chr7-92199034-T-C

Position:

• chr7-92199034-T-C

Variant summary

Our verdict is Benign. Variant got -14 ACMG points: 0P and 14B. BP4_Strong BP6_Moderate BS1 BS2

The NM_004912.4(KRIT1):​c.*1702A>G variant causes a 3 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00175 in 152,372 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★).

• Frequency:
  • Genomes: 𝑓 0.0018 (1 hom., cov: 32)
  • Exomes 𝑓: 0.0 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: KRIT1 NM_004912.4 3_prime_UTR
• Clinical Significance: Benign criteria provided, single submitter B:2
• Conservation: PhyloP100: -0.425

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]

ACMG classification

Verdict is Benign. Variant got -14 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.9).
• BP6: Variant 7-92199034-T-C is Benign according to our data. Variant chr7-92199034-T-C is described in ClinVar as [Benign]. Clinvar id is 360862.Status of the report is criteria_provided_single_submitter, 1 stars.
• BS1: Variant frequency is greater than expected in population amr. gnomad4 allele frequency = 0.00175 (267/152372) while in subpopulation AMR AF= 0.00392 (60/15306). AF 95% confidence interval is 0.00313. There are 1 homozygotes in gnomad4. There are 142 alleles in male gnomad4 subpopulation. Median coverage is 32. This position pass quality control queck.
• BS2: High AC in GnomAd4 at 267 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
KRIT1	NM_001013406.2	c.*1702A>G		3_prime_UTR_variant	17/17		NP_001013424.1
KRIT1	NM_001350669.1	c.*1702A>G		3_prime_UTR_variant	17/17		NP_001337598.1
KRIT1	NM_001350670.1	c.*1702A>G		3_prime_UTR_variant	18/18		NP_001337599.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
KRIT1	ENST00000394507.5	c.*1702A>G		3_prime_UTR_variant	20/20	5		ENSP00000378015	P1
KRIT1	ENST00000688180.1	n.2965A>G		non_coding_transcript_exon_variant	7/7

Frequencies

GnomAD3 genomes AF: 0.00176 AC: 268 AN: 152254 Hom.: 1 Cov.: 32

Gnomad AFR AF: 0.000820

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00393

Gnomad ASJ AF: 0.0115

Gnomad EAS AF: 0.000384

Gnomad SAS AF: 0.00248

Gnomad FIN AF: 0.000188

Gnomad MID AF: 0.0158

Gnomad NFE AF: 0.00148

Gnomad OTH AF: 0.00574

GnomAD4 exome Data not reliable, filtered out with message: AC0 AF: 0.00 AC: 0 AN: 2 Hom.: 0 Cov.: 0 AF XY: 0.00 AC XY: 0 AN XY: 2

Gnomad4 NFE exome AF: 0.00

GnomAD4 genome AF: 0.00175 AC: 267 AN: 152372 Hom.: 1 Cov.: 32 AF XY: 0.00191 AC XY: 142 AN XY: 74520

Gnomad4 AFR AF: 0.000794

Gnomad4 AMR AF: 0.00392

Gnomad4 ASJ AF: 0.0115

Gnomad4 EAS AF: 0.000578

Gnomad4 SAS AF: 0.00248

Gnomad4 FIN AF: 0.000188

Gnomad4 NFE AF: 0.00148

Gnomad4 OTH AF: 0.00568

Alfa AF: 0.00164 Hom.: 1

Bravo AF: 0.00194

Asia WGS AF: 0.00173 AC: 6 AN: 3478

ClinVar

Significance: Benign

Submissions summary: Benign:2

Revision: criteria provided, single submitter

Submissions by phenotype

Angiokeratoma corporis diffusum with arteriovenous fistulas Benign:1

Benign, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 13, 2018

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 and internal cut-off values, a variant classified as benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease. -

Cerebral cavernous malformation Benign:1

Benign, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 13, 2018

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 and internal cut-off values, a variant classified as benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.90
CADD	Benign	1.3
DANN	Benign	0.47

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.040		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: rs192818018; hg19: chr7-91828348;