17-48550606-C-T

Variant summary

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

The NM_001384749.1(HOXB3):c.1024G>A(p.Gly342Arg) variant causes a missense change. The variant allele was found at a frequency of 0.00000219 in 1,368,580 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000022 (0 hom.)
• Consequence: HOXB3 NM_001384749.1 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 4.54

Genes affected

HOXB3 (HGNC:5114): (homeobox B3) This gene is a member of the Antp homeobox family and encodes a nuclear protein with a homeobox DNA-binding domain. It is included in a cluster of homeobox B genes located on chromosome 17. The encoded protein functions as a sequence-specific transcription factor that is involved in development. Increased expression of this gene is associated with a distinct biologic subset of acute myeloid leukemia (AML). [provided by RefSeq, Jul 2008]

HOXB-AS1 (HGNC:43744): (HOXB cluster antisense RNA 1)

HOXB-AS3 (HGNC:40283): (HOXB cluster antisense RNA 3)

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
HOXB3	NM_001384749.1	c.1024G>A	p.Gly342Arg	missense_variant	5/5	ENST00000498678.6
HOXB-AS1	NR_102279.1	n.579+204C>T		intron_variant, non_coding_transcript_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
HOXB3	ENST00000498678.6	c.1024G>A	p.Gly342Arg	missense_variant	5/5	2	NM_001384749.1	P1
HOXB-AS1	ENST00000435312.5	n.579+204C>T		intron_variant, non_coding_transcript_variant		5
HOXB-AS3	ENST00000465846.6	n.77+660C>T		intron_variant, non_coding_transcript_variant		3

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000219 AC: 3 AN: 1368580 Hom.: 0 Cov.: 32 AF XY: 0.00000149 AC XY: 1 AN XY: 672392

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.0000257

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000187

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

Bravo AF: 0.00000378

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

Dec 18, 2023

The c.1024G>A (p.G342R) alteration is located in exon 4 (coding exon 2) of the HOXB3 gene. This alteration results from a G to A substitution at nucleotide position 1024, causing the glycine (G) at amino acid position 342 to be replaced by an arginine (R). 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	Pathogenic	0.58
BayesDel_addAF	Pathogenic	0.30	D
BayesDel_noAF	Pathogenic	0.20
Cadd	Pathogenic	28
Dann	Uncertain	0.99
DEOGEN2	Uncertain	0.64	D;.;D;D;T;.;.;D
Eigen	Uncertain	0.52
Eigen_PC	Uncertain	0.46
FATHMM_MKL	Uncertain	0.91	D
M_CAP	Pathogenic	0.54	D
MetaRNN	Uncertain	0.55	D;D;D;D;D;D;D;D
MetaSVM	Pathogenic	0.82	D
MutationAssessor	Uncertain	2.2	M;.;M;M;.;.;.;M
MutationTaster	Benign	1.0	D;D;D;D;D;D;D;D;D;D
PrimateAI	Pathogenic	0.87	D
PROVEAN	Pathogenic	-5.3	D;D;D;D;D;D;D;D
REVEL	Pathogenic	0.71
Sift	Uncertain	0.0010	D;D;D;D;D;D;D;D
Sift4G	Uncertain	0.0030	D;D;D;D;D;D;D;D
Polyphen		0.98	D;.;D;D;.;.;.;D
Vest4		0.52
MutPred		0.18		Gain of catalytic residue at G342 (P = 0.0511);.;Gain of catalytic residue at G342 (P = 0.0511);Gain of catalytic residue at G342 (P = 0.0511);.;.;.;Gain of catalytic residue at G342 (P = 0.0511);
MVP		0.93
MPC		1.1
ClinPred		0.99	D
GERP RS		3.8
Varity_R		0.82
gMVP		0.76

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: rs2068688919; hg19: chr17-46627968;