chr17-48728472-G-T

Position:

• chr17-48728472-G-T

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 4P and 2B. PM1 PM2 BP4_Moderate

The NM_006361.6(HOXB13):​c.122C>A​(p.Thr41Lys) variant causes a missense change. The variant allele was found at a frequency of 0.00000137 in 1,460,878 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 13/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. T41M) has been classified as Benign.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: HOXB13 NM_006361.6 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:2
• Conservation: PhyloP100: 3.79

Genes affected

HOXB13 (HGNC:5112): (homeobox B13) This gene encodes a transcription factor that belongs to the homeobox gene family. Genes of this family are highly conserved among vertebrates and essential for vertebrate embryonic development. This gene has been implicated to play a role in fetal skin development and cutaneous regeneration. In mice, a similar gene was shown to exhibit temporal and spatial colinearity in the main body axis of the embryo, but was not expressed in the secondary axes, which suggests functions in body patterning along the axis. This gene and other HOXB genes form a gene cluster at chromosome the 17q21-22 region. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

• PM1: In a chain Homeobox protein Hox-B13 (size 283) in uniprot entity HXB13_HUMAN there are 5 pathogenic changes around while only 2 benign (71%) in NM_006361.6
• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.19807017).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
HOXB13	NM_006361.6	c.122C>A	p.Thr41Lys	missense_variant	1/2	ENST00000290295.8	NP_006352.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
HOXB13	ENST00000290295.8	c.122C>A	p.Thr41Lys	missense_variant	1/2	1	NM_006361.6	ENSP00000290295	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD3 exomes AF: 0.00000401 AC: 1 AN: 249102 Hom.: 0 AF XY: 0.00000740 AC XY: 1 AN XY: 135156

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.0000327

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000137 AC: 2 AN: 1460878 Hom.: 0 Cov.: 33 AF XY: 0.00000275 AC XY: 2 AN XY: 726748

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: 0.0000232

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, single submitter

Submissions by phenotype

Prostate cancer, hereditary, 1 Uncertain:1

Uncertain significance, no assertion criteria provided

clinical testing

Laboratory of Virology, Microbiology, Quality and Medical Biotechnologies, Faculty of Sciences and Techniques - Mohammedia, Hassan II University of Casablanca

-

- -

not provided Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Oct 28, 2020

In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. Algorithms developed to predict the effect of missense changes on protein structure and function (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be tolerated, but these predictions have not been confirmed by published functional studies and their clinical significance is uncertain. This variant has not been reported in the literature in individuals with HOXB13-related conditions. This variant is not present in population databases (ExAC no frequency). This sequence change replaces threonine with lysine at codon 41 of the HOXB13 protein (p.Thr41Lys). The threonine residue is weakly conserved and there is a moderate physicochemical difference between threonine and lysine. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.17
BayesDel_addAF	Benign	-0.064	T
BayesDel_noAF	Benign	-0.23
CADD	Benign	22
DANN	Uncertain	0.98
DEOGEN2	Benign	0.13	T
Eigen	Benign	-0.036
Eigen_PC	Benign	0.14
FATHMM_MKL	Uncertain	0.96	D
LIST_S2	Benign	0.41	T
M_CAP	Uncertain	0.099	D
MetaRNN	Benign	0.20	T
MetaSVM	Uncertain	-0.086	T
MutationAssessor	Benign	1.4	L
MutationTaster	Benign	0.95	D
PrimateAI	Benign	0.47	T
PROVEAN	Benign	-0.41	N
REVEL	Benign	0.29
Sift	Benign	0.046	D
Sift4G	Benign	0.38	T
Polyphen		0.080	B
Vest4		0.22
MutPred		0.29		Gain of ubiquitination at T41 (P = 0.0075);
MVP		0.92
MPC		0.57
ClinPred		0.51	D
GERP RS		4.9
Varity_R		0.26
gMVP		0.32

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: rs199799743; hg19: chr17-46805834;