chr12-52487755-T-C

Position:

• chr12-52487755-T-C

Variant summary

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

The NM_005554.4(KRT6A):​c.1660A>G​(p.Thr554Ala) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. 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)
• Consequence: KRT6A NM_005554.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.957

Genes affected

KRT6A (HGNC:6443): (keratin 6A) The protein encoded by this gene is a member of the keratin gene family. The type II cytokeratins consist of basic or neutral proteins which are arranged in pairs of heterotypic keratin chains coexpressed during differentiation of simple and stratified epithelial tissues. As many as six of this type II cytokeratin (KRT6) have been identified; the multiplicity of the genes is attributed to successive gene duplication events. The genes are expressed with family members KRT16 and/or KRT17 in the filiform papillae of the tongue, the stratified epithelial lining of oral mucosa and esophagus, the outer root sheath of hair follicles, and the glandular epithelia. This KRT6 gene in particular encodes the most abundant isoform. Mutations in these genes have been associated with pachyonychia congenita. In addition, peptides from the C-terminal region of the protein have antimicrobial activity against bacterial pathogens. The type II cytokeratins are clustered in a region of chromosome 12q12-q13. [provided by RefSeq, Oct 2014]

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=0.13240081).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
KRT6A	NM_005554.4	c.1660A>G	p.Thr554Ala	missense_variant	9/9	ENST00000330722.7	NP_005545.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
KRT6A	ENST00000330722.7	c.1660A>G	p.Thr554Ala	missense_variant	9/9	1	NM_005554.4	ENSP00000369317	P1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 35

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

CeGaT Center for Human Genetics Tuebingen

Feb 01, 2022

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.11
BayesDel_addAF	Benign	-0.046	T
BayesDel_noAF	Benign	-0.30
CADD	Benign	19
DANN	Benign	0.96
DEOGEN2	Benign	0.25	T
Eigen	Benign	-0.73
Eigen_PC	Benign	-0.73
FATHMM_MKL	Benign	0.042	N
LIST_S2	Benign	0.48	T
M_CAP	Benign	0.031	D
MetaRNN	Benign	0.13	T
MetaSVM	Benign	-0.80	T
MutationAssessor	Uncertain	2.6	M
MutationTaster	Benign	1.0	N
PrimateAI	Benign	0.38	T
PROVEAN	Benign	-1.8	N
REVEL	Benign	0.23
Sift	Benign	0.075	T
Sift4G	Uncertain	0.053	T
Polyphen		0.0030	B
Vest4		0.14
MutPred		0.26		Gain of catalytic residue at S555 (P = 0.0115);
MVP		0.59
MPC		0.28
ClinPred		0.89	D
GERP RS		0.86
Varity_R		0.081
gMVP		0.37

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: rs1565585033; hg19: chr12-52881539;