12-52286419-C-G

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_002281.4(KRT81):c.1354G>C(p.Val452Leu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000143 in 1,401,080 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 15/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: KRT81 NM_002281.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.61

Genes affected

KRT81 (HGNC:6458): (keratin 81) The protein encoded by this gene is a member of the keratin gene family. As a type II hair keratin, it is a basic protein which heterodimerizes with type I keratins to form hair and nails. The type II hair keratins are clustered in a region of chromosome 12q13 and are grouped into two distinct subfamilies based on structure similarity. One subfamily, consisting of KRTHB1, KRTHB3, and KRTHB6, is highly related. The other less-related subfamily includes KRTHB2, KRTHB4, and KRTHB5. All hair keratins are expressed in the hair follicle; this hair keratin, as well as KRTHB3 and KRTHB6, is found primarily in the hair cortex. Mutations in this gene and KRTHB6 have been observed in patients with a rare dominant hair disease, monilethrix. Some human genome assemblies (example T2T-CHM13) have a non-coding version of the gene due to the presence of a SNP that introduces a premature stop codon after codon 281. [provided by RefSeq, Jan 2024]

KRT86 (HGNC:6463): (keratin 86) This gene encodes a type II keratin protein, which heterodimerizes with type I keratins to form hair and nails. This gene is present in a cluster of related genes and pseudogenes on chromosome 12. Mutations in this gene have been observed in patients with the hair disease monilethrix. [provided by RefSeq, Feb 2016]

ACMG classification

Verdict is Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.071005404).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
KRT81	NM_002281.4	c.1354G>C	p.Val452Leu	missense_variant	9/9	ENST00000327741.9
KRT86	NM_001320198.2	c.-5+10473C>G		intron_variant		ENST00000423955.7
KRT81	XM_047428838.1	c.1354G>C	p.Val452Leu	missense_variant	10/10
KRT86	XM_005268866.5	c.129+10473C>G		intron_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
KRT81	ENST00000327741.9	c.1354G>C	p.Val452Leu	missense_variant	9/9	1	NM_002281.4	P1
KRT86	ENST00000423955.7	c.-5+10473C>G		intron_variant		2	NM_001320198.2	P1
KRT86	ENST00000553310.6	c.-4-15494C>G		intron_variant		4

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.00000143 AC: 2 AN: 1401080 Hom.: 0 Cov.: 33 AF XY: 0.00000145 AC XY: 1 AN XY: 691304

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: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000185

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Jun 16, 2023

The c.1354G>C (p.V452L) alteration is located in exon 9 (coding exon 9) of the KRT81 gene. This alteration results from a G to C substitution at nucleotide position 1354, causing the valine (V) at amino acid position 452 to be replaced by a leucine (L). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.12
BayesDel_addAF	Benign	-0.095	T
BayesDel_noAF	Benign	-0.37
Cadd	Benign	14
Dann	Benign	0.84
DEOGEN2	Benign	0.043	T;.
Eigen	Benign	-0.71
Eigen_PC	Benign	-0.69
FATHMM_MKL	Benign	0.072	N
LIST_S2	Benign	0.82	T;T
M_CAP	Benign	0.034	D
MetaRNN	Benign	0.071	T;T
MetaSVM	Benign	-0.81	T
MutationAssessor	Uncertain	2.1	M;.
MutationTaster	Benign	1.0	N;N
PrimateAI	Benign	0.35	T
PROVEAN	Benign	-0.68	N;.
REVEL	Benign	0.12
Sift	Benign	0.28	T;.
Sift4G	Benign	0.66	T;T
Polyphen		0.0030	B;.
Vest4		0.14
MutPred		0.36		Gain of catalytic residue at S451 (P = 0);Gain of catalytic residue at S451 (P = 0);
MVP		0.22
MPC		0.37
ClinPred		0.095	T
GERP RS		4.0
Varity_R		0.074
gMVP		0.055

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.080		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

No publications associated with this variant yet.

Other links and lift over

hg19: chr12-52680203;