NM_199342.4:c.146T>C

Variant names:

• chr1-42807469-A-G
• rs750216083
• NM_199342.4:c.146T>C

Variant summary

Our verdict is Uncertain significance. The variant received 3 ACMG points: 3P and 0B. PP2 PP5_Moderate

The NM_199342.4(SVBP):​c.146T>C​(p.Leu49Pro) variant causes a missense change. The variant allele was found at a frequency of 0.00000479 in 1,461,722 control chromosomes in the GnomAD database, with no homozygous occurrence. There is a variant allele frequency bias in the population database for this variant (GnomAdExome4), which may indicate mosaicism or somatic mutations in the reference population data. Variant has been reported in ClinVar as Likely pathogenic (★).

• Frequency:
  • Genomes: not found (cov: 31)
  • Exomes 𝑓: 0.0000048 (0 hom.)
• Consequence: SVBP NM_199342.4 missense
• Clinical Significance: Likely pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 6.53
• Publications: 3 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: Uncertain_significance. The variant received 3 ACMG points.

• PP2: Missense variant in the gene, where a lot of missense mutations are associated with disease in ClinVar. The gene has 1 curated pathogenic missense variants (we use a threshold of 10). The gene has 0 curated benign missense variants. Gene score misZ: 0.3744 (below the threshold of 3.09). Trascript score misZ: 0.51921 (below the threshold of 3.09). GenCC associations: The gene is linked to syndromic intellectual disability.
• PP5: Variant 1-42807469-A-G is Pathogenic according to our data. Variant chr1-42807469-A-G is described in ClinVar as [Likely_pathogenic]. Clinvar id is 2500213.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SVBP	NM_199342.4	c.146T>C	p.Leu49Pro	missense_variant	Exon 3 of 3	ENST00000372521.9	NP_955374.1
SVBP	XM_017001226.2	c.146T>C	p.Leu49Pro	missense_variant	Exon 3 of 3		XP_016856715.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SVBP	ENST00000372521.9	c.146T>C	p.Leu49Pro	missense_variant	Exon 3 of 3	1	NM_199342.4	ENSP00000361599.4
SVBP	ENST00000372522.5	c.146T>C	p.Leu49Pro	missense_variant	Exon 3 of 3	3		ENSP00000361600.1
TMEM269	ENST00000421630.6	n.*196-1559A>G		intron_variant	Intron 8 of 10	5		ENSP00000490287.1

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD2 exomes AF: 0.0000119 AC: 3 AN: 251362 AF XY: 0.0000147

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.0000579

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00000880

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000479 AC: 7 AN: 1461722 Hom.: 0 Cov.: 29 AF XY: 0.00000413 AC XY: 3 AN XY: 727174

⚠️ 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: 33478

American (AMR) AF: 0.0000671 AC: 3 AN: 44716

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26132

East Asian (EAS) AF: 0.00 AC: 0 AN: 39696

South Asian (SAS) AF: 0.00 AC: 0 AN: 86248

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53406

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

European-Non Finnish (NFE) AF: 0.00000270 AC: 3 AN: 1111886

Other (OTH) AF: 0.0000166 AC: 1 AN: 60392

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0.001057), which strongly suggests a high chance of mosaicism in these individuals.

GnomAD4 genome Cov.: 31

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.00000756

TwinsUK AF: 0.00 AC: 0

ALSPAC AF: 0.000259 AC: 1

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

SVBP-related disorder Pathogenic:1

Apr 27, 2023

Neurometabolic Diseases Laboratory, Bellvitge Biomedical Research Institute (IDIBELL)

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: research

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Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.99
BayesDel_addAF	Uncertain	0.068	T
BayesDel_noAF	Uncertain	0.040
CADD	Pathogenic	28
DANN	Uncertain	1.0
DEOGEN2	Benign	0.16	T;T
Eigen	Benign	0.022
Eigen_PC	Benign	0.19
FATHMM_MKL	Uncertain	0.93	D
LIST_S2	Benign	0.66	.;T
M_CAP	Benign	0.031	D
MetaRNN	Uncertain	0.52	D;D
MetaSVM	Benign	-0.93	T
PhyloP100		6.5
PrimateAI	Pathogenic	0.86	D
PROVEAN	Pathogenic	-6.2	D;D
REVEL	Uncertain	0.31
Sift	Pathogenic	0.0	D;D
Sift4G	Uncertain	0.040	D;D
Polyphen		0.0020	B;B
Vest4		0.91
MutPred		0.38		Gain of loop (P = 0);Gain of loop (P = 0);
MVP		0.27
MPC		0.86
ClinPred		0.96	D
GERP RS		4.8
Varity_R		0.98
gMVP		0.74
Mutation Taster		=33/67	disease causing

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

Other links and lift over

dbSNP: rs750216083; hg19: chr1-43273140;