chrX-108157173-C-T

Variant names:

• chrX-108157173-C-T
• rs776799928
• NM_033641.4:c.4900G>A

Variant summary

Our verdict is Likely benign. The variant received -4 ACMG points: 0P and 4B. BS2

The NM_033641.4(COL4A6):​c.4900G>A​(p.Glu1634Lys) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000019 in 1,210,414 control chromosomes in the GnomAD database, with no homozygous occurrence. There are 5 hemizygotes in GnomAD. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: 𝑓 0.0000089 (0 hom., 0 hem., cov: 23)
  • Exomes 𝑓: 0.000020 (0 hom. 5 hem.)
• Consequence: COL4A6 NM_033641.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 7.91
• Publications: 0 publications found

Genes affected

COL4A6 (HGNC:2208): (collagen type IV alpha 6 chain) This gene encodes one of the six subunits of type IV collagen, the major structural component of basement membranes. Like the other members of the type IV collagen gene family, this gene is organized in a head-to-head conformation with another type IV collagen gene, alpha 5 type IV collagen, so that the gene pair shares a common promoter. Deletions in the alpha 5 gene that extend into the alpha 6 gene result in diffuse leiomyomatosis accompanying the X-linked Alport syndrome caused by the deletion in the alpha 5 gene. Alternative splicing results in multiple transcript variants encoding different isoforms. [provided by RefSeq, Dec 2013]

COL4A6 Gene-Disease associations (from GenCC):

• hearing loss, X-linked 6

  Inheritance: XL Classification: STRONG, LIMITED Submitted by: Labcorp Genetics (formerly Invitae), Ambry Genetics, ClinGen
• X-linked nonsyndromic hearing loss

  Inheritance: XL Classification: SUPPORTIVE Submitted by: Orphanet
• premature ovarian failure 1

  Inheritance: XL Classification: LIMITED Submitted by: Ambry Genetics

ACMG classification

Our verdict: Likely_benign. The variant received -4 ACMG points.

• BS2: High Hemizygotes in GnomAdExome4 at 5 XL gene

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_033641.4. 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
	COL4A6	NM_033641.4	MANE Select	c.4900G>A	p.Glu1634Lys	missense	Exon 45 of 45	NP_378667.1	Q14031-2
	COL4A6	NM_001287758.2		c.4951G>A	p.Glu1651Lys	missense	Exon 46 of 46	NP_001274687.1	A8MXH5
	COL4A6	NM_001847.4		c.4903G>A	p.Glu1635Lys	missense	Exon 45 of 45	NP_001838.2	Q14031-1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	COL4A6	ENST00000334504.12	TSL:5 MANE Select	c.4900G>A	p.Glu1634Lys	missense	Exon 45 of 45	ENSP00000334733.7	Q14031-2
	COL4A6	ENST00000372216.8	TSL:1	c.4903G>A	p.Glu1635Lys	missense	Exon 45 of 45	ENSP00000361290.4	Q14031-1
	COL4A6	ENST00000621266.4	TSL:1	c.4828G>A	p.Glu1610Lys	missense	Exon 44 of 44	ENSP00000482970.1	A0A087WZY5

Frequencies

GnomAD3 genomes AF: 0.00000891 AC: 1 AN: 112206 Hom.: 0 Cov.: 23

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000188

Gnomad OTH AF: 0.00

GnomAD2 exomes AF: 0.00000546 AC: 1 AN: 183285 AF XY: 0.0000148

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 FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.0000200 AC: 22 AN: 1098208 Hom.: 0 Cov.: 31 AF XY: 0.0000138 AC XY: 5 AN XY: 363572

African (AFR) AF: 0.00 AC: 0 AN: 26402

American (AMR) AF: 0.00 AC: 0 AN: 35204

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 19386

East Asian (EAS) AF: 0.0000993 AC: 3 AN: 30204

South Asian (SAS) AF: 0.0000185 AC: 1 AN: 54144

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 40521

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 4137

European-Non Finnish (NFE) AF: 0.0000178 AC: 15 AN: 842116

Other (OTH) AF: 0.0000651 AC: 3 AN: 46094

GnomAD4 genome AF: 0.00000891 AC: 1 AN: 112206 Hom.: 0 Cov.: 23 AF XY: 0.00 AC XY: 0 AN XY: 34346

African (AFR) AF: 0.00 AC: 0 AN: 30871

American (AMR) AF: 0.00 AC: 0 AN: 10624

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 2652

East Asian (EAS) AF: 0.00 AC: 0 AN: 3568

South Asian (SAS) AF: 0.00 AC: 0 AN: 2675

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 6193

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 235

European-Non Finnish (NFE) AF: 0.0000188 AC: 1 AN: 53196

Other (OTH) AF: 0.00 AC: 0 AN: 1506

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.0000227

ExAC AF: 0.0000165 AC: 2

ClinVar

ClinVar submissions

Significance: Uncertain significance

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
-	1	-	not provided (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.95
BayesDel_addAF	Pathogenic	0.57	D
BayesDel_noAF	Pathogenic	0.74
CADD	Uncertain	25
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.83	D
FATHMM_MKL	Pathogenic	1.0	D
LIST_S2	Pathogenic	0.99	D
M_CAP	Pathogenic	0.55	D
MetaRNN	Uncertain	0.61	D
MetaSVM	Pathogenic	1.1	D
MutationAssessor	Pathogenic	3.6	H
PhyloP100		7.9
PrimateAI	Pathogenic	0.80	T
PROVEAN	Uncertain	-3.9	D
REVEL	Pathogenic	0.93
Sift	Pathogenic	0.0	D
Sift4G	Pathogenic	0.0	D
Polyphen		1.0	D
Vest4		0.68
MutPred		0.76		Gain of methylation at E1635 (P = 0.0134)
MVP		0.99
MPC		0.31
ClinPred		0.97	D
GERP RS		5.0
Varity_R		0.78
gMVP		0.96
Mutation Taster		=74/26	polymorphism

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: rs776799928; hg19: chrX-107400403;