1-40300946-C-T

Position:

• chr1-40300946-C-T

Variant summary

Our verdict is Benign. Variant got -20 ACMG points: 0P and 20B. BP4_Strong BP6_Very_Strong BA1

The NM_001852.4(COL9A2):​c.*236G>A variant causes a 3 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0164 in 535,994 control chromosomes in the GnomAD database, including 623 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★★).

• Frequency:
  • Genomes: 𝑓 0.043 (453 hom., cov: 32)
  • Exomes 𝑓: 0.0060 (170 hom.)
• Consequence: COL9A2 NM_001852.4 3_prime_UTR
• Clinical Significance: Benign criteria provided, multiple submitters, no conflicts B:3
• Conservation: PhyloP100: -0.0190

Genes affected

COL9A2 (HGNC:2218): (collagen type IX alpha 2 chain) This gene encodes one of the three alpha chains of type IX collagen, the major collagen component of hyaline cartilage. Type IX collagen, a heterotrimeric molecule, is usually found in tissues containing type II collagen, a fibrillar collagen. This chain is unusual in that, unlike the other two type IX alpha chains, it contains a covalently attached glycosaminoglycan side chain. Mutations in this gene are associated with multiple epiphyseal dysplasia. [provided by RefSeq, Jul 2008]

COL9A2 (HGNC:):

ACMG classification

Verdict is Benign. Variant got -20 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.8).
• BP6: Variant 1-40300946-C-T is Benign according to our data. Variant chr1-40300946-C-T is described in ClinVar as [Benign]. Clinvar id is 297286.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• BA1: GnomAd4 highest subpopulation (AFR) allele frequency at 95% confidence interval = 0.145 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
COL9A2	NM_001852.4	c.*236G>A		3_prime_UTR_variant	32/32	ENST00000372748.8	NP_001843.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
COL9A2	ENST00000372748	c.*236G>A		3_prime_UTR_variant	32/32	1	NM_001852.4	ENSP00000361834.3
COL9A2	ENST00000482722.5	n.2609G>A		non_coding_transcript_exon_variant	31/31	1

Frequencies

GnomAD3 genomes AF: 0.0423 AC: 6440 AN: 152224 Hom.: 446 Cov.: 32

Gnomad AFR AF: 0.148

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.0153

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.000385

Gnomad SAS AF: 0.00103

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00949

Gnomad NFE AF: 0.000309

Gnomad OTH AF: 0.0239

GnomAD4 exome AF: 0.00601 AC: 2305 AN: 383652 Hom.: 170 Cov.: 3 AF XY: 0.00526 AC XY: 1051 AN XY: 199966

Gnomad4 AFR exome AF: 0.153

Gnomad4 AMR exome AF: 0.00957

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.000106

Gnomad4 SAS exome AF: 0.000937

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.000313

Gnomad4 OTH exome AF: 0.0134

GnomAD4 genome AF: 0.0425 AC: 6476 AN: 152342 Hom.: 453 Cov.: 32 AF XY: 0.0420 AC XY: 3130 AN XY: 74498

Gnomad4 AFR AF: 0.148

Gnomad4 AMR AF: 0.0153

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.000386

Gnomad4 SAS AF: 0.000827

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.000309

Gnomad4 OTH AF: 0.0269

Alfa AF: 0.0492 Hom.: 56

Bravo AF: 0.0487

Asia WGS AF: 0.0350 AC: 121 AN: 3478

ClinVar

Significance: Benign

Submissions summary: Benign:3

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Benign:2

Benign, criteria provided, single submitter	clinical testing	GeneDx	Jun 26, 2018	- -
Benign, criteria provided, single submitter	not provided	Breakthrough Genomics, Breakthrough Genomics	-	- -

Epiphyseal dysplasia, multiple, 2 Benign:1

Benign, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 12, 2018

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.80
CADD	Benign	4.5
DANN	Benign	0.67
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.0

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: rs41480445; hg19: chr1-40766618;