chr8-85464097-G-C

Position:

• chr8-85464097-G-C

Variant summary

Our verdict is Likely pathogenic. Variant got 6 ACMG points: 6P and 0B. PM2 PP3_Strong

The NM_000067.3(CA2):​c.16G>C​(p.Gly6Arg) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: CA2 NM_000067.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 6.49

Genes affected

CA2 (HGNC:1373): (carbonic anhydrase 2) The protein encoded by this gene is one of several isozymes of carbonic anhydrase, which catalyzes reversible hydration of carbon dioxide. Defects in this enzyme are associated with osteopetrosis and renal tubular acidosis. Two transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Jun 2014]

CA3-AS1 (HGNC:51657): (CA3 antisense RNA 1)

ACMG classification

Verdict is Likely_pathogenic. Variant got 6 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.947

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
CA2	NM_000067.3	c.16G>C	p.Gly6Arg	missense_variant	1/7	ENST00000285379.10	NP_000058.1
CA3-AS1	NR_121630.1	n.334+485C>G		intron_variant, non_coding_transcript_variant
CA2	NM_001293675.2	c.-169G>C		5_prime_UTR_variant	1/6		NP_001280604.1
CA3-AS1	NR_121631.1	n.106+131C>G		intron_variant, non_coding_transcript_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
CA2	ENST00000285379.10	c.16G>C	p.Gly6Arg	missense_variant	1/7	1	NM_000067.3	ENSP00000285379	P1
CA3-AS1	ENST00000521761.6	n.334+485C>G		intron_variant, non_coding_transcript_variant		4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 32

Bravo AF: 0.00000378

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

May 23, 2023

In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) has been performed at Invitae for this missense variant, however the output from this modeling did not meet the statistical confidence thresholds required to predict the impact of this variant on CA2 protein function. ClinVar contains an entry for this variant (Variation ID: 2110074). This variant has not been reported in the literature in individuals affected with CA2-related conditions. This variant is not present in population databases (gnomAD no frequency). This sequence change replaces glycine, which is neutral and non-polar, with arginine, which is basic and polar, at codon 6 of the CA2 protein (p.Gly6Arg). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.95
BayesDel_addAF	Uncertain	0.16	D
BayesDel_noAF	Uncertain	-0.010
CADD	Pathogenic	28
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.75	D
Eigen	Pathogenic	0.77
Eigen_PC	Pathogenic	0.67
FATHMM_MKL	Uncertain	0.90	D
LIST_S2	Uncertain	0.96	D
M_CAP	Pathogenic	0.86	D
MetaRNN	Pathogenic	0.95	D
MetaSVM	Uncertain	0.79	D
MutationAssessor	Pathogenic	3.4	M
MutationTaster	Benign	1.0	D
PrimateAI	Uncertain	0.65	T
PROVEAN	Pathogenic	-6.0	D
REVEL	Pathogenic	0.80
Sift	Uncertain	0.010	D
Sift4G	Uncertain	0.022	D
Polyphen		1.0	D
Vest4		0.65
MutPred		0.77		Gain of MoRF binding (P = 1e-04);
MVP		0.95
MPC		1.0
ClinPred		1.0	D
GERP RS		4.5
Varity_R		0.96
gMVP		0.91

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: rs1219072767; hg19: chr8-86376326;