NM_001365999.1:c.2550+5G>T

Variant names:

Variant summary

Our verdict is Benign. The variant received -20 ACMG points: 0P and 20B. BP4_StrongBP6_Very_StrongBS1BS2

The NM_001365999.1(SZT2):c.2550+5G>T variant causes a splice region, intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0138 in 1,613,440 control chromosomes in the GnomAD database, including 196 homozygotes. In-silico tool predicts a benign outcome for this variant. 3/3 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Benign (★★).

Frequency

Genomes: 𝑓 0.010 ( 13 hom., cov: 32)

Exomes 𝑓: 0.014 ( 183 hom. )

Consequence

SZT2
NM_001365999.1 splice_region, intron

Scores

Splicing: ADA: 0.8143

Clinical Significance

Benign criteria provided, multiple submitters, no conflicts B:7

Conservation

PhyloP100: 2.78

Publications

5 publications found

Variant links:

Genes affected

SZT2 (HGNC:29040): (SZT2 subunit of KICSTOR complex) The protein encoded by this gene is expressed in the brain, predominantly in the parietal and frontal cortex as well as in dorsal root ganglia. It is localized to the peroxisome, and is implicated in resistance to oxidative stress. It likely functions by increasing superoxide dismutase (SOD) activity, but itself has no direct SOD activity. Studies in mice show that this gene confers low seizure threshold, and may also enhance epileptogenesis. [provided by RefSeq, Jun 2011]

SZT2 Gene-Disease associations (from GenCC):

developmental and epileptic encephalopathy, 18
Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: Ambry Genetics, Labcorp Genetics (formerly Invitae), G2P, Illumina
genetic developmental and epileptic encephalopathy
Inheritance: AR Classification: DEFINITIVE Submitted by: ClinGen
undetermined early-onset epileptic encephalopathy
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

SZT2 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -20 ACMG points.

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.74).

BP6

Variant 1-43424867-G-T is Benign according to our data. Variant chr1-43424867-G-T is described in ClinVar as [Benign]. Clinvar id is 260614.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

BS1

Variant frequency is greater than expected in population nfe. GnomAd4 allele frequency = 0.0103 (1569/152234) while in subpopulation NFE AF = 0.0147 (997/68012). AF 95% confidence interval is 0.0139. There are 13 homozygotes in GnomAd4. There are 758 alleles in the male GnomAd4 subpopulation. Median coverage is 32. This position passed quality control check.

BS2

High Homozygotes in GnomAd4 at 13 AR,AD gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SZT2	NM_001365999.1 link	c.2550+5G>T		splice_region_variant, intron_variant	Intron 17 of 71	ENST00000634258.3	NP_001352928.1
SZT2	NM_015284.4 link	c.2550+5G>T		splice_region_variant, intron_variant	Intron 17 of 70		NP_056099.3	Q5T011-5

Ensembl

Gene	Transcript	HGVSc	Effect	Exon rank	TSL	MANE	Protein	UniProt
SZT2	ENST00000634258.3 link	c.2550+5G>T	splice_region_variant, intron_variant	Intron 17 of 71	5	NM_001365999.1	ENSP00000489255.1	Q5T011-1
SZT2	ENST00000562955.2 link	c.2550+5G>T	splice_region_variant, intron_variant	Intron 17 of 70	5		ENSP00000457168.1	Q5T011-5
SZT2	ENST00000470139.1 link	n.1281+5G>T	splice_region_variant, intron_variant	Intron 8 of 17	2		ENSP00000492726.1	A0A1W2PRY5

Frequencies

GnomAD3 genomes

AF:

0.0103

AC:

1563

AN:

152116

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00570

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0126

Gnomad ASJ

AF:

0.00404

Gnomad EAS

AF:

0.000193

Gnomad SAS

AF:

0.0106

Gnomad FIN

AF:

0.00330

Gnomad MID

AF:

0.0285

Gnomad NFE

AF:

0.0146

Gnomad OTH

AF:

0.0134

GnomAD2 exomes

AF:

0.0104

AC:

2615

AN:

251346

AF XY:

0.0109

show subpopulations

Gnomad AFR exome

AF:

0.00591

Gnomad AMR exome

AF:

0.00663

Gnomad ASJ exome

AF:

0.00477

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00411

Gnomad NFE exome

AF:

0.0154

Gnomad OTH exome

AF:

0.00962

GnomAD4 exome

AF:

0.0141

AC:

20652

AN:

1461206

Hom.:

183

Cov.:

AF XY:

0.0139

AC XY:

10088

AN XY:

726916

show subpopulations

African (AFR)

AF:

0.00529

AC:

177

AN:

33472

American (AMR)

AF:

0.00765

AC:

342

AN:

44710

Ashkenazi Jewish (ASJ)

AF:

0.00471

AC:

123

AN:

26130

East Asian (EAS)

AF:

0.0000504

AC:

AN:

39692

South Asian (SAS)

AF:

0.0115

AC:

994

AN:

86248

European-Finnish (FIN)

AF:

0.00610

AC:

326

AN:

53420

Middle Eastern (MID)

AF:

0.0106

AC:

AN:

5762

European-Non Finnish (NFE)

AF:

0.0161

AC:

17852

AN:

1111412

Other (OTH)

AF:

0.0128

AC:

775

AN:

60360

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.469

Heterozygous variant carriers

913

1826

2739

3652

4565

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

AF:

0.0103

AC:

1569

AN:

152234

Hom.:

Cov.:

AF XY:

0.0102

AC XY:

758

AN XY:

74450

show subpopulations

African (AFR)

AF:

0.00580

AC:

241

AN:

41518

American (AMR)

AF:

0.0126

AC:

193

AN:

15294

Ashkenazi Jewish (ASJ)

AF:

0.00404

AC:

AN:

3468

East Asian (EAS)

AF:

0.000193

AC:

AN:

5182

South Asian (SAS)

AF:

0.0108

AC:

AN:

4818

European-Finnish (FIN)

AF:

0.00330

AC:

AN:

10620

Middle Eastern (MID)

AF:

0.0272

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.0147

AC:

997

AN:

68012

Other (OTH)

AF:

0.0132

AC:

AN:

2116

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.503

Heterozygous variant carriers

157

236

314

393

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Alfa

AF:

0.00832

Hom.:

Bravo

AF:

0.0103

EpiCase

AF:

0.0128

EpiControl

AF:

0.0144

ClinVar

Significance: Benign

Submissions summary: Benign:7

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Benign:3

Aug 02, 2019

GeneDx

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Feb 04, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Breakthrough Genomics, Breakthrough Genomics

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:not provided

- -

not specified

Benign:2

PreventionGenetics, part of Exact Sciences

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Apr 04, 2024

Athena Diagnostics

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Developmental and epileptic encephalopathy, 18

Benign:1

Apr 11, 2023

Genome-Nilou Lab

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Inborn genetic diseases

Benign:1

Apr 23, 2016

Ambry Genetics

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This alteration is classified as benign based on a combination of the following: seen in unaffected individuals, population frequency, intact protein function, lack of segregation with disease, co-occurrence, RNA analysis, in silico models, amino acid conservation, lack of disease association in case-control studies, and/or the mechanism of disease or impacted region is inconsistent with a known cause of pathogenicity. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.74

CADD

Benign

(source)

DANN

Benign

0.60

PhyloP100

2.8

Mutation Taster

=100/0

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

dbscSNV1_ADA

Benign

0.81

dbscSNV1_RF

Benign

0.57

SpliceAI score (max)

0.020

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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NM_001365999.1:c.2550+5G>T

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