12-52949280-A-G

Variant names:

• chr12-52949280-A-G
• rs891346528
• NM_000224.3:c.107A>G

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM1 PM2

The NM_000224.3(KRT18):​c.107A>G​(p.Tyr36Cys) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000137 in 1,458,444 control chromosomes in the GnomAD database, with no homozygous occurrence. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: not found (cov: 40)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: KRT18 NM_000224.3 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 3.06

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]

KRT8 (HGNC:6446): (keratin 8) This gene is a member of the type II keratin family clustered on the long arm of chromosome 12. Type I and type II keratins heteropolymerize to form intermediate-sized filaments in the cytoplasm of epithelial cells. The product of this gene typically dimerizes with keratin 18 to form an intermediate filament in simple single-layered epithelial cells. This protein plays a role in maintaining cellular structural integrity and also functions in signal transduction and cellular differentiation. Mutations in this gene cause cryptogenic cirrhosis. Alternatively spliced transcript variants have been found for this gene. [provided by RefSeq, Jan 2012]

ACMG classification

Verdict is Uncertain_significance. Variant got 4 ACMG points.

• PM1: In a modified_residue Phosphotyrosine (size 0) in uniprot entity K1C18_HUMAN
• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
KRT18	NM_000224.3	c.107A>G	p.Tyr36Cys	missense_variant	Exon 1 of 7	ENST00000388835.4	NP_000215.1
KRT18	NM_199187.2	c.107A>G	p.Tyr36Cys	missense_variant	Exon 2 of 8		NP_954657.1
KRT8	NM_001256293.2	c.-47+435T>C		intron_variant	Intron 1 of 8		NP_001243222.1
KRT8	NR_045962.2	n.405+176T>C		intron_variant	Intron 1 of 8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
KRT18	ENST00000388835.4	c.107A>G	p.Tyr36Cys	missense_variant	Exon 1 of 7	1	NM_000224.3	ENSP00000373487.3

Frequencies

GnomAD3 genomes Cov.: 40

GnomAD4 exome AF: 0.00000137 AC: 2 AN: 1458444 Hom.: 0 Cov.: 36 AF XY: 0.00000138 AC XY: 1 AN XY: 725544

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.0000252

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.: 40

Bravo AF: 0.00000378

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.50
BayesDel_addAF	Pathogenic	0.20	D
BayesDel_noAF	Uncertain	0.060
CADD	Uncertain	26
DANN	Uncertain	0.99
DEOGEN2	Uncertain	0.57	D;.;D
Eigen	Benign	-0.035
Eigen_PC	Benign	0.053
FATHMM_MKL	Pathogenic	0.97	D
LIST_S2	Benign	0.80	T;T;.
M_CAP	Pathogenic	0.29	D
MetaRNN	Uncertain	0.54	D;D;D
MetaSVM	Uncertain	-0.18	T
MutationAssessor	Benign	1.8	L;.;L
PrimateAI	Pathogenic	0.83	D
PROVEAN	Pathogenic	-5.2	D;D;D
REVEL	Uncertain	0.62
Sift	Uncertain	0.010	D;D;D
Sift4G	Benign	0.084	T;T;T
Polyphen		0.071	B;B;B
Vest4		0.58
MutPred		0.46		Gain of catalytic residue at G40 (P = 0);Gain of catalytic residue at G40 (P = 0);Gain of catalytic residue at G40 (P = 0);
MVP		0.85
MPC		0.73
ClinPred		0.94	D
GERP RS		3.7
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.35
gMVP		0.76

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: rs891346528; hg19: chr12-53343064;