3-99789924-T-G

Variant names:

• chr3-99789924-T-G
• rs793494
• NM_020351.4:c.-3-756T>G

Variant summary

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

The NM_020351.4(COL8A1):​c.-3-756T>G variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. 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: 32)
• Consequence: COL8A1 NM_020351.4 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.317
• Publications: 7 publications found

Genes affected

COL8A1 (HGNC:2215): (collagen type VIII alpha 1 chain) This gene encodes one of the two alpha chains of type VIII collagen. The gene product is a short chain collagen and a major component of the basement membrane of the corneal endothelium. The type VIII collagen fibril can be either a homo- or a heterotrimer. Alternatively spliced transcript variants encoding the same protein have been observed. [provided by RefSeq, Dec 2011]

ENSG00000296790 (HGNC:):

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=-0.84).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_020351.4. 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
	COL8A1	NM_020351.4	MANE Select	c.-3-756T>G		intron	N/A	NP_065084.2
	COL8A1	NM_001850.5		c.-3-756T>G		intron	N/A	NP_001841.2

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	COL8A1	ENST00000652472.1	MANE Select	c.-3-756T>G		intron	N/A	ENSP00000498483.1	P27658
	COL8A1	ENST00000261037.7	TSL:1	c.-3-756T>G		intron	N/A	ENSP00000261037.3	P27658
	COL8A1	ENST00000895775.1		c.-759T>G		5_prime_UTR_premature_start_codon_gain	Exon 1 of 2	ENSP00000565834.1

Frequencies

GnomAD3 genomes Cov.: 32

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.84
CADD	Benign	1.7
DANN	Benign	0.59
PhyloP100		-0.32

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: rs793494; hg19: chr3-99508768;