NM_006735.4:c.670G>T

Variant names:

• chr7-27101187-C-A
• rs1554334301
• NM_006735.4:c.670G>T
• HOXA2 p.Glu224*

Variant summary

Our verdict is Likely pathogenic. The variant received 7 ACMG points: 7P and 0B. PVS1_Strong PM2 PP5

The NM_006735.4(HOXA2):​c.670G>T​(p.Glu224*) variant causes a stop gained change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Pathogenic (no stars).

• Frequency: Genomes: not found (cov: 33)
• Consequence: HOXA2 NM_006735.4 stop_gained
• Clinical Significance: Pathogenic no assertion criteria provided P:1
• Conservation: PhyloP100: 4.53
• Publications: 1 publications found

Genes affected

HOXA2 (HGNC:5103): (homeobox A2) In vertebrates, the genes encoding the class of transcription factors called homeobox genes are found in clusters named A, B, C, and D on four separate chromosomes. Expression of these proteins is spatially and temporally regulated during embryonic development. This gene is part of the A cluster on chromosome 7 and encodes a DNA-binding transcription factor which may regulate gene expression, morphogenesis, and differentiation. The encoded protein may be involved in the placement of hindbrain segments in the proper location along the anterior-posterior axis during development. [provided by RefSeq, Jul 2008]

HOXA2 Gene-Disease associations (from GenCC):

• bilateral microtia-deafness-cleft palate syndrome

  Inheritance: AD, AR, SD Classification: STRONG, MODERATE, SUPPORTIVE, LIMITED Submitted by: Ambry Genetics, Laboratory for Molecular Medicine, Labcorp Genetics (formerly Invitae), Orphanet
• microtia

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

ENSG00000293629 (HGNC:):

ACMG classification

Our verdict: Likely_pathogenic. The variant received 7 ACMG points.

• PVS1: Loss of function variant, product does not undergo nonsense mediated mRNA decay. Variant is located in the 3'-most exon, not predicted to undergo nonsense mediated mRNA decay. Fraction of 0.408 CDS is truncated, and there are 3 pathogenic variants in the truncated region.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 7-27101187-C-A is Pathogenic according to our data. Variant chr7-27101187-C-A is described in ClinVar as Pathogenic. ClinVar VariationId is 522589.Status of the report is no_assertion_criteria_provided, 0 stars.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_006735.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	HOXA2	NM_006735.4	MANE Select	c.670G>T	p.Glu224*	stop_gained	Exon 2 of 2	NP_006726.1	O43364

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	HOXA2	ENST00000222718.7	TSL:1 MANE Select	c.670G>T	p.Glu224*	stop_gained	Exon 2 of 2	ENSP00000222718.5	O43364
	HOXA2	ENST00000612779.1	TSL:6	n.1500G>T		non_coding_transcript_exon	Exon 1 of 1
	ENSG00000293629	ENST00000716605.1		n.310+4799C>A		intron	N/A

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 33

ClinVar

ClinVar submissions

Significance: Pathogenic

Revision: no assertion criteria provided

Pathogenic	VUS	Benign	Condition
1	-	-	MICROTIA WITHOUT HEARING IMPAIRMENT (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.60	D
BayesDel_noAF	Pathogenic	0.60
CADD	Pathogenic	37
DANN	Uncertain	1.0
Eigen	Pathogenic	1.0
Eigen_PC	Pathogenic	0.90
FATHMM_MKL	Pathogenic	0.99	D
PhyloP100		4.5
Mutation Taster		=44/156	disease causing (ClinVar)

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

MaxEntScan Visualizer can be used to analyze the impact of this mutation on the neighboring sequence.

Other links and lift over

dbSNP: rs1554334301;

hg19: chr7-27140806;