7-107690236-A-G

Variant names:

• chr7-107690236-A-G
• rs201660407
• NM_000441.2:c.1262A>G

Variant summary

Our verdict is Uncertain significance. The variant received 5 ACMG points: 5P and 0B. PM5 PP3 PP4 PM2_Supporting

This summary comes from the ClinGen Evidence Repository: The c.1262A>G variant in SLC26A4 is a missense variant predicted to cause substitution of glutamine by arginine at amino acid 421 (p.Gln421Arg). The highest population minor allele frequency in gnomAD v2.1.1 is 0.003% (3/113084) in the European (non-Finnish) population, which is lower than the ClinGen Hearing Loss VCEP threshold (<0.007%) for PM2_Supporting, meeting this criterion (PM2_Supporting). The computational predictor REVEL gives a score of 0.954, which is above the threshold of 0.7, evidence that correlates with impact to SLC26A4 function (PP3). Another missense variant, c.1262A>C (p.Gln421Pro), at the same codon has been classified as likely pathogenic for autosomal recessive Pendred syndrome (PM5; PMID:17718863, 23918157, 24224479, 28964290). The p.Gln421Arg variant has been reported in five individuals with hearing loss and inner ear abnormalities, which is highly specific for Pendred syndrome (PP4). Two individuals did not have a variant on the second allele identified (PMIDs: 23965030, 14679580). Two individuals were compound heterozygous for the CEVA haplotype, and one individual was compound heterozygous for a variant of uncertain significance, c.284G>A p.Gly95Glu. Phase for these individuals was unknown (0 PM3 points, PMID:36833263). This variant was re-reviewed on 6.27.2023, and PM2 was downgraded to PM2_Supporting following the most recent specification criteria. Because no contradictory evidence was added, this variant was retained at likely pathogenic for autosomal recessive Pendrome syndrome based on the ACMG/AMP criteria applied, as specified by the ClinGen Hearing Loss VCEP: PM5, PM2_Supporting, PP3, PP4. (VCEP specifications version 2; 06.21.2023). LINK:https://erepo.genome.network/evrepo/ui/classification/CA4432734/MONDO:0010134/005

• Frequency:
  • Genomes: 𝑓 0.000020 (0 hom., cov: 32)
  • Exomes 𝑓: 0.000012 (0 hom.)
• Consequence: SLC26A4 NM_000441.2 missense, splice_region
• Scores: Splicing: ADA: 0.9995
• Clinical Significance: Uncertain significance reviewed by expert panel P:5 U:3
• Conservation: PhyloP100: 8.16
• Publications: 12 publications found

Genes affected

SLC26A4 (HGNC:8818): (solute carrier family 26 member 4) Mutations in this gene are associated with Pendred syndrome, the most common form of syndromic deafness, an autosomal-recessive disease. It is highly homologous to the SLC26A3 gene; they have similar genomic structures and this gene is located 3' of the SLC26A3 gene. The encoded protein has homology to sulfate transporters. [provided by RefSeq, Jul 2008]

SLC26A4 Gene-Disease associations (from GenCC):

• autosomal recessive nonsyndromic hearing loss 4

  Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: Ambry Genetics, PanelApp Australia, Labcorp Genetics (formerly Invitae)
• Pendred syndrome

  Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: ClinGen, Ambry Genetics, Orphanet, Labcorp Genetics (formerly Invitae)
• athyreosis

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• thyroid hypoplasia

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• hearing loss, autosomal recessive

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ENSG00000300331 (HGNC:):

ACMG classification

Our verdict: Uncertain_significance. The variant received 5 ACMG points.

• PM2: For more information check the summary or visit ClinGen Evidence Repository.
• PM5: For more information check the summary or visit ClinGen Evidence Repository.
• PP3: For more information check the summary or visit ClinGen Evidence Repository.
• PP4: For more information check the summary or visit ClinGen Evidence Repository.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000441.2. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SLC26A4	NM_000441.2	MANE Select	c.1262A>G	p.Gln421Arg	missense splice_region	Exon 10 of 21	NP_000432.1	O43511-1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SLC26A4	ENST00000644269.2	MANE Select	c.1262A>G	p.Gln421Arg	missense splice_region	Exon 10 of 21	ENSP00000494017.1	O43511-1
	SLC26A4	ENST00000888701.1		c.1262A>G	p.Gln421Arg	missense splice_region	Exon 9 of 20	ENSP00000558760.1
	SLC26A4	ENST00000888700.1		c.1262A>G	p.Gln421Arg	missense splice_region	Exon 10 of 20	ENSP00000558759.1

Frequencies

GnomAD3 genomes AF: 0.0000197 AC: 3 AN: 152174 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.0000241

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: 0.0000294

Gnomad OTH AF: 0.00

GnomAD2 exomes AF: 0.0000120 AC: 3 AN: 250686 AF XY: 0.0000148

Gnomad AFR exome AF: 0.00

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: 0.0000265

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.0000122 AC: 17 AN: 1398330 Hom.: 0 Cov.: 24 AF XY: 0.0000114 AC XY: 8 AN XY: 699612

African (AFR) AF: 0.00 AC: 0 AN: 32224

American (AMR) AF: 0.00 AC: 0 AN: 44636

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25688

East Asian (EAS) AF: 0.00 AC: 0 AN: 39374

South Asian (SAS) AF: 0.00 AC: 0 AN: 85034

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53376

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5614

European-Non Finnish (NFE) AF: 0.0000161 AC: 17 AN: 1054090

Other (OTH) AF: 0.00 AC: 0 AN: 58294

GnomAD4 genome AF: 0.0000197 AC: 3 AN: 152174 Hom.: 0 Cov.: 32 AF XY: 0.0000135 AC XY: 1 AN XY: 74334

African (AFR) AF: 0.0000241 AC: 1 AN: 41442

American (AMR) AF: 0.00 AC: 0 AN: 15270

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3470

East Asian (EAS) AF: 0.00 AC: 0 AN: 5190

South Asian (SAS) AF: 0.00 AC: 0 AN: 4832

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10618

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 316

European-Non Finnish (NFE) AF: 0.0000294 AC: 2 AN: 68032

Other (OTH) AF: 0.00 AC: 0 AN: 2094

Alfa AF: 0.0000163 Hom.: 0

Bravo AF: 0.0000227

ESP6500AA AF: 0.00 AC: 0

ESP6500EA AF: 0.000116 AC: 1

ExAC AF: 0.00000824 AC: 1

EpiCase AF: 0.00

EpiControl AF: 0.000119

ClinVar

ClinVar submissions

Significance: Uncertain significance

Revision: reviewed by expert panel

Pathogenic	VUS	Benign	Condition
2	3	-	Pendred syndrome (5)
2	-	-	Autosomal recessive nonsyndromic hearing loss 4 (2)
1	-	-	not provided (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.92
BayesDel_addAF	Pathogenic	0.46	D
BayesDel_noAF	Pathogenic	0.48
CADD	Pathogenic	33
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.74	D
Eigen	Pathogenic	0.85
Eigen_PC	Pathogenic	0.79
FATHMM_MKL	Uncertain	0.96	D
LIST_S2	Uncertain	0.96	D
M_CAP	Pathogenic	0.30	D
MetaRNN	Pathogenic	0.95	D
MetaSVM	Pathogenic	0.98	D
MutationAssessor	Pathogenic	3.0	M
PhyloP100		8.2
PrimateAI	Uncertain	0.59	T
PROVEAN	Uncertain	-3.8	D
REVEL	Pathogenic	0.95
Sift	Uncertain	0.0010	D
Sift4G	Uncertain	0.0020	D
Polyphen		1.0	D
Vest4		0.97
MVP		0.98
MPC		0.076
ClinPred		0.99	D
GERP RS		5.1
Varity_R		0.94
gMVP		0.89
Mutation Taster		=3/97	disease causing (ClinVar)

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Pathogenic	1.0
dbscSNV1_RF	Pathogenic	0.98
SpliceAI score (max)		0.43		Details are displayed if max score is > 0.2
DS_DL_spliceai		0.43		Position offset: 1

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

Other links and lift over

dbSNP: rs201660407; hg19: chr7-107330681;