chr2-176123435-G-A

Position:

• chr2-176123435-G-A

Variant summary

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

The NM_014213.4(HOXD9):​c.667G>A​(p.Gly223Arg) 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. 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: 0.0 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: HOXD9 NM_014213.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.757

Genes affected

HOXD9 (HGNC:5140): (homeobox D9) This gene belongs to the homeobox family of genes. The homeobox genes encode a highly conserved family of transcription factors that play an important role in morphogenesis in all multicellular organisms. Mammals possess four similar homeobox gene clusters, HOXA, HOXB, HOXC and HOXD, located on different chromosomes, consisting of 9 to 11 genes arranged in tandem. This gene is one of several homeobox HOXD genes located at 2q31-2q37 chromosome regions. Deletions that removed the entire HOXD gene cluster or 5' end of this cluster have been associated with severe limb and genital abnormalities. The exact role of this gene has not been determined. [provided by RefSeq, Jul 2008]

HOXD-AS2 (HGNC:43756): (HOXD cluster antisense RNA 2)

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=0.28279066).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
HOXD9	NM_014213.4	c.667G>A	p.Gly223Arg	missense_variant	1/2	ENST00000249499.8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
HOXD9	ENST00000249499.8	c.667G>A	p.Gly223Arg	missense_variant	1/2	1	NM_014213.4	P1
HOXD-AS2	ENST00000440016.6	n.498-991C>T		intron_variant, non_coding_transcript_variant		5

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Data not reliable, filtered out with message: AC0 AF: 0.00 AC: 0 AN: 1412154 Hom.: 0 Cov.: 34 AF XY: 0.00 AC XY: 0 AN XY: 697990

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: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

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

Jan 22, 2024

The c.667G>A (p.G223R) alteration is located in exon 1 (coding exon 1) of the HOXD9 gene. This alteration results from a G to A substitution at nucleotide position 667, causing the glycine (G) at amino acid position 223 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	Benign	0.15
BayesDel_addAF	Benign	-0.23	T
BayesDel_noAF	Benign	-0.090
CADD	Benign	16
DANN	Uncertain	0.98
DEOGEN2	Benign	0.077	T
Eigen	Benign	-0.16
Eigen_PC	Benign	-0.15
FATHMM_MKL	Benign	0.45	N
LIST_S2	Benign	0.46	T
M_CAP	Pathogenic	0.29	D
MetaRNN	Benign	0.28	T
MetaSVM	Uncertain	-0.21	T
MutationAssessor	Benign	1.8	L
MutationTaster	Benign	1.0	N
PrimateAI	Uncertain	0.75	T
PROVEAN	Benign	-1.3	N
REVEL	Uncertain	0.41
Sift	Benign	0.087	T
Sift4G	Benign	0.25	T
Polyphen		0.84	P
Vest4		0.24
MutPred		0.40		Gain of solvent accessibility (P = 0.0037);
MVP		0.94
MPC		0.64
ClinPred		0.33	T
GERP RS		3.8
Varity_R		0.062
gMVP		0.39

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.080		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: rs899771804; hg19: chr2-176988163;