Genetic Variant NM_175856.5:c.242A>G (chr5-129905071-A-G) – ACMG Classification: Likely_benign (-4 pts)

Variant summary

Our verdict is Likely benign. The variant received -4 ACMG points: 0P and 4B. BP4_Strong

The NM_175856.5(CHSY3):c.242A>G(p.Gln81Arg) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000447 in 1,544,714 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. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.00022 ( 0 hom., cov: 33)

Exomes 𝑓: 0.000026 ( 0 hom. )

Consequence

CHSY3
NM_175856.5 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: -0.803

Publications

0 publications found

Variant links:

Genes affected

CHSY3 (HGNC:24293): (chondroitin sulfate synthase 3) CSS3 is a glycosyltransferase that has both glucuronyltransferase and N-acetylgalactosaminyltransferase activities (Yada et al., 2003 [PubMed 12907687]).[supplied by OMIM, Mar 2008]

CHSY3 links:

ENSG00000251680 (HGNC:58253):

ENSG00000251680 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -4 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.005265981).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CHSY3	NM_175856.5 link	c.242A>G	p.Gln81Arg	missense_variant	Exon 1 of 3	ENST00000305031.5	NP_787052.3	Q70JA7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CHSY3	ENST00000305031.5 link	c.242A>G	p.Gln81Arg	missense_variant	Exon 1 of 3	1	NM_175856.5	ENSP00000302629.4		Q70JA7

Frequencies

GnomAD3 genomes

AF:

0.000217

AC:

AN:

152042

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000797

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:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.0000499

AC:

AN:

140264

AF XY:

0.0000516

show subpopulations

Gnomad AFR exome

AF:

0.00106

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000259

AC:

AN:

1392558

Hom.:

Cov.:

AF XY:

0.0000247

AC XY:

AN XY:

688360

show subpopulations

African (AFR)

AF:

0.00108

AC:

AN:

31558

American (AMR)

AF:

0.00

AC:

AN:

37966

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

25214

East Asian (EAS)

AF:

0.00

AC:

AN:

36190

South Asian (SAS)

AF:

0.00

AC:

AN:

79550

European-Finnish (FIN)

AF:

0.00

AC:

AN:

34848

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5538

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

1083598

Other (OTH)

AF:

0.0000344

AC:

AN:

58096

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.479

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

AF:

0.000217

AC:

AN:

152156

Hom.:

Cov.:

AF XY:

0.000188

AC XY:

AN XY:

74376

show subpopulations

African (AFR)

AF:

0.000794

AC:

AN:

41552

American (AMR)

AF:

0.00

AC:

AN:

15296

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3466

East Asian (EAS)

AF:

0.00

AC:

AN:

5134

South Asian (SAS)

AF:

0.00

AC:

AN:

4818

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10614

Middle Eastern (MID)

AF:

0.00

AC:

AN:

292

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

67960

Other (OTH)

AF:

0.00

AC:

AN:

2112

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

Alfa

AF:

0.000142

Hom.:

Bravo

AF:

0.000234

ExAC

AF:

0.0000285

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Aug 13, 2021

Ambry Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The c.242A>G (p.Q81R) alteration is located in exon 1 (coding exon 1) of the CHSY3 gene. This alteration results from a A to G substitution at nucleotide position 242, causing the glutamine (Q) at amino acid position 81 to be replaced by an arginine (R). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.071

BayesDel_addAF

Benign

-0.59

BayesDel_noAF

Benign

-0.70

CADD

Benign

1.2

(source)

DANN

Benign

0.60

DEOGEN2

Benign

0.010

Eigen

Benign

-1.2

Eigen_PC

Benign

-1.2

FATHMM_MKL

Benign

0.10

LIST_S2

Benign

0.39

M_CAP

Benign

0.068

MetaRNN

Benign

0.0053

MetaSVM

Benign

-1.1

MutationAssessor

Benign

0.34

PhyloP100

-0.80

PrimateAI

Uncertain

0.79

PROVEAN

Benign

-0.040

REVEL

Benign

0.024

Sift

Benign

0.82

Sift4G

Benign

0.51

Polyphen

0.0

Vest4

0.057

MutPred

0.13

Gain of helix (P = 0.1736);

MVP

0.22

MPC

1.2

ClinPred

0.020

GERP RS

-3.1

Varity_R

0.034

gMVP

0.51

Mutation Taster

=92/8

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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NM_175856.5:c.242A>G

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