20-32017819-G-C

Position:

• chr20-32017819-G-C

Variant summary

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

The NM_001365692.1(CCM2L):​c.218G>C​(p.Trp73Ser) variant causes a missense change. The variant allele was found at a frequency of 0.00000342 in 1,461,864 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 31)
  • Exomes 𝑓: 0.0000034 (0 hom.)
• Consequence: CCM2L NM_001365692.1 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 4.08

Genes affected

CCM2L (HGNC:16153): (CCM2 like scaffold protein) Predicted to act upstream of or within several processes, including heart development; negative regulation of homotypic cell-cell adhesion; and positive regulation of fibroblast growth factor production. [provided by Alliance of Genome Resources, Apr 2022]

ENSG00000226239 (HGNC:):

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=0.2769242).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
CCM2L	NM_001365692.1	c.218G>C	p.Trp73Ser	missense_variant	3/10	ENST00000452892.3	NP_001352621.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
CCM2L	ENST00000452892.3	c.218G>C	p.Trp73Ser	missense_variant	3/10	2	NM_001365692.1	ENSP00000392448.2
CCM2L	ENST00000262659.12	c.218G>C	p.Trp73Ser	missense_variant	3/9	1		ENSP00000262659.8
ENSG00000226239	ENST00000653258.1	n.705-10170C>G		intron_variant
ENSG00000226239	ENST00000662576.1	n.816-10170C>G		intron_variant

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome AF: 0.00000342 AC: 5 AN: 1461864 Hom.: 0 Cov.: 33 AF XY: 0.00 AC XY: 0 AN XY: 727240

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000270

Gnomad4 OTH exome AF: 0.0000331

GnomAD4 genome Cov.: 31

Bravo AF: 0.0000113

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

May 06, 2022

The c.218G>C (p.W73S) alteration is located in exon 3 (coding exon 3) of the CCM2L gene. This alteration results from a G to C substitution at nucleotide position 218, causing the tryptophan (W) at amino acid position 73 to be replaced by a serine (S). 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	Pathogenic	0.96
BayesDel_addAF	Uncertain	0.088	D
BayesDel_noAF	Benign	-0.11
CADD	Pathogenic	28
DANN	Benign	0.91
Eigen	Benign	0.083
Eigen_PC	Benign	0.20
FATHMM_MKL	Uncertain	0.94	D
LIST_S2	Benign	0.82	T
M_CAP	Benign	0.021	T
MetaRNN	Benign	0.28	T
MetaSVM	Benign	-1.1	T
MutationAssessor	Benign	0.90	L
PrimateAI	Pathogenic	0.89	D
PROVEAN	Uncertain	-4.2	D
REVEL	Benign	0.25
Sift	Benign	0.57	T
Sift4G	Uncertain	0.053	T
Polyphen		0.61	P
Vest4		0.55
MutPred		0.47		Gain of disorder (P = 0.0016);
MVP		0.42
MPC		0.093
ClinPred		0.96	D
GERP RS		4.4
gMVP		0.63

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: rs2064752864; hg19: chr20-30605622;