NM_199342.4:c.82C>T

Variant names:

• chr1-42816463-G-A
• rs1570520175
• NM_199342.4:c.82C>T

Variant summary

Our verdict is Pathogenic. The variant received 14 ACMG points: 14P and 0B. PVS1_Strong PM2 PP5_Very_Strong

The NM_199342.4(SVBP):​c.82C>T​(p.Gln28*) variant causes a stop gained change. The variant allele was found at a frequency of 0.00000137 in 1,461,698 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: not found (cov: 32)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: SVBP NM_199342.4 stop_gained
• Clinical Significance: Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:4
• Conservation: PhyloP100: 6.39
• Publications: 0 publications found

Genes affected

SVBP (HGNC:29204): (small vasohibin binding protein) Enables microtubule binding activity. Involved in axon development; proteolysis; and regulation of metallopeptidase activity. Acts upstream of or within negative regulation of endothelial cell migration; negative regulation of protein ubiquitination; and protein secretion. Located in apical part of cell. [provided by Alliance of Genome Resources, Apr 2022]

TMEM269 (HGNC:52381): (transmembrane protein 269) Predicted to be integral component of membrane. [provided by Alliance of Genome Resources, Apr 2022]

ACMG classification

Our verdict: Pathogenic. The variant received 14 ACMG points.

• PVS1: Loss of function variant, product does not undergo nonsense mediated mRNA decay. Variant is located in the 3'-most 50 bp of the penultimate exon, not predicted to undergo nonsense mediated mRNA decay. Fraction of 0.592 CDS is truncated, and there are 3 pathogenic variants in the truncated region.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 1-42816463-G-A is Pathogenic according to our data. Variant chr1-42816463-G-A is described in ClinVar as [Likely_pathogenic]. Clinvar id is 635968.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
SVBP	NM_199342.4	c.82C>T	p.Gln28*	stop_gained	Exon 2 of 3	ENST00000372521.9	NP_955374.1
SVBP	XM_017001226.2	c.82C>T	p.Gln28*	stop_gained	Exon 2 of 3		XP_016856715.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SVBP	ENST00000372521.9	c.82C>T	p.Gln28*	stop_gained	Exon 2 of 3	1	NM_199342.4	ENSP00000361599.4
SVBP	ENST00000372522.5	c.82C>T	p.Gln28*	stop_gained	Exon 2 of 3	3		ENSP00000361600.1
SVBP	ENST00000497437.1	n.181C>T		non_coding_transcript_exon_variant	Exon 2 of 3	3
TMEM269	ENST00000421630.6	n.*424-72G>A		intron_variant	Intron 10 of 10	5		ENSP00000490287.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000137 AC: 2 AN: 1461698 Hom.: 0 Cov.: 30 AF XY: 0.00000138 AC XY: 1 AN XY: 727156

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR) AF: 0.00 AC: 0 AN: 33472

American (AMR) AF: 0.00 AC: 0 AN: 44712

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26134

East Asian (EAS) AF: 0.00 AC: 0 AN: 39698

South Asian (SAS) AF: 0.0000116 AC: 1 AN: 86248

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53402

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5768

European-Non Finnish (NFE) AF: 8.99e-7 AC: 1 AN: 1111876

Other (OTH) AF: 0.00 AC: 0 AN: 60388

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0.029673), which strongly suggests a high chance of mosaicism in these individuals.

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:4

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Neurodevelopmental disorder with ataxia, hypotonia, and microcephaly Pathogenic:2

Dec 02, 2019

OMIM

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: literature only

- -

Aug 21, 2019

Institute of Human Genetics, University of Leipzig Medical Center

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: research

- -

Lower limb spasticity;C3714756:Intellectual disability;C4551563:Microcephaly Pathogenic:1

Apr 04, 2019

Clinical and Biomedical Sciences, University of Exeter

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: research

- -

Neurodevelopmental disorder with ataxia Pathogenic:1

Oct 04, 2024

Al Jalila Children’s Genomics Center, Al Jalila Childrens Speciality Hospital

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: research

PVS1, PM3, PP1, PM2, PP4 -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.55	D
BayesDel_noAF	Pathogenic	0.56
CADD	Pathogenic	40
DANN	Uncertain	1.0
Eigen	Pathogenic	1.1
Eigen_PC	Pathogenic	0.98
FATHMM_MKL	Uncertain	0.87	D
PhyloP100		6.4
Vest4		0.48
GERP RS		5.3
PromoterAI		-0.038	Neutral
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Mutation Taster		=0/200	disease causing (ClinVar)

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		Details are displayed if max score is > 0.2

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

Other links and lift over

dbSNP: rs1570520175; hg19: chr1-43282134;