chr7-92241100-ACTTT-A

Variant names:

Variant summary

Our verdict is Pathogenic. The variant received 18 ACMG points: 18P and 0B. PVS1PM2PP5_Very_Strong

The NM_194454.3(KRIT1):c.151_154delAAAG(p.Lys51PhefsTer13) variant causes a frameshift change. The variant allele was found at a frequency of 0.000000685 in 1,459,252 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Pathogenic (★★). Variant results in nonsense mediated mRNA decay.

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 6.9e-7 ( 0 hom. )

Consequence

KRIT1
NM_194454.3 frameshift

Scores

Not classified

Clinical Significance

Pathogenic criteria provided, multiple submitters, no conflicts P:5

Conservation

PhyloP100: 7.03

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: Pathogenic. The variant received 18 ACMG points.

PVS1

Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.

PM2

Very rare variant in population databases, with high coverage;

PP5

Variant 7-92241100-ACTTT-A is Pathogenic according to our data. Variant chr7-92241100-ACTTT-A is described in ClinVar as Pathogenic. ClinVar VariationId is 279827.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
KRIT1	NM_194454.3 link	c.151_154delAAAG	p.Lys51PhefsTer13	frameshift_variant	Exon 5 of 19	ENST00000394505.7	NP_919436.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein
KRIT1	ENST00000394505.7 link	c.151_154delAAAG	p.Lys51PhefsTer13	frameshift_variant	Exon 5 of 19	1	NM_194454.3	ENSP00000378013.2
ENSG00000289027	ENST00000692281.1 link	c.151_154delAAAG	p.Lys51PhefsTer13	frameshift_variant	Exon 5 of 26			ENSP00000510568.1
ENSG00000285953	ENST00000458493.6 link	c.151_154delAAAG	p.Lys51PhefsTer13	frameshift_variant	Exon 4 of 20	4		ENSP00000396352.2

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

6.85e-7

AC:

AN:

1459252

Hom.:

AF XY:

0.00

AC XY:

AN XY:

726240

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33426

American (AMR)

AF:

0.00

AC:

AN:

44708

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26114

East Asian (EAS)

AF:

0.00

AC:

AN:

39656

South Asian (SAS)

AF:

0.00

AC:

AN:

86196

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53402

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5762

European-Non Finnish (NFE)

AF:

9.01e-7

AC:

AN:

1109658

Other (OTH)

AF:

0.00

AC:

AN:

60330

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.475

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

Alfa

AF:

0.00

Hom.:

Bravo

AF:

0.0000113

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:5

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Pathogenic:2

Jul 03, 2023

GeneDx

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Frameshift variant predicted to result in protein truncation or nonsense mediated decay in a gene for which loss-of-function is a known mechanism of disease; Not observed at significant frequency in large population cohorts (gnomAD); This variant is associated with the following publications: (PMID: 23595507, 12404106, 31254430, 30161288, 17043900) -

Jul 27, 2016

PreventionGenetics, part of Exact Sciences

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Inborn genetic diseases

Pathogenic:1

Mar 26, 2024

Ambry Genetics

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The c.151_154delAAAG (p.K51Ffs*13) alteration, located in exon 6 (coding exon 2) of the KRIT1 gene, consists of a deletion of 4 nucleotides from position 151 to 154, causing a translational frameshift with a predicted alternate stop codon after 13 amino acids. This alteration is expected to result in loss of function by premature protein truncation or nonsense-mediated mRNA decay. This variant was not reported in population-based cohorts in the Genome Aggregation Database (gnomAD). This variant was reported in multiple individuals with features consistent with KRIT1-related cerebral cavernous malformations and cosegregates with disease in several families (Nardella, 2018; Riant, 2013; Cavé-Riant, 2002). Based on the available evidence, this alteration is classified as pathogenic. -

Cerebral cavernous malformation 1

Pathogenic:1

Jul 09, 2025

Institute of Human Genetics, FAU Erlangen, Friedrich-Alexander-Universität Erlangen-Nürnberg

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This variant has been identified by standard clinical testing. -

Cerebral cavernous malformation

Pathogenic:1

Sep 16, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This sequence change creates a premature translational stop signal (p.Lys51Phefs*13) in the KRIT1 gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in KRIT1 are known to be pathogenic (PMID: 10508515, 11222804, 12404106, 24689081). This variant is not present in population databases (gnomAD no frequency). This premature translational stop signal has been observed in individual(s) with cerebral cavernous malformations (PMID: 12404106, 30161288). ClinVar contains an entry for this variant (Variation ID: 279827). For these reasons, this variant has been classified as Pathogenic. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

PhyloP100

7.0

Mutation Taster

=0/200

disease causing (ClinVar)

(source)

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

Publications

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over