rs777739643

Positions:

chr10-72008062-A-G

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM2

The NM_004273.5(CHST3):c.1031A>G(p.Asn344Ser) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000646 in 1,548,816 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.0000066 ( 0 hom., cov: 33)

Exomes 𝑓: 0.0000064 ( 0 hom. )

Consequence

CHST3
NM_004273.5 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 7.22

Variant links:

Genes affected

CHST3 (HGNC:1971): (carbohydrate sulfotransferase 3) This gene encodes an enzyme which catalyzes the sulfation of chondroitin, a proteoglycan found in the extracellular matrix and most cells which is involved in cell migration and differentiation. Mutations in this gene are associated with spondylepiphyseal dysplasia and humerospinal dysostosis. [provided by RefSeq, Mar 2009]

CHST3 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein
CHST3	NM_004273.5 linkuse as main transcript	c.1031A>G	p.Asn344Ser	missense_variant	3/3	ENST00000373115.5	NP_004264.2
CHST3	XM_006718075.5 linkuse as main transcript	c.1031A>G	p.Asn344Ser	missense_variant	3/3		XP_006718138.1
CHST3	XM_011540369.3 linkuse as main transcript	c.1031A>G	p.Asn344Ser	missense_variant	3/3		XP_011538671.1
CHST3	XM_047426022.1 linkuse as main transcript	c.1031A>G	p.Asn344Ser	missense_variant	3/3		XP_047281978.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
CHST3	ENST00000373115.5 linkuse as main transcript	c.1031A>G	p.Asn344Ser	missense_variant	3/3	1	NM_004273.5	ENSP00000362207	P1

Frequencies

GnomAD3 genomes

AF:

0.00000657

AC:

AN:

152160

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:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00316

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000135

AC:

AN:

148210

Hom.:

AF XY:

0.00

AC XY:

AN XY:

79518

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000408

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.0000443

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000644

AC:

AN:

1396656

Hom.:

Cov.:

AF XY:

0.00000726

AC XY:

AN XY:

688812

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.0000280

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000379

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00000371

Gnomad4 OTH exome

AF:

0.0000173

GnomAD4 genome

AF:

0.00000657

AC:

AN:

152160

Hom.:

Cov.:

AF XY:

0.0000135

AC XY:

AN XY:

74322

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.000142

Hom.:

Bravo

AF:

0.00000378

ExAC

AF:

0.0000217

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

Spondyloepiphyseal dysplasia with congenital joint dislocations

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Feb 21, 2020

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. Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant may create or strengthen a splice site, but this prediction has not been confirmed by published transcriptional studies. Algorithms developed to predict the effect of missense changes on protein structure and function do not agree on the potential impact of this missense change (SIFT: "Tolerated"; PolyPhen-2: "Possibly Damaging"; Align-GVGD: "Class C0"). This variant has not been reported in the literature in individuals with CHST3-related disease. While this variant is present in population databases (rs777739643), the frequency information is unreliable, as metrics indicate poor data quality at this position in the ExAC database. This sequence change replaces asparagine with serine at codon 344 of the CHST3 protein (p.Asn344Ser). The asparagine residue is highly conserved and there is a small physicochemical difference between asparagine and serine. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.16

BayesDel_addAF

Benign

-0.087

BayesDel_noAF

Benign

-0.24

CADD

Uncertain

DANN

Uncertain

0.98

DEOGEN2

Benign

0.20

Eigen

Pathogenic

0.73

Eigen_PC

Pathogenic

0.72

FATHMM_MKL

Pathogenic

0.99

LIST_S2

Uncertain

0.86

M_CAP

Benign

0.047

MetaRNN

Uncertain

0.67

MetaSVM

Uncertain

0.30

MutationAssessor

Uncertain

2.5

MutationTaster

Benign

1.0

PrimateAI

Uncertain

0.61

PROVEAN

Benign

-0.65

REVEL

Uncertain

0.51

Sift

Benign

0.17

Sift4G

Benign

0.10

Polyphen

1.0

Vest4

0.58

MutPred

0.68

Loss of catalytic residue at N344 (P = 0.0057);

MVP

0.92

MPC

1.1

ClinPred

0.46

GERP RS

5.5

Varity_R

0.27

gMVP

0.89

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

LitVar

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over