NM_194454.3:c.451A>G

Variant names:

Variant summary

Our verdict is Likely benign. The variant received -5 ACMG points: 0P and 5B. BP4BS2

The NM_194454.3(KRIT1):c.451A>G(p.Thr151Ala) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000413 in 1,454,476 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/22 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: 0.0000041 ( 0 hom. )

Consequence

KRIT1
NM_194454.3 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:5

Conservation

PhyloP100: 2.39

Publications

0 publications found

Variant links:

Genes affected

KRIT1 (HGNC:1573): (KRIT1 ankyrin repeat containing) This gene encodes a protein containing four ankyrin repeats, a band 4.1/ezrin/radixin/moesin (FERM) domain, and multiple NPXY sequences. The encoded protein is localized in the nucleus and cytoplasm. It binds to integrin cytoplasmic domain-associated protein-1 alpha (ICAP1alpha), and plays a critical role in beta1-integrin-mediated cell proliferation. It associates with junction proteins and RAS-related protein 1A (Rap1A), which requires the encoded protein for maintaining the integrity of endothelial junctions. It is also a microtubule-associated protein and may play a role in microtubule targeting. Mutations in this gene result in cerebral cavernous malformations. Multiple alternatively spliced transcript variants have been found for this gene. [provided by RefSeq, Sep 2009]

KRIT1 Gene-Disease associations (from GenCC):

cerebral cavernous malformation 1
Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: G2P, Genomics England PanelApp, Ambry Genetics, Labcorp Genetics (formerly Invitae)
famililal cerebral cavernous malformations
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

KRIT1 links:

ENSG00000289027 (HGNC:):

ENSG00000289027 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -5 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.2705971).

BS2

High AC in GnomAdExome4 at 6 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
KRIT1	NM_194454.3 link	c.451A>G	p.Thr151Ala	missense_variant	Exon 7 of 19	ENST00000394505.7	NP_919436.1	O00522-1A4D1F7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
KRIT1	ENST00000394505.7 link	c.451A>G	p.Thr151Ala	missense_variant	Exon 7 of 19	1	NM_194454.3	ENSP00000378013.2	O00522-1
ENSG00000289027	ENST00000692281.1 link	c.451A>G	p.Thr151Ala	missense_variant	Exon 7 of 26			ENSP00000510568.1	A0A8I5KWQ7
ENSG00000285953	ENST00000458493.6 link	c.451A>G	p.Thr151Ala	missense_variant	Exon 6 of 20	4		ENSP00000396352.2	C9JD81

Frequencies

GnomAD3 genomes

Cov.:

GnomAD2 exomes

AF:

0.00000398

AC:

AN:

251118

AF XY:

0.00000737

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000289

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000413

AC:

AN:

1454476

Hom.:

Cov.:

AF XY:

0.00000691

AC XY:

AN XY:

724074

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33282

American (AMR)

AF:

0.0000224

AC:

AN:

44694

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26066

East Asian (EAS)

AF:

0.0000253

AC:

AN:

39570

South Asian (SAS)

AF:

0.00

AC:

AN:

86108

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53250

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5744

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

1105594

Other (OTH)

AF:

0.0000665

AC:

AN:

60168

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.483

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

Cov.:

Alfa

AF:

0.00

Hom.:

Bravo

AF:

0.0000189

ExAC

AF:

0.00000824

AC:

Asia WGS

AF:

0.00173

AC:

AN:

3474

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:5

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Cerebral cavernous malformation

Uncertain:2

May 15, 2020

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

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. Algorithms developed to predict the effect of missense changes on protein structure and function output the following: SIFT: "Tolerated"; PolyPhen-2: "Benign"; Align-GVGD: "Class C0". The alanine amino acid residue is found in multiple mammalian species, suggesting that this missense change does not adversely affect protein function. These predictions have not been confirmed by published functional studies and their clinical significance is uncertain. This variant has not been reported in the literature in individuals with KRIT1-related conditions. ClinVar contains an entry for this variant (Variation ID: 468216). This variant is present in population databases (rs774330517, ExAC 0.009%). This sequence change replaces threonine with alanine at codon 151 of the KRIT1 protein (p.Thr151Ala). The threonine residue is moderately conserved and there is a small physicochemical difference between threonine and alanine. -

Jan 13, 2018

Illumina Laboratory Services, Illumina

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease. -

Inborn genetic diseases

Uncertain:1

Jun 03, 2025

Ambry Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The c.451A>G (p.T151A) alteration is located in exon 8 (coding exon 4) of the KRIT1 gene. This alteration results from a A to G substitution at nucleotide position 451, causing the threonine (T) at amino acid position 151 to be replaced by an alanine (A). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Angiokeratoma corporis diffusum with arteriovenous fistulas

Uncertain:1

Jan 13, 2018

Illumina Laboratory Services, Illumina

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

KRIT1-related disorder

Uncertain:1

Apr 03, 2024

PreventionGenetics, part of Exact Sciences

Significance:Uncertain significance

Review Status:no assertion criteria provided

Collection Method:clinical testing

The KRIT1 c.451A>G variant is predicted to result in the amino acid substitution p.Thr151Ala. To our knowledge, this variant has not been reported in the literature. This variant is reported in 0.0029% of alleles in individuals of Latino descent in gnomAD. At this time, the clinical significance of this variant is uncertain due to the absence of conclusive functional and genetic evidence. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.078

BayesDel_addAF

Benign

-0.035

BayesDel_noAF

Benign

-0.21

CADD

Benign

(source)

DANN

Uncertain

0.98

DEOGEN2

Benign

0.36

.;T;T;T;T;.;T;D;.

Eigen

Benign

-0.27

Eigen_PC

Benign

-0.14

FATHMM_MKL

Uncertain

0.88

LIST_S2

Benign

0.67

T;T;.;.;.;T;T;T;T

M_CAP

Benign

0.030

MetaRNN

Benign

0.27

T;T;T;T;T;T;T;T;T

MetaSVM

Benign

-0.51

MutationAssessor

Benign

1.7

.;L;L;L;L;L;.;.;.

PhyloP100

2.4

PrimateAI

Benign

0.42

PROVEAN

Benign

-0.77

.;N;N;N;N;N;N;D;D

REVEL

Benign

0.095

Sift

Benign

0.12

.;T;T;T;T;T;T;T;T

Sift4G

Benign

0.19

.;T;T;T;T;T;T;.;.

Polyphen

0.14

.;B;B;B;B;.;.;.;.

Vest4

0.28, 0.27, 0.30, 0.28, 0.26

MutPred

0.70

Loss of phosphorylation at T147 (P = 0.1376);Loss of phosphorylation at T147 (P = 0.1376);Loss of phosphorylation at T147 (P = 0.1376);Loss of phosphorylation at T147 (P = 0.1376);Loss of phosphorylation at T147 (P = 0.1376);Loss of phosphorylation at T147 (P = 0.1376);Loss of phosphorylation at T147 (P = 0.1376);Loss of phosphorylation at T147 (P = 0.1376);Loss of phosphorylation at T147 (P = 0.1376);

MVP

0.84

MPC

0.28

ClinPred

0.12

GERP RS

2.8

Varity_R

0.14

gMVP

0.33

Mutation Taster

=51/49

polymorphism

(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

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over