chr5-149981550-T-A

Variant names:

• chr5-149981550-T-A
• rs104893924
• NM_000112.4:c.1957T>A

Variant summary

Our verdict is Pathogenic. Variant got 16 ACMG points: 16P and 0B. PM1 PM2 PP3_Strong PP5_Very_Strong

The NM_000112.4(SLC26A2):​c.1957T>A​(p.Cys653Ser) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000112 in 1,614,006 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★★).

• Frequency:
  • Genomes: 𝑓 0.00012 (0 hom., cov: 32)
  • Exomes 𝑓: 0.00011 (0 hom.)
• Consequence: SLC26A2 NM_000112.4 missense
• Clinical Significance: Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:23 O:1
• Conservation: PhyloP100: 7.94

Genes affected

SLC26A2 (HGNC:10994): (solute carrier family 26 member 2) The diastrophic dysplasia sulfate transporter is a transmembrane glycoprotein implicated in the pathogenesis of several human chondrodysplasias. It apparently is critical in cartilage for sulfation of proteoglycans and matrix organization. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Pathogenic. Variant got 16 ACMG points.

• PM1: In a domain STAS (size 151) in uniprot entity S26A2_HUMAN there are 4 pathogenic changes around while only 0 benign (100%) in NM_000112.4
• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.968
• PP5: Variant 5-149981550-T-A is Pathogenic according to our data. Variant chr5-149981550-T-A is described in ClinVar as [Likely_pathogenic]. Clinvar id is 4098.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr5-149981550-T-A is described in Lovd as [Likely_pathogenic]. Variant chr5-149981550-T-A is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SLC26A2	NM_000112.4	c.1957T>A	p.Cys653Ser	missense_variant	Exon 3 of 3	ENST00000286298.5	NP_000103.2
SLC26A2	XM_017009191.3	c.1957T>A	p.Cys653Ser	missense_variant	Exon 3 of 4		XP_016864680.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SLC26A2	ENST00000286298.5	c.1957T>A	p.Cys653Ser	missense_variant	Exon 3 of 3	1	NM_000112.4	ENSP00000286298.4
SLC26A2	ENST00000503336.1	c.372+3199T>A		intron_variant	Intron 1 of 1	3		ENSP00000426053.1

Frequencies

GnomAD3 genomes AF: 0.000125 AC: 19 AN: 152156 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000131

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: 0.000250

Gnomad OTH AF: 0.00

GnomAD3 exomes AF: 0.000111 AC: 28 AN: 251278 Hom.: 0 AF XY: 0.000133 AC XY: 18 AN XY: 135808

Gnomad AFR exome AF: 0.0000615

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.000238

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.000111 AC: 162 AN: 1461850 Hom.: 0 Cov.: 34 AF XY: 0.000132 AC XY: 96 AN XY: 727224

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.000142

Gnomad4 OTH exome AF: 0.0000662

GnomAD4 genome AF: 0.000125 AC: 19 AN: 152156 Hom.: 0 Cov.: 32 AF XY: 0.000135 AC XY: 10 AN XY: 74318

Gnomad4 AFR AF: 0.00

Gnomad4 AMR AF: 0.000131

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.000250

Gnomad4 OTH AF: 0.00

Alfa AF: 0.000164 Hom.: 0

Bravo AF: 0.0000831

ESP6500AA AF: 0.000227 AC: 1

ESP6500EA AF: 0.000116 AC: 1

ExAC AF: 0.0000988 AC: 12

EpiCase AF: 0.000218

EpiControl AF: 0.0000593

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:23 Other:1

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Pathogenic:7

Jul 01, 2023

CeGaT Center for Human Genetics Tuebingen

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

SLC26A2: PM3:Very Strong, PM2, PP4, PS3:Supporting -

Mar 22, 2019

Revvity Omics, Revvity

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Oct 02, 2014

Center for Pediatric Genomic Medicine, Children's Mercy Hospital and Clinics

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Jan 13, 2023

GeneDx

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

In silico analysis, which includes protein predictors and evolutionary conservation, supports a deleterious effect; Published functional studies revealed significantly reduced protein expression in cells with mutant protein, as compared to wild type cells (Karniski et al., 2004); This variant is associated with the following publications: (PMID: 12966518, 30578734, 35026467, 21077204, 20525296, 11241838, 21922596, 11448940, 29724173, 30423444, 29758562, 30462520, 28941661, 30080953, 31980526, 31589614, 33724725, 21155763, 34064542, 33728303, 32633442, 34958143, 34974531, 15294877, 12525546) -

Oct 14, 2014

Eurofins Ntd Llc (ga)

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Feb 05, 2021

ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The SLC26A2 c.1957T>A; p.Cys653Ser variant (rs104893924) is one of the most frequently found pathogenic SLC26A2 variants and has been described in the homozygous and compound heterozygous states in individuals with recessive multiple epiphyseal dysplasia (rMED) and diastrophic dysplasia (DTD; Czarny-Ratajczak 2010, Hinrichs 2010, Makitie 2003, Rossi 2001). It contains an entry in ClinVar (Variation ID: 4098) and is observed in the European (non-Finnish) population at an overall frequency of 0.027% (35/129008 alleles) in the Genome Aggregation Database. The cysteine at codon 653 is highly conserved and computational algorithms (PolyPhen-2, SIFT) predict that this variant is deleterious. In addition, functional in vitro studies of the variant protein demonstrate reduced protein expression and sulfate transport function when compared to wild type protein (Karniski 2004). Based on available information, this variant is considered pathogenic. REFERENCES Czarny-Ratajczak M et al. New intermediate phenotype between MED and DD caused by compound heterozygous mutations in the DTDST gene. Am J Med Genet A. 2010; 152A(12): 3036-3042. Hinrichs T et al. Recessive multiple epiphyseal dysplasia (rMED) with homozygosity for C653S mutation in the DTDST gene--phenotype, molecular diagnosis and surgical treatment of habitual dislocation of multilayered patella: case report. BMC Musculoskelet Disord. 2010;11:110. Karniski L. Functional expression and cellular distribution of diastrophic dysplasia sulfate transporter (DTDST) gene mutations in HEK cells. Hum Mol Genet. 2004; 13(19): 2165-2171. Makitie O et al. Autosomal recessive multiple epiphyseal dysplasia with homozygosity for C653S in the DTDST gene: double-layer patella as a reliable sign. Am J Med Genet A. 2003;122A(3): 187-192. Rossi A et al. Mutations in the diastrophic dysplasia sulfate transporter (DTDST) gene (SLC26A2): 22 novel mutations, mutation review, associated skeletal phenotypes, and diagnostic relevance. Hum Mutat. 2001; 17(3): 159-171. -

Nov 30, 2019

Blueprint Genetics

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Achondrogenesis, type IB Pathogenic:3

Sep 16, 2020

Natera, Inc.

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Mar 30, 2024

Baylor Genetics

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Dec 24, 2019

Myriad Genetics, Inc.

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

NM_000112.3(SLC26A2):c.1957T>A(C653S) is classified as likely pathogenic in the context of SLC26A2-related disorders and is associated with autosomal recessive multiple epiphyseal dysplasia. Sources cited for classification include the following: PMID 21922596, 20525296, 12966518, 21077204, 15294877, 11448940, 11241838, and 12525546. Classification of NM_000112.3(SLC26A2):c.1957T>A(C653S) is based on the following criteria: This variant has been observed more frequently in patients with clinical diagnoses than in healthy populations. Please note: this variant was assessed in the context of healthy population screening. -

Diastrophic dysplasia;C0265274:Achondrogenesis, type IB;C1847593:Multiple epiphyseal dysplasia type 4;C1850554:Atelosteogenesis type II Pathogenic:3

Jan 07, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces cysteine, which is neutral and slightly polar, with serine, which is neutral and polar, at codon 653 of the SLC26A2 protein (p.Cys653Ser). This variant is present in population databases (rs104893924, gnomAD 0.03%). This missense change has been observed in individuals with diastrophic dysplasia or epiphyseal dysplasia (PMID: 11241838, 12966518, 20525296, 21077204). It has also been observed to segregate with disease in related individuals. ClinVar contains an entry for this variant (Variation ID: 4098). Invitae Evidence Modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) indicates that this missense variant is expected to disrupt SLC26A2 protein function with a positive predictive value of 80%. Experimental studies have shown that this missense change affects SLC26A2 function (PMID: 15294877). For these reasons, this variant has been classified as Pathogenic. -

May 08, 2024

Fulgent Genetics, Fulgent Genetics

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Aug 13, 2016

Division of Human Genetics, Children's Hospital of Philadelphia

Significance: Likely pathogenic

Review Status: no assertion criteria provided

Collection Method: research

- -

Diastrophic dysplasia Pathogenic:2 Other:1

Dec 24, 2019

Myriad Genetics, Inc.

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

NM_000112.3(SLC26A2):c.1957T>A(C653S) is classified as likely pathogenic in the context of SLC26A2-related disorders and is associated with autosomal recessive multiple epiphyseal dysplasia. Sources cited for classification include the following: PMID 21922596, 20525296, 12966518, 21077204, 15294877, 11448940, 11241838, and 12525546. Classification of NM_000112.3(SLC26A2):c.1957T>A(C653S) is based on the following criteria: This variant has been observed more frequently in patients with clinical diagnoses than in healthy populations. Please note: this variant was assessed in the context of healthy population screening. -

Nov 09, 2020

Institute of Human Genetics, University of Leipzig Medical Center

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

-

GeneReviews

Significance: not provided

Review Status: no classification provided

Collection Method: literature only

- -

SLC26A2-related disorder Pathogenic:2

Mar 23, 2024

PreventionGenetics, part of Exact Sciences

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: clinical testing

The SLC26A2 c.1957T>A variant is predicted to result in the amino acid substitution p.Cys653Ser. This variant has been documented to be causative for SLC26A2-related disorders (Makitie et al. 2003. PubMed ID: 12966518; Hinrichs et al. 2010. PubMed ID: 20525296; Czarny-Ratajczak et al. 2010. PubMed ID: 21077204). This variant is reported in 0.027% of alleles in individuals of European (Non-Finnish) descent in gnomAD. This variant is interpreted as pathogenic. -

Jan 05, 2022

DASA

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.1957T>A;p.(Cys653Ser) missense variant has been observed in affected individual(s) and ClinVar contains an entry for this variant (Clinvar ID: 4098; PMID: 20301524; 11241838; 12966518; 20525296; 21077204; 21922596) - PS4. Well-established in vitro or in vivo functional studies support a damaging effect on the gene or gene product (PMID: 11448940; 15294877) - PS3_moderate. The variant is present at low allele frequencies population databases (rs104893924– gnomAD 0.001249%; ABraOM no frequency - http://abraom.ib.usp.br/) - PM2_supporting. The p.(Cys653Ser) was detected in trans with a pathogenic variant (PMID: 12966518; 20525296; 21077204; 21922596) - PM3_strong. The variant co-segregated with disease in multiple affected family members (PMID: 21077204) - PP1. In summary, the currently available evidence indicates that the variant is pathogenic. -

Multiple epiphyseal dysplasia type 4 Pathogenic:2

Oct 15, 2003

OMIM

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: literature only

- -

Dec 24, 2019

Myriad Genetics, Inc.

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

NM_000112.3(SLC26A2):c.1957T>A(C653S) is classified as likely pathogenic in the context of SLC26A2-related disorders and is associated with autosomal recessive multiple epiphyseal dysplasia. Sources cited for classification include the following: PMID 21922596, 20525296, 12966518, 21077204, 15294877, 11448940, 11241838, and 12525546. Classification of NM_000112.3(SLC26A2):c.1957T>A(C653S) is based on the following criteria: This variant has been observed more frequently in patients with clinical diagnoses than in healthy populations. Please note: this variant was assessed in the context of healthy population screening. -

Atelosteogenesis type II Pathogenic:1

Mar 11, 2016

Counsyl

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Sulfate transporter-related osteochondrodysplasia Pathogenic:1

Jun 07, 2018

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Variant summary: SLC26A2 c.1957T>A (p.Cys653Ser) results in a non-conservative amino acid change located in the STAS domain of the encoded protein sequence. Five of five in-silico tools predict a damaging effect of the variant on protein function. The variant allele was found at a frequency of 0.00013 in 276994 control chromosomes (gnomAD). The variant, c.1957T>A, has been reported in the literature in multiple homozygote and compound heterozygote individuals affected with recessive Multiple epiphyseal dysplasia (Ballhausen_2003, Jackson_2012). These data indicate that the variant is very likely to be associated with disease. A functional study, Karniski_2004, found the variant to have ~55% stimulated sulfate transport. Two ClinVar submissions from clinical diagnostic laboratories (evaluation after 2014) cite the variant as likely pathogenic. Based on the evidence outlined above, the variant was classified as pathogenic. -

3MC syndrome 2 Pathogenic:1

Dec 24, 2019

Myriad Genetics, Inc.

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

NM_000112.3(SLC26A2):c.1957T>A(C653S) is classified as likely pathogenic in the context of SLC26A2-related disorders and is associated with autosomal recessive multiple epiphyseal dysplasia. Sources cited for classification include the following: PMID 21922596, 20525296, 12966518, 21077204, 15294877, 11448940, 11241838, and 12525546. Classification of NM_000112.3(SLC26A2):c.1957T>A(C653S) is based on the following criteria: This variant has been observed more frequently in patients with clinical diagnoses than in healthy populations. Please note: this variant was assessed in the context of healthy population screening. -

Connective tissue disorder Pathogenic:1

Mar 01, 2020

Genome Diagnostics Laboratory, The Hospital for Sick Children

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.74
BayesDel_addAF	Pathogenic	0.19	D
BayesDel_noAF	Pathogenic	0.38
CADD	Pathogenic	26
DANN	Uncertain	0.99
DEOGEN2	Uncertain	0.78	D
Eigen	Pathogenic	0.83
Eigen_PC	Pathogenic	0.76
FATHMM_MKL	Pathogenic	1.0	D
LIST_S2	Uncertain	0.89	D
M_CAP	Uncertain	0.16	D
MetaRNN	Pathogenic	0.97	D
MetaSVM	Pathogenic	0.87	D
MutationAssessor	Pathogenic	3.3	M
PrimateAI	Uncertain	0.60	T
PROVEAN	Pathogenic	-7.4	D
REVEL	Pathogenic	0.86
Sift	Uncertain	0.0080	D
Sift4G	Uncertain	0.0030	D
Polyphen		1.0	D
Vest4		0.92
MutPred		0.91		Loss of catalytic residue at I651 (P = 0.1057);
MVP		1.0
MPC		0.35
ClinPred		0.90	D
GERP RS		6.0
Varity_R		0.94
gMVP		0.85

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

Other links and lift over

dbSNP: rs104893924; hg19: chr5-149361113;