7-107701101-G-T

Variant names:

• chr7-107701101-G-T
• rs397516421
• NM_000441.2:c.1708G>T

Variant summary

Our verdict is Pathogenic. The variant received 12 ACMG points: 12P and 0B. PM1 PM2 PM5 PP2 PP3_Strong PP5

The NM_000441.2(SLC26A4):​c.1708G>T​(p.Val570Phe) variant causes a missense, splice region change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000139 in 1,434,714 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. 3/3 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as Likely pathogenic (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. V570I) has been classified as Likely pathogenic.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: SLC26A4 NM_000441.2 missense, splice_region
• Scores: Splicing: ADA: 1.000
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 7.68
• Publications: 0 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: Ambry Genetics, Orphanet, Labcorp Genetics (formerly Invitae), ClinGen
• 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

ACMG classification

Our verdict: Pathogenic. The variant received 12 ACMG points.

• PM1: In a hotspot region, there are 6 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 8 uncertain in NM_000441.2
• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr7-107701101-G-A is described in ClinVar as Likely_pathogenic. ClinVar VariationId is 43521.Status of the report is reviewed_by_expert_panel, 3 stars.
• PP2: Missense variant in the gene, where a lot of missense mutations are associated with disease in ClinVar. The gene has 167 curated pathogenic missense variants (we use a threshold of 10). The gene has 19 curated benign missense variants. Trascript score misZ: -1.7621 (below the threshold of 3.09). GenCC associations: The gene is linked to autosomal recessive nonsyndromic hearing loss 4, Pendred syndrome, athyreosis, thyroid hypoplasia, hearing loss, autosomal recessive.
• PP3: Splicing predictors support a deleterious effect. Scorers claiming Pathogenic: dbscSNV1_ADA, dbscSNV1_RF, max_spliceai. No scorers claiming Uncertain. No scorers claiming Benign.
• PP5: Variant 7-107701101-G-T is Pathogenic according to our data. Variant chr7-107701101-G-T is described in ClinVar as Likely_pathogenic. ClinVar VariationId is 3774351.Status of the report is no_assertion_criteria_provided, 0 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SLC26A4	NM_000441.2	c.1708G>T	p.Val570Phe	missense_variant, splice_region_variant	Exon 16 of 21	ENST00000644269.2	NP_000432.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SLC26A4	ENST00000644269.2	c.1708G>T	p.Val570Phe	missense_variant, splice_region_variant	Exon 16 of 21		NM_000441.2	ENSP00000494017.1
SLC26A4	ENST00000480841.5	n.557G>T		splice_region_variant, non_coding_transcript_exon_variant	Exon 7 of 8	3
SLC26A4	ENST00000644846.1	n.418G>T		splice_region_variant, non_coding_transcript_exon_variant	Exon 6 of 10			ENSP00000494344.1
SLC26A4	ENST00000492030.2	n.91-726G>T		intron_variant	Intron 1 of 5	5

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000139 AC: 2 AN: 1434714 Hom.: 0 Cov.: 26 AF XY: 0.00000140 AC XY: 1 AN XY: 715664

African (AFR) AF: 0.00 AC: 0 AN: 32938

American (AMR) AF: 0.00 AC: 0 AN: 44660

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25960

East Asian (EAS) AF: 0.00 AC: 0 AN: 39546

South Asian (SAS) AF: 0.00 AC: 0 AN: 85690

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53370

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5712

European-Non Finnish (NFE) AF: 0.00000184 AC: 2 AN: 1087426

Other (OTH) AF: 0.00 AC: 0 AN: 59412

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.71
BayesDel_addAF	Pathogenic	0.43	D
BayesDel_noAF	Pathogenic	0.38
CADD	Pathogenic	29
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.61	D;D
Eigen	Pathogenic	0.93
Eigen_PC	Pathogenic	0.90
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Uncertain	0.87	.;D
M_CAP	Uncertain	0.22	D
MetaRNN	Pathogenic	0.87	D;D
MetaSVM	Uncertain	0.77	D
MutationAssessor	Uncertain	2.8	M;M
PhyloP100		7.7
PrimateAI	Uncertain	0.71	T
PROVEAN	Uncertain	-3.9	D;.
REVEL	Pathogenic	0.82
Sift	Uncertain	0.0030	D;.
Sift4G	Uncertain	0.015	D;.
Polyphen		1.0	D;D
Vest4		0.87
MutPred		0.57		Gain of helix (P = 0.132);Gain of helix (P = 0.132);
MVP		1.0
MPC		0.075
ClinPred		1.0	D
GERP RS		5.7
Varity_R		0.92
gMVP		0.90
Mutation Taster		=6/94	disease causing

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Pathogenic	1.0
dbscSNV1_RF	Pathogenic	0.99
SpliceAI score (max)		0.62		Details are displayed if max score is > 0.2
DS_AL_spliceai		0.62		Position offset: 0

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

Other links and lift over

dbSNP: rs397516421; hg19: chr7-107341546;