8-60266044-A-C

Variant names:

• chr8-60266044-A-C
• rs267606695
• NM_004056.6:c.298T>G

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 4P and 2B. PM2 PM5 BP4_Moderate

The NM_004056.6(CA8):​c.298T>G​(p.Ser100Ala) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 15/22 in silico tools predict a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. S100P) has been classified as Pathogenic.

• Frequency: Genomes: not found (cov: 33)
• Consequence: CA8 NM_004056.6 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 1.95
• Publications: 5 publications found

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: Labcorp Genetics (formerly Invitae), G2P
• cerebellar ataxia

  Inheritance: AR Classification: MODERATE Submitted by: ClinGen
• cerebellar ataxia, intellectual disability, and dysequilibrium

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr8-60266044-A-G is described in ClinVar as Pathogenic. ClinVar VariationId is 17604.Status of the report is no_assertion_criteria_provided, 0 stars.
• BP4: Computational evidence support a benign effect (MetaRNN=0.18867412).

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

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CA8	NM_004056.6	MANE Select	c.298T>G	p.Ser100Ala	missense	Exon 3 of 9	NP_004047.3
	CA8	NM_001321837.2		c.298T>G	p.Ser100Ala	missense	Exon 3 of 8	NP_001308766.1	P35219
	CA8	NM_001321838.2		c.298T>G	p.Ser100Ala	missense	Exon 3 of 9	NP_001308767.1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CA8	ENST00000317995.5	TSL:1 MANE Select	c.298T>G	p.Ser100Ala	missense	Exon 3 of 9	ENSP00000314407.4	P35219
	CA8	ENST00000524872.5	TSL:1	n.536T>G		non_coding_transcript_exon	Exon 3 of 8
	CA8	ENST00000943617.1		c.298T>G	p.Ser100Ala	missense	Exon 3 of 9	ENSP00000613676.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 33

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.00000378

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.090
BayesDel_addAF	Benign	-0.17	T
BayesDel_noAF	Benign	-0.48
CADD	Benign	21
DANN	Uncertain	0.98
DEOGEN2	Benign	0.19	T
Eigen	Benign	-0.37
Eigen_PC	Benign	-0.23
FATHMM_MKL	Benign	0.65	D
LIST_S2	Benign	0.56	T
M_CAP	Benign	0.014	T
MetaRNN	Benign	0.19	T
MetaSVM	Benign	-1.1	T
MutationAssessor	Benign	1.1	L
PhyloP100		1.9
PrimateAI	Uncertain	0.54	T
PROVEAN	Benign	-1.1	N
REVEL	Benign	0.13
Sift	Benign	0.23	T
Sift4G	Benign	0.32	T
Polyphen		0.0	B
Vest4		0.082
MutPred		0.54		Loss of disorder (P = 0.0457)
MVP		0.59
MPC		0.39
ClinPred		0.68	D
GERP RS		3.1
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.0
Varity_R		0.20
gMVP		0.59
Mutation Taster		=85/15	polymorphism

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

Other links and lift over

dbSNP: rs267606695; hg19: chr8-61178603;