21-44558223-C-T

Position:

• chr21-44558223-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 2P and 1B. PM2 BP4

The NM_198696.3(KRTAP10-3):​c.493G>A​(p.Val165Met) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000099 in 1,414,746 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 12/21 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: 0.0000099 (0 hom.)
• Consequence: KRTAP10-3 NM_198696.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: -0.103

Genes affected

KRTAP10-3 (HGNC:22968): (keratin associated protein 10-3) This gene encodes a member of the keratin-associated protein (KAP) family. The KAP proteins form a matrix of keratin intermediate filaments which contribute to the structure of hair fibers. KAP family members appear to have unique, family-specific amino- and carboxyl-terminal regions and are subdivided into three multi-gene families according to amino acid composition: the high sulfur, the ultrahigh sulfur, and the high tyrosine/glycine KAPs. This gene encodes a member of the high sulfur KAP family. It is localized to a cluster of intronless KAPs at 21q22.3 which are located within the introns of the C21orf29 gene. [provided by RefSeq, Jul 2008]

TSPEAR (HGNC:1268): (thrombospondin type laminin G domain and EAR repeats) This gene encodes a protein that contains a N-terminal thrombospondin-type laminin G domain and several tandem arranged epilepsy-associated repeats (EARs). A mutation in this gene is the cause of autosomal recessive deafness-98. Alternate splicing results in multiple transcript variants. [provided by RefSeq, Dec 2012]

TSPEAR (HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.287138).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
KRTAP10-3	NM_198696.3	c.493G>A	p.Val165Met	missense_variant	1/1	ENST00000391620.2	NP_941969.2
TSPEAR	NM_144991.3	c.303+9562G>A		intron_variant		ENST00000323084.9	NP_659428.2
TSPEAR	NM_001272037.2	c.99+9562G>A		intron_variant			NP_001258966.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
KRTAP10-3	ENST00000391620.2	c.493G>A	p.Val165Met	missense_variant	1/1	6	NM_198696.3	ENSP00000375478.1
TSPEAR	ENST00000323084.9	c.303+9562G>A		intron_variant		1	NM_144991.3	ENSP00000321987.4
TSPEAR	ENST00000397916.1	n.258+9562G>A		intron_variant		1
TSPEAR	ENST00000642437.1	n.*248+9562G>A		intron_variant				ENSP00000496535.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD3 exomes AF: 0.0000120 AC: 3 AN: 250824 Hom.: 0 AF XY: 0.0000221 AC XY: 3 AN XY: 135616

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.0000548

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000176

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000990 AC: 14 AN: 1414746 Hom.: 0 Cov.: 189 AF XY: 0.00000994 AC XY: 7 AN XY: 704328

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.0000262

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.0000121

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

Bravo AF: 0.0000151

ExAC AF: 0.00000824 AC: 1

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

May 17, 2023

The c.493G>A (p.V165M) alteration is located in exon 1 (coding exon 1) of the KRTAP10-3 gene. This alteration results from a G to A substitution at nucleotide position 493, causing the valine (V) at amino acid position 165 to be replaced by a methionine (M). 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	0.13
BayesDel_addAF	Benign	-0.30	T
BayesDel_noAF	Benign	-0.50
CADD	Benign	19
DANN	Uncertain	0.98
DEOGEN2	Benign	0.080	T
Eigen	Benign	0.13
Eigen_PC	Benign	-0.080
FATHMM_MKL	Benign	0.040	N
LIST_S2	Benign	0.40	T
M_CAP	Benign	0.0035	T
MetaRNN	Benign	0.29	T
MetaSVM	Benign	-1.1	T
MutationAssessor	Uncertain	2.6	M
PrimateAI	Benign	0.28	T
PROVEAN	Uncertain	-2.8	D
REVEL	Benign	0.078
Sift	Benign	0.047	D
Sift4G	Benign	0.078	T
Polyphen		1.0	D
Vest4		0.19
MVP		0.35
MPC		0.023
ClinPred		0.46	T
GERP RS		2.5
Varity_R		0.12
gMVP		0.031

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.030		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: rs782807699; hg19: chr21-45978106;