rs756818970

Positions:

• chr3-167807276-A-C
• chr3-167807276-A-T

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_001122752.2(SERPINI1):​c.914A>C​(p.Asp305Ala) variant causes a missense change. The variant allele was found at a frequency of 0.000000685 in 1,460,568 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 12/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: SERPINI1 NM_001122752.2 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 4.17

Genes affected

SERPINI1 (HGNC:8943): (serpin family I member 1) This gene encodes a member of the serpin superfamily of serine proteinase inhibitors. The protein is primarily secreted by axons in the brain, and preferentially reacts with and inhibits tissue-type plasminogen activator. It is thought to play a role in the regulation of axonal growth and the development of synaptic plasticity. Mutations in this gene result in familial encephalopathy with neuroserpin inclusion bodies (FENIB), which is a dominantly inherited form of familial encephalopathy and epilepsy characterized by the accumulation of mutant neuroserpin polymers. Multiple alternatively spliced variants, encoding the same protein, have been identified. [provided by RefSeq, Jul 2008]

(HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.24193606).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
SERPINI1	NM_001122752.2	c.914A>C	p.Asp305Ala	missense_variant	6/9	ENST00000446050.7	NP_001116224.1
SERPINI1	NM_005025.5	c.914A>C	p.Asp305Ala	missense_variant	6/9		NP_005016.1
SERPINI1	XM_017006618.3	c.914A>C	p.Asp305Ala	missense_variant	6/9		XP_016862107.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
SERPINI1	ENST00000446050.7	c.914A>C	p.Asp305Ala	missense_variant	6/9	1	NM_001122752.2	ENSP00000397373	P1
	ENST00000661269.1	n.545+3261T>G		intron_variant, non_coding_transcript_variant

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.85e-7 AC: 1 AN: 1460568 Hom.: 0 Cov.: 29 AF XY: 0.00 AC XY: 0 AN XY: 726660

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 9.00e-7

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

Alfa AF: 0.0000468 Hom.: 0

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Familial encephalopathy with neuroserpin inclusion bodies Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Oct 24, 2022

This sequence change replaces aspartic acid, which is acidic and polar, with alanine, which is neutral and non-polar, at codon 305 of the SERPINI1 protein (p.Asp305Ala). This variant is not present in population databases (gnomAD no frequency). In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is not expected to disrupt SERPINI1 protein function. ClinVar contains an entry for this variant (Variation ID: 534957). This variant has not been reported in the literature in individuals affected with SERPINI1-related conditions. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.12
BayesDel_addAF	Benign	-0.022	T
BayesDel_noAF	Benign	-0.27
CADD	Benign	23
DANN	Uncertain	0.99
DEOGEN2	Uncertain	0.46	T;T
Eigen	Uncertain	0.31
Eigen_PC	Uncertain	0.38
FATHMM_MKL	Uncertain	0.93	D
LIST_S2	Benign	0.72	.;T
M_CAP	Benign	0.018	T
MetaRNN	Benign	0.24	T;T
MetaSVM	Benign	-0.68	T
MutationAssessor	Benign	1.4	L;L
MutationTaster	Benign	1.0	D;D;D
PrimateAI	Benign	0.34	T
PROVEAN	Uncertain	-2.5	N;N
REVEL	Benign	0.21
Sift	Benign	0.13	T;T
Sift4G	Benign	0.099	T;T
Polyphen		0.0060	B;B
Vest4		0.36
MutPred		0.48		Gain of ubiquitination at K308 (P = 0.0913);Gain of ubiquitination at K308 (P = 0.0913);
MVP		0.32
MPC		0.11
ClinPred		0.71	D
GERP RS		5.4
Varity_R		0.56
gMVP		0.44

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

LitVar

Other links and lift over

dbSNP: rs756818970; hg19: chr3-167525064;