rs115885226

Positions:

• chr8-60281082-T-C

Variant summary

Our verdict is Benign. Variant got -19 ACMG points: 0P and 19B. BP4_Moderate BP6_Very_Strong BP7 BS1 BS2

The NM_004056.6(CA8):​c.66A>G​(p.Glu22Glu) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00245 in 1,610,634 control chromosomes in the GnomAD database, including 90 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★★).

• Frequency:
  • Genomes: 𝑓 0.013 (41 hom., cov: 33)
  • Exomes 𝑓: 0.0013 (49 hom.)
• Consequence: CA8 NM_004056.6 synonymous
• Clinical Significance: Benign criteria provided, multiple submitters, no conflicts B:4
• Conservation: PhyloP100: -1.57

Genes affected

CA8 (HGNC:1382): (carbonic anhydrase 8) The protein encoded by this gene was initially named CA-related protein because of sequence similarity to other known carbonic anhydrase genes. However, the gene product lacks carbonic anhydrase activity (i.e., the reversible hydration of carbon dioxide). The gene product continues to carry a carbonic anhydrase designation based on clear sequence identity to other members of the carbonic anhydrase gene family. The absence of CA8 gene transcription in the cerebellum of the lurcher mutant in mice with a neurologic defect suggests an important role for this acatalytic form. Mutations in this gene are associated with cerebellar ataxia, mental retardation, and dysequilibrium syndrome 3 (CMARQ3). Polymorphisms in this gene are associated with osteoporosis, and overexpression of this gene in osteosarcoma cells suggests an oncogenic role. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Mar 2016]

CA8 (HGNC:):

ACMG classification

Verdict is Benign. Variant got -19 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.42).
• BP6: Variant 8-60281082-T-C is Benign according to our data. Variant chr8-60281082-T-C is described in ClinVar as [Benign]. Clinvar id is 128542.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• BP7: Synonymous conserved (PhyloP=-1.57 with no splicing effect.
• BS1: Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.0134 (2031/152120) while in subpopulation AFR AF= 0.0468 (1943/41496). AF 95% confidence interval is 0.0451. There are 41 homozygotes in gnomad4. There are 959 alleles in male gnomad4 subpopulation. Median coverage is 33. This position pass quality control queck.
• BS2: High Homozygotes in GnomAd4 at 41 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
CA8	NM_004056.6	c.66A>G	p.Glu22Glu	synonymous_variant	1/9	ENST00000317995.5	NP_004047.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
CA8	ENST00000317995.5	c.66A>G	p.Glu22Glu	synonymous_variant	1/9	1	NM_004056.6	ENSP00000314407.4
CA8	ENST00000524872.5	n.304A>G		non_coding_transcript_exon_variant	1/8	1
CA8	ENST00000529918.1	n.243A>G		non_coding_transcript_exon_variant	1/3	2

Frequencies

GnomAD3 genomes AF: 0.0133 AC: 2027 AN: 152002 Hom.: 41 Cov.: 33

Gnomad AFR AF: 0.0469

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00445

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.000415

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000883

Gnomad OTH AF: 0.00573

GnomAD3 exomes AF: 0.00354 AC: 863 AN: 243620 Hom.: 16 AF XY: 0.00255 AC XY: 337 AN XY: 132300

Gnomad AFR exome AF: 0.0491

Gnomad AMR exome AF: 0.00222

Gnomad ASJ exome AF: 0.000101

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.0000333

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000733

Gnomad OTH exome AF: 0.00199

GnomAD4 exome AF: 0.00132 AC: 1920 AN: 1458514 Hom.: 49 Cov.: 32 AF XY: 0.00112 AC XY: 811 AN XY: 725600

Gnomad4 AFR exome AF: 0.0471

Gnomad4 AMR exome AF: 0.00269

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.000105

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.0000171

Gnomad4 OTH exome AF: 0.00320

GnomAD4 genome AF: 0.0134 AC: 2031 AN: 152120 Hom.: 41 Cov.: 33 AF XY: 0.0129 AC XY: 959 AN XY: 74364

Gnomad4 AFR AF: 0.0468

Gnomad4 AMR AF: 0.00445

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.000416

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.0000883

Gnomad4 OTH AF: 0.00567

Alfa AF: 0.00619 Hom.: 6

Bravo AF: 0.0147

ClinVar

Significance: Benign

Submissions summary: Benign:4

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Benign:2

Benign, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Dec 31, 2019	- -
Benign, criteria provided, single submitter	not provided	Breakthrough Genomics, Breakthrough Genomics	-	- -

not specified Benign:1

Benign, criteria provided, single submitter

clinical testing

Genetic Services Laboratory, University of Chicago

Jul 08, 2013

- -

Inborn genetic diseases Benign:1

Benign, criteria provided, single submitter

clinical testing

Ambry Genetics

Jul 05, 2016

This alteration is classified as benign based on a combination of the following: seen in unaffected individuals, population frequency, intact protein function, lack of segregation with disease, co-occurrence, RNA analysis, in silico models, amino acid conservation, lack of disease association in case-control studies, and/or the mechanism of disease or impacted region is inconsistent with a known cause of pathogenicity. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.42
CADD	Benign	5.4
DANN	Benign	0.70
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		2.8

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: rs115885226; hg19: chr8-61193641;