.40

Gain of sheet (P = 0.1208)

MVP

0.87

MPC

0.64

ClinPred

0.39

GERP RS

5.3

gMVP

0.36

Mutation Taster

=91/9

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.050

Details are displayed if max score is > 0.2

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

Publications

You must be logged in to view publications. This limit was set because tens of millions (!) of queries from AI bots are generated daily.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over