rs79359215

chr13-110213762-T-A

Variant summary

Our verdict is Benign. Variant got -20 ACMG points: 0P and 20B. BP4_Strong BP6_Very_Strong BS1 BS2

The NM_001845.6(COL4A1):c.279+20A>T variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00188 in 1,613,532 control chromosomes in the GnomAD database, including 39 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★).

• Frequency:
  • Genomes: 𝑓 0.010 (17 hom., cov: 32)
  • Exomes 𝑓: 0.0010 (22 hom.)
• Consequence: COL4A1 NM_001845.6 intron
• Clinical Significance: Benign/Likely benign criteria provided, multiple submitters, no conflicts B:5
• Conservation: PhyloP100: -0.637

Genes affected

COL4A1 (HGNC:2202): (collagen type IV alpha 1 chain) This gene encodes a type IV collagen alpha protein. Type IV collagen proteins are integral components of basement membranes. This gene shares a bidirectional promoter with a paralogous gene on the opposite strand. The protein consists of an amino-terminal 7S domain, a triple-helix forming collagenous domain, and a carboxy-terminal non-collagenous domain. It functions as part of a heterotrimer and interacts with other extracellular matrix components such as perlecans, proteoglycans, and laminins. In addition, proteolytic cleavage of the non-collagenous carboxy-terminal domain results in a biologically active fragment known as arresten, which has anti-angiogenic and tumor suppressor properties. Mutations in this gene cause porencephaly, cerebrovascular disease, and renal and muscular defects. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Dec 2014]

ACMG classification

Verdict is Benign. Variant got -20 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.89).
• BP6: Variant 13-110213762-T-A is Benign according to our data. Variant chr13-110213762-T-A is described in ClinVar as [Likely_benign]. Clinvar id is 445331.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr13-110213762-T-A is described in Lovd as [Benign]. Variant chr13-110213762-T-A is described in Lovd as [Likely_benign].
• BS1: Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.0101 (1538/152312) while in subpopulation AFR AF= 0.0342 (1422/41552). AF 95% confidence interval is 0.0327. There are 17 homozygotes in gnomad4. There are 745 alleles in male gnomad4 subpopulation. This position pass quality control queck.
• BS2: High AC in GnomAd at 1530 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
COL4A1	NM_001845.6	c.279+20A>T		intron_variant		ENST00000375820.10
COL4A1	NM_001303110.2	c.279+20A>T		intron_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
COL4A1	ENST00000375820.10	c.279+20A>T		intron_variant		1	NM_001845.6	P1

Frequencies

GnomAD3 genomes AF: 0.0101 AC: 1530 AN: 152194 Hom.: 17 Cov.: 32

Gnomad AFR AF: 0.0341

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00583

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00316

Gnomad NFE AF: 0.000235

Gnomad OTH AF: 0.00478

GnomAD3 exomes AF: 0.00261 AC: 657 AN: 251434 Hom.: 10 AF XY: 0.00194 AC XY: 263 AN XY: 135898

Gnomad AFR exome AF: 0.0341

Gnomad AMR exome AF: 0.00231

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.0000653

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000528

Gnomad OTH exome AF: 0.00228

GnomAD4 exome AF: 0.00102 AC: 1491 AN: 1461220 Hom.: 22 Cov.: 32 AF XY: 0.000905 AC XY: 658 AN XY: 726964

Gnomad4 AFR exome AF: 0.0345

Gnomad4 AMR exome AF: 0.00248

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000580

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.0000477

Gnomad4 OTH exome AF: 0.00267

GnomAD4 genome AF: 0.0101 AC: 1538 AN: 152312 Hom.: 17 Cov.: 32 AF XY: 0.0100 AC XY: 745 AN XY: 74496

Gnomad4 AFR AF: 0.0342

Gnomad4 AMR AF: 0.00582

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.000235

Gnomad4 OTH AF: 0.00473

Alfa AF: 0.00528 Hom.: 3

Bravo AF: 0.0114

Asia WGS AF: 0.00202 AC: 7 AN: 3478

ClinVar

Significance: Benign/Likely benign

Submissions summary: Benign:5

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Benign:4

Benign, criteria provided, single submitter	clinical testing	Invitae	Jan 25, 2024	- -
Benign, criteria provided, single submitter	clinical testing	Center for Pediatric Genomic Medicine, Children's Mercy Hospital and Clinics	Jun 16, 2017	- -
Likely benign, criteria provided, single submitter	clinical testing	GeneDx	Jul 14, 2018	- -
Likely benign, no assertion criteria provided	clinical testing	Laboratory of Diagnostic Genome Analysis, Leiden University Medical Center (LUMC)	-	- -

not specified Benign:1

Benign, no assertion criteria provided

clinical testing

Clinical Genetics DNA and cytogenetics Diagnostics Lab, Erasmus MC, Erasmus Medical Center

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Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.89
Cadd	Benign	0.30
Dann	Benign	0.62

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

Publications

LitVar

Other links and lift over

dbSNP: rs79359215; hg19: chr13-110866109;