dbSNP rs115885226: CA8:p.Glu22Glu (chr8-60281082-T-C) – ACMG Classification: Benign (-19 pts)

Variant summary

Our verdict is Benign. The variant received -19 ACMG points: 0P and 19B. BP4_ModerateBP6_Very_StrongBP7BS1BS2

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

Scores

Clinical Significance

Benign criteria provided, multiple submitters, no conflicts B:5

Conservation

PhyloP100: -1.57

Publications

1 publications found

Variant links:

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 Gene-Disease associations (from GenCC):

cerebellar ataxia, intellectual disability, and dysequilibrium syndrome 3
Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: G2P, Labcorp Genetics (formerly Invitae)
cerebellar ataxia
Inheritance: AR Classification: MODERATE Submitted by: ClinGen
cerebellar ataxia, intellectual disability, and dysequilibrium
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

CA8 links:

Genome browser will be placed here

new If you want to explore the variant's impact on the transcript NM_004056.6, check out the Mutation Effect Viewer. This is especially useful for frameshift variants or if you want to visualize the effect of exon loss / intron retention.

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -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 VariationId 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 the male GnomAd4 subpopulation. Median coverage is 33. This position passed quality control check.

BS2

High Homozygotes in GnomAd4 at 41 AR gene

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_004056.6. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
CA8	NM_004056.6	MANE Select	c.66A>G	p.Glu22Glu	synonymous	Exon 1 of 9	NP_004047.3
CA8	NM_001321837.2		c.66A>G	p.Glu22Glu	synonymous	Exon 1 of 8	NP_001308766.1	P35219
CA8	NM_001321838.2		c.66A>G	p.Glu22Glu	synonymous	Exon 1 of 9	NP_001308767.1

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
CA8	ENST00000317995.5	TSL:1 MANE Select	c.66A>G	p.Glu22Glu	synonymous	Exon 1 of 9	ENSP00000314407.4	P35219
CA8	ENST00000524872.5	TSL:1	n.304A>G		non_coding_transcript_exon	Exon 1 of 8
CA8	ENST00000943617.1		c.66A>G	p.Glu22Glu	synonymous	Exon 1 of 9	ENSP00000613676.1

Frequencies

GnomAD3 genomes

AF:

0.0133

AC:

2027

AN:

152002

Hom.:

Cov.:

show subpopulations

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

GnomAD2 exomes

AF:

0.00354

AC:

863

AN:

243620

AF XY:

0.00255

show subpopulations

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 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.:

Cov.:

AF XY:

0.00112

AC XY:

811

AN XY:

725600

show subpopulations

African (AFR)

AF:

0.0471

AC:

1575

AN:

33408

American (AMR)

AF:

0.00269

AC:

120

AN:

44638

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26066

East Asian (EAS)

AF:

0.00

AC:

AN:

39664

South Asian (SAS)

AF:

0.000105

AC:

AN:

85910

European-Finnish (FIN)

AF:

0.00

AC:

AN:

51588

Middle Eastern (MID)

AF:

0.000694

AC:

AN:

5764

European-Non Finnish (NFE)

AF:

0.0000171

AC:

AN:

1111198

Other (OTH)

AF:

0.00320

AC:

193

AN:

60278

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.462

Heterozygous variant carriers

181

272

362

453

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

104

156

208

260

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.0134

AC:

2031

AN:

152120

Hom.:

Cov.:

AF XY:

0.0129

AC XY:

959

AN XY:

74364

show subpopulations

African (AFR)

AF:

0.0468

AC:

1943

AN:

41496

American (AMR)

AF:

0.00445

AC:

AN:

15294

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3468

East Asian (EAS)

AF:

0.00

AC:

AN:

5150

South Asian (SAS)

AF:

0.000416

AC:

AN:

4810

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10608

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.0000883

AC:

AN:

67972

Other (OTH)

AF:

0.00567

AC:

AN:

2116

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.500

Heterozygous variant carriers

100

201

301

402

502

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Genome Hom

Variant carriers

100

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.00653

Hom.:

Bravo

AF:

0.0147

ClinVar

ClinVar submissions

Significance:Benign

Revision:criteria provided, multiple submitters, no conflicts

View on ClinVar

Pathogenic

VUS

Benign

Condition

not provided (2)

not specified (2)

Inborn genetic diseases (1)

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.42

CADD

Benign

5.4

(source)

DANN

Benign

0.70

PhyloP100

-1.6

PromoterAI

0.014

Neutral

(source)

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

2.8

Mutation Taster

=100/0

polymorphism

(source)

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

MaxEntScan Visualizer can be used to analyze the impact of this mutation on the neighboring sequence.

Publications

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over