chr6-56057833-G-C

Position:

• chr6-56057833-G-C

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 2P and 1B. PM2 BP4

The NM_030820.4(COL21A1):​c.2698C>G​(p.Pro900Ala) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: COL21A1 NM_030820.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 8.62

Genes affected

COL21A1 (HGNC:17025): (collagen type XXI alpha 1 chain) This gene encodes the alpha chain of type XXI collagen, a member of the FACIT (fibril-associated collagens with interrupted helices) collagen family. Type XXI collagen is localized to tissues containing type I collagen and maintains the integrity of the extracellular matrix. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Jan 2016]

ACMG classification

Verdict is Uncertain_significance. Variant got 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.30972487).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
COL21A1	NM_030820.4	c.2698C>G	p.Pro900Ala	missense_variant	30/30	ENST00000244728.10

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
COL21A1	ENST00000244728.10	c.2698C>G	p.Pro900Ala	missense_variant	30/30	1	NM_030820.4	A1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Aug 12, 2021

The c.2698C>G (p.P900A) alteration is located in exon 30 (coding exon 29) of the COL21A1 gene. This alteration results from a C to G substitution at nucleotide position 2698, causing the proline (P) at amino acid position 900 to be replaced by an alanine (A). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.097
BayesDel_addAF	Uncertain	0.11	D
BayesDel_noAF	Uncertain	-0.080
CADD	Uncertain	24
DANN	Benign	0.94
DEOGEN2	Benign	0.028	T;.;.
Eigen	Uncertain	0.52
Eigen_PC	Uncertain	0.53
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.86	D;D;D
M_CAP	Benign	0.036	D
MetaRNN	Benign	0.31	T;T;T
MetaSVM	Uncertain	0.45	D
MutationAssessor	Benign	0.82	L;.;.
MutationTaster	Benign	1.0	D;D;D;D
PrimateAI	Uncertain	0.62	T
PROVEAN	Uncertain	-2.6	D;D;.
REVEL	Uncertain	0.42
Sift	Benign	0.36	T;T;.
Sift4G	Benign	0.55	T;T;T
Polyphen		0.97	D;.;.
Vest4		0.31
MutPred		0.28		Loss of glycosylation at P900 (P = 0.0364);.;.;
MVP		0.61
MPC		0.019
ClinPred		0.81	D
GERP RS		4.2
Varity_R		0.13
gMVP		0.32

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

No publications associated with this variant yet.

Other links and lift over

hg19: chr6-55922631;