NM_153816.6:c.2670delT

Variant names:

Variant summary

Our verdict is Pathogenic. The variant received 18 ACMG points: 18P and 0B. PVS1PM2PP5_Very_Strong

The NM_153816.6(SNX14):c.2670delT(p.Cys890fs) variant causes a frameshift change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000403 in 1,612,764 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Pathogenic (★★). Variant results in nonsense mediated mRNA decay.

Frequency

Genomes: 𝑓 0.000013 ( 0 hom., cov: 31)

Exomes 𝑓: 0.000043 ( 0 hom. )

Consequence

SNX14
NM_153816.6 frameshift

Scores

Not classified

Clinical Significance

Pathogenic criteria provided, multiple submitters, no conflicts P:6

Conservation

PhyloP100: 0.942

Publications

2 publications found

Variant links:

Genes affected

SNX14 (HGNC:14977): (sorting nexin 14) This gene encodes a member of the sorting nexin family. Members of this family have a phox (PX) phosphoinositide binding domain and are involved in intracellular trafficking. The encoded protein also contains a regulator of G protein signaling (RGS) domain. Regulator of G protein signaling family members are regulatory molecules that act as GTPase activating proteins for G alpha subunits of heterotrimeric G proteins. Alternate splicing results in transcript variants encoding distinct isoforms. [provided by RefSeq, Jul 2014]

SNX14 Gene-Disease associations (from GenCC):

autosomal recessive spinocerebellar ataxia 20
Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: G2P, Orphanet, Labcorp Genetics (formerly Invitae), Ambry Genetics, PanelApp Australia

SNX14 links:

ENSG00000271793 (HGNC:):

ENSG00000271793 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Pathogenic. The variant received 18 ACMG points.

PVS1

Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.

PM2

Very rare variant in population databases, with high coverage;

PP5

Variant 6-85508042-TA-T is Pathogenic according to our data. Variant chr6-85508042-TA-T is described in ClinVar as Pathogenic. ClinVar VariationId is 190320.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SNX14	NM_153816.6 link	c.2670delT	p.Cys890fs	frameshift_variant	Exon 27 of 29	ENST00000314673.8	NP_722523.1	Q9Y5W7-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
SNX14	ENST00000314673.8 link	c.2670delT	p.Cys890fs	frameshift_variant	Exon 27 of 29	1	NM_153816.6	ENSP00000313121.3	Q9Y5W7-1
ENSG00000271793	ENST00000682083.1 link	n.*2580delT		non_coding_transcript_exon_variant	Exon 38 of 40			ENSP00000506859.1
ENSG00000271793	ENST00000682083.1 link	n.*2580delT		3_prime_UTR_variant	Exon 38 of 40			ENSP00000506859.1

Frequencies

GnomAD3 genomes

AF:

0.0000131

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:

0.00

Gnomad NFE

AF:

0.0000294

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.0000639

AC:

AN:

250206

AF XY:

0.0000518

show subpopulations

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:

0.000141

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000431

AC:

AN:

1460604

Hom.:

Cov.:

AF XY:

0.0000468

AC XY:

AN XY:

726594

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33438

American (AMR)

AF:

0.00

AC:

AN:

44612

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26108

East Asian (EAS)

AF:

0.00

AC:

AN:

39602

South Asian (SAS)

AF:

0.00

AC:

AN:

86104

European-Finnish (FIN)

AF:

0.0000188

AC:

AN:

53308

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5762

European-Non Finnish (NFE)

AF:

0.0000558

AC:

AN:

1111340

Other (OTH)

AF:

0.00

AC:

AN:

60330

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.475

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.0000131

AC:

AN:

152160

Hom.:

Cov.:

AF XY:

0.0000134

AC XY:

AN XY:

74350

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

41448

American (AMR)

AF:

0.00

AC:

AN:

15268

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3468

East Asian (EAS)

AF:

0.00

AC:

AN:

5200

South Asian (SAS)

AF:

0.00

AC:

AN:

4832

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10614

Middle Eastern (MID)

AF:

0.00

AC:

AN:

316

European-Non Finnish (NFE)

AF:

0.0000294

AC:

AN:

68008

Other (OTH)

AF:

0.00

AC:

AN:

2094

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.450

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.0000712

Hom.:

Bravo

AF:

0.0000113

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:6

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Autosomal recessive spinocerebellar ataxia 20

Pathogenic:3

May 01, 2015

OMIM

Significance:Pathogenic

Review Status:no assertion criteria provided

Collection Method:literature only

- -

May 02, 2023

Broad Center for Mendelian Genomics, Broad Institute of MIT and Harvard

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:curation

The homozygous p.Lys889_Cys890insTer variant in SNX14 was identified by our study in one individual with spinocerebellar ataxia. The p.Lys889_Cys890insTer variant in SNX14 has been previously reported in 4 affected relatives from one family with autosomal recessive spinocerebellar ataxia 20 (PMID: 25848753) but has been identified in 0.01% (17/128632) of European (non-Finnish) chromosomes by the Genome Aggregation Database (gnomAD, http://gnomad.broadinstitute.org; dbSNP ID: rs774694340). Although this variant has been seen in the general population in a heterozygous state, its frequency is low enough to be consistent with a recessive carrier frequency. These 4 affected individuals were homozygotes (PMID: 25848753), and the individual identified by our study was also a homozygote, which increases the likelihood that the p.Lys889_Cys890insTer variant is pathogenic. This variant has also been reported in ClinVar (Variation ID: 190320) and has been interpreted as pathogenic by OMIM, GeneDx, HudsonAlpha Institute for Biotechnology, and CeGaT Center for Human Genetics Tuebingen. This variant is predicted to cause a frameshift, which alters the protein‚Äôs amino acid sequence beginning at position 889 and leads to a premature termination codon 1 amino acids downstream. This alteration is then predicted to lead to a truncated or absent protein. Loss of function of the SNX14 gene is an established disease mechanism in autosomal recessive spinocerebellar ataxia 20. In summary, this variant meets criteria to be classified as pathogenic for autosomal recessive spinocerebellar ataxia 20. ACMG/AMP Criteria applied: PVS1, PM2_Supporting, PM3, PP1_Moderate (Richards 2015). -

Jan 12, 2017

HudsonAlpha Institute for Biotechnology, HudsonAlpha Institute for Biotechnology

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:research

- -

not provided

Pathogenic:3

Jul 01, 2020

CeGaT Center for Human Genetics Tuebingen

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Mar 27, 2023

GeneDx

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Not observed at significant frequency in large population cohorts (gnomAD); Nonsense variant predicted to result in protein truncation or nonsense mediated decay in a gene for which loss of function is a known mechanism of disease; This variant is associated with the following publications: (PMID: 25848753, 34426522) -

Mar 08, 2024

Clinical Genetics Laboratory, Skane University Hospital Lund

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

PhyloP100

0.94

Mutation Taster

=0/200

disease causing (ClinVar)

(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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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