17-40928252-T-A

Position:

• chr17-40928252-T-A

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_015515.5(KRT23):​c.907A>T​(p.Thr303Ser) 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. 16/21 in silico tools predict a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. T303A) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 31)
• Consequence: KRT23 NM_015515.5 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.353

Genes affected

KRT23 (HGNC:6438): (keratin 23) The protein encoded by this gene is a member of the keratin family. The keratins are intermediate filament proteins responsible for the structural integrity of epithelial cells and are subdivided into cytokeratins and hair keratins. The type I cytokeratins consist of acidic proteins which are arranged in pairs of heterotypic keratin chains. The type I cytokeratin genes are clustered in a region of chromosome 17q12-q21. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Sep 2013]

KRT23 (HGNC:):

ACMG classification

Verdict is Likely_benign. Variant got -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.029162943).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
KRT23	NM_015515.5	c.907A>T	p.Thr303Ser	missense_variant	6/9	ENST00000209718.8	NP_056330.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
KRT23	ENST00000209718.8	c.907A>T	p.Thr303Ser	missense_variant	6/9	1	NM_015515.5	ENSP00000209718.3

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome Cov.: 54

GnomAD4 genome Cov.: 31

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.12
BayesDel_addAF	Benign	-0.20	T
BayesDel_noAF	Benign	-0.52
CADD	Benign	9.6
DANN	Benign	0.77
DEOGEN2	Benign	0.14	T;.
Eigen	Benign	-1.4
Eigen_PC	Benign	-1.2
FATHMM_MKL	Benign	0.42	N
LIST_S2	Benign	0.56	T;T
M_CAP	Benign	0.037	D
MetaRNN	Benign	0.029	T;T
MetaSVM	Benign	-0.75	T
MutationAssessor	Benign	-0.98	N;.
PrimateAI	Benign	0.29	T
PROVEAN	Benign	1.3	N;N
REVEL	Benign	0.14
Sift	Benign	1.0	T;T
Sift4G	Benign	1.0	T;T
Polyphen		0.0	B;.
Vest4		0.022
MutPred		0.42		Gain of disorder (P = 0.066);.;
MVP		0.25
MPC		0.12
ClinPred		0.19	T
GERP RS		-1.5
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.038
gMVP		0.20

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: rs9257; hg19: chr17-39084504;