X-108621793-T-C

Variant names:

• chrX-108621793-T-C
• rs104886360
• NM_033380.3:c.2678-10T>C

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_033380.3(COL4A5):​c.2678-10T>C variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000938 in 1,065,904 control chromosomes in the GnomAD database, with no homozygous occurrence. There are no hemizygote samples in GnomAD. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: not found (cov: 22)
  • Exomes 𝑓: 9.4e-7 (0 hom. 0 hem.)
• Consequence: COL4A5 NM_033380.3 intron
• Scores: Splicing: ADA: 0.006107
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 1.15
• Publications: 0 publications found

Genes affected

COL4A5 (HGNC:2207): (collagen type IV alpha 5 chain) This gene encodes one of the six subunits of type IV collagen, the major structural component of basement membranes. Mutations in this gene are associated with X-linked Alport syndrome, also known as hereditary nephritis. 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 so that each gene pair shares a common promoter. Alternatively spliced transcript variants have been identified for this gene. [provided by RefSeq, Aug 2010]

COL4A5 Gene-Disease associations (from GenCC):

• Alport syndrome

  Inheritance: XL Classification: DEFINITIVE Submitted by: ClinGen, G2P
• X-linked Alport syndrome

  Inheritance: XL Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: PanelApp Australia, Genomics England PanelApp, Myriad Women’s Health, Orphanet, Labcorp Genetics (formerly Invitae)

ACMG classification

Our verdict: Likely_benign. The variant received -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.65).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
COL4A5	NM_033380.3	c.2678-10T>C		intron_variant	Intron 31 of 52	ENST00000328300.11	NP_203699.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
COL4A5	ENST00000328300.11	c.2678-10T>C		intron_variant	Intron 31 of 52	1	NM_033380.3	ENSP00000331902.7
COL4A5	ENST00000483338.1	c.1502-10T>C		intron_variant	Intron 15 of 19	1		ENSP00000495685.1
COL4A5	ENST00000361603.7	c.2678-10T>C		intron_variant	Intron 31 of 50	2		ENSP00000354505.2

Frequencies

GnomAD3 genomes Cov.: 22

GnomAD4 exome AF: 9.38e-7 AC: 1 AN: 1065904 Hom.: 0 Cov.: 25 AF XY: 0.00 AC XY: 0 AN XY: 336196

African (AFR) AF: 0.00 AC: 0 AN: 25802

American (AMR) AF: 0.00 AC: 0 AN: 35103

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 19141

East Asian (EAS) AF: 0.00 AC: 0 AN: 30055

South Asian (SAS) AF: 0.00 AC: 0 AN: 52961

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 40440

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 4045

European-Non Finnish (NFE) AF: 0.00000123 AC: 1 AN: 813345

Other (OTH) AF: 0.00 AC: 0 AN: 45012

GnomAD4 genome Cov.: 22

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.65
CADD	Benign	15
DANN	Benign	0.91
PhyloP100		1.1

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Benign	0.0061
dbscSNV1_RF	Benign	0.16
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

Other links and lift over

dbSNP: rs104886360; hg19: chrX-107865023;