12-52950790-G-A

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PM2 PP3

The NM_000224.3(KRT18):c.541G>A(p.Asp181Asn) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000274 in 1,458,914 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000027 (0 hom.)
• Consequence: KRT18 NM_000224.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 10.0

Genes affected

KRT18 (HGNC:6430): (keratin 18) KRT18 encodes the type I intermediate filament chain keratin 18. Keratin 18, together with its filament partner keratin 8, are perhaps the most commonly found members of the intermediate filament gene family. They are expressed in single layer epithelial tissues of the body. Mutations in this gene have been linked to cryptogenic cirrhosis. Two transcript variants encoding the same protein have been found for this gene. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Uncertain_significance. Variant got 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.765

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
KRT18	NM_000224.3	c.541G>A	p.Asp181Asn	missense_variant	3/7	ENST00000388835.4
KRT18	NM_199187.2	c.541G>A	p.Asp181Asn	missense_variant	4/8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
KRT18	ENST00000388835.4	c.541G>A	p.Asp181Asn	missense_variant	3/7	1	NM_000224.3	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000274 AC: 4 AN: 1458914 Hom.: 0 Cov.: 32 AF XY: 0.00000551 AC XY: 4 AN XY: 725626

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: 0.0000116

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000270

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

Bravo AF: 0.00000378

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Cirrhosis, familial Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Baylor Genetics

Jun 03, 2020

This variant was determined to be of uncertain significance according to ACMG Guidelines, 2015 [PMID:25741868]. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.96
BayesDel_addAF	Uncertain	0.084	D
BayesDel_noAF	Benign	-0.12
Cadd	Pathogenic	30
Dann	Uncertain	1.0
DEOGEN2	Pathogenic	0.83	D;.;D
Eigen	Uncertain	0.23
Eigen_PC	Uncertain	0.31
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Uncertain	0.86	D;D;.
M_CAP	Uncertain	0.086	D
MetaRNN	Pathogenic	0.77	D;D;D
MetaSVM	Uncertain	0.24	D
MutationAssessor	Benign	1.6	L;.;L
MutationTaster	Benign	1.0	D;D;D
PrimateAI	Uncertain	0.75	T
PROVEAN	Pathogenic	-4.6	D;D;D
REVEL	Uncertain	0.55
Sift	Uncertain	0.0070	D;D;D
Sift4G	Benign	0.11	T;T;T
Polyphen		0.42	B;B;B
Vest4		0.86
MutPred		0.64		Gain of catalytic residue at L185 (P = 0);Gain of catalytic residue at L185 (P = 0);Gain of catalytic residue at L185 (P = 0);
MVP		0.86
MPC		0.61
ClinPred		0.99	D
GERP RS		3.9
Varity_R		0.50
gMVP		0.75

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: rs1942470902; hg19: chr12-53344574;