4-108959574-A-G

Variant names:

• chr4-108959574-A-G
• rs17039583
• NM_198721.4:c.492+14793T>C

Variant summary

Our verdict is Benign. The variant received -12 ACMG points: 0P and 12B. BP4_Strong BA1

The NM_198721.4(COL25A1):​c.492+14793T>C variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0723 in 152,120 control chromosomes in the GnomAD database, including 423 homozygotes. 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: 𝑓 0.072 (423 hom., cov: 34)
• Consequence: COL25A1 NM_198721.4 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.424
• Publications: 8 publications found

Genes affected

COL25A1 (HGNC:18603): (collagen type XXV alpha 1 chain) This gene encodes a brain-specific membrane associated collagen. A product of proteolytic processing of the encoded protein, CLAC (collagenous Alzheimer amyloid plaque component), binds to amyloid beta-peptides found in Alzheimer amyloid plaques but CLAC inhibits rather than facilitates amyloid fibril elongation (PMID: 16300410). A study of over-expression of this collagen in mice, however, found changes in pathology and behavior suggesting that the encoded protein may promote amyloid plaque formation (PMID: 19548013). Multiple transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Dec 2011]

COL25A1 Gene-Disease associations (from GenCC):

• fibrosis of extraocular muscles, congenital, 5

  Inheritance: AR Classification: STRONG, MODERATE Submitted by: Labcorp Genetics (formerly Invitae), Ambry Genetics, G2P, Genomics England PanelApp
• ptosis, hereditary congenital, 1

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Benign. The variant received -12 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.52).
• BA1: GnomAd4 highest subpopulation (EAS) allele frequency at 95% confidence interval = 0.0927 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
COL25A1	NM_198721.4	c.492+14793T>C		intron_variant	Intron 8 of 37	ENST00000399132.6	NP_942014.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
COL25A1	ENST00000399132.6	c.492+14793T>C		intron_variant	Intron 8 of 37	5	NM_198721.4	ENSP00000382083.1

Frequencies

GnomAD3 genomes AF: 0.0723 AC: 10984 AN: 152002 Hom.: 424 Cov.: 34

Gnomad AFR AF: 0.0787

Gnomad AMI AF: 0.152

Gnomad AMR AF: 0.0635

Gnomad ASJ AF: 0.0475

Gnomad EAS AF: 0.100

Gnomad SAS AF: 0.0796

Gnomad FIN AF: 0.0551

Gnomad MID AF: 0.134

Gnomad NFE AF: 0.0698

Gnomad OTH AF: 0.0861

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

GnomAD4 genome AF: 0.0723 AC: 10992 AN: 152120 Hom.: 423 Cov.: 34 AF XY: 0.0721 AC XY: 5359 AN XY: 74378

African (AFR) AF: 0.0785 AC: 3262 AN: 41528

American (AMR) AF: 0.0634 AC: 969 AN: 15280

Ashkenazi Jewish (ASJ) AF: 0.0475 AC: 165 AN: 3472

East Asian (EAS) AF: 0.0998 AC: 516 AN: 5172

South Asian (SAS) AF: 0.0794 AC: 383 AN: 4822

European-Finnish (FIN) AF: 0.0551 AC: 584 AN: 10600

Middle Eastern (MID) AF: 0.137 AC: 40 AN: 292

European-Non Finnish (NFE) AF: 0.0699 AC: 4745 AN: 67930

Other (OTH) AF: 0.0895 AC: 189 AN: 2112

Alfa AF: 0.0698 Hom.: 839

Bravo AF: 0.0731

Asia WGS AF: 0.103 AC: 355 AN: 3476

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.52
CADD	Benign	14
DANN	Benign	0.84
PhyloP100		0.42
Mutation Taster		=100/0	polymorphism (auto)

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: rs17039583; hg19: chr4-109880730;