chrX-11120988-G-A

Variant names:

• chrX-11120988-G-A
• rs2045487420
• NM_005333.5:c.603G>A

Variant summary

Our verdict is Likely pathogenic. The variant received 8 ACMG points: 8P and 0B. PVS1_Strong PM2 PP5_Moderate

The NM_005333.5(HCCS):​c.603G>A​(p.Trp201*) variant causes a stop gained change involving the alteration of a conserved nucleotide. 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 Likely pathogenic (★).

• Frequency: Genomes: not found (cov: 24)
• Consequence: HCCS NM_005333.5 stop_gained
• Clinical Significance: Likely pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 9.25
• Publications: 0 publications found

Genes affected

HCCS (HGNC:4837): (holocytochrome c synthase) The protein encoded by this gene is an enzyme that covalently links a heme group to the apoprotein of cytochrome c. Defects in this gene are a cause of microphthalmia syndromic type 7 (MCOPS7). Three transcript variants encoding the same protein have been found for this gene. [provided by RefSeq, Jan 2010]

ARHGAP6 (HGNC:676): (Rho GTPase activating protein 6) This gene encodes a member of the rhoGAP family of proteins which play a role in the regulation of actin polymerization at the plasma membrane during several cellular processes. This protein is thought to have two independent functions, one as a GTPase-activating protein with specificity for RhoA, and another as a cytoskeletal protein that promotes actin remodeling. Multiple alternatively spliced transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Jul 2008]

ACMG classification

Our verdict: Likely_pathogenic. The variant received 8 ACMG points.

• PVS1: Loss of function variant, product does not undergo nonsense mediated mRNA decay. Variant is located in the 3'-most 50 bp of the penultimate exon, not predicted to undergo nonsense mediated mRNA decay. There are 5 pathogenic variants in the truncated region.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant X-11120988-G-A is Pathogenic according to our data. Variant chrX-11120988-G-A is described in ClinVar as Likely_pathogenic. ClinVar VariationId is 3390916.Status of the report is criteria_provided_single_submitter, 1 stars.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_005333.5. 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
	HCCS	NM_005333.5	MANE Select	c.603G>A	p.Trp201*	stop_gained	Exon 6 of 7	NP_005324.3	P53701
	HCCS	NM_001122608.3		c.603G>A	p.Trp201*	stop_gained	Exon 6 of 7	NP_001116080.1	P53701
	HCCS	NM_001171991.3		c.603G>A	p.Trp201*	stop_gained	Exon 6 of 7	NP_001165462.1	P53701

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	HCCS	ENST00000380762.5	TSL:1 MANE Select	c.603G>A	p.Trp201*	stop_gained	Exon 6 of 7	ENSP00000370139.4	P53701
	HCCS	ENST00000380763.7	TSL:1	c.603G>A	p.Trp201*	stop_gained	Exon 6 of 7	ENSP00000370140.3	P53701
	HCCS	ENST00000321143.8	TSL:2	c.603G>A	p.Trp201*	stop_gained	Exon 6 of 7	ENSP00000326579.4	P53701

Frequencies

GnomAD3 genomes Cov.: 24

GnomAD4 exome Cov.: 28

GnomAD4 genome Cov.: 24

Alfa AF: 0.00 Hom.: 0

ClinVar

ClinVar submissions as Germline

Significance: Likely pathogenic

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
1	-	-	Linear skin defects with multiple congenital anomalies 1 (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.71	D
BayesDel_noAF	Pathogenic	0.65
CADD	Pathogenic	38
DANN	Uncertain	1.0
FATHMM_MKL	Pathogenic	0.99	D
PhyloP100		9.2
Vest4		0.87
GERP RS		5.9
Mutation Taster		=4/196	disease causing

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

Other links and lift over

dbSNP: rs2045487420; hg19: chrX-11139108;