NM_001099735.2:c.230G>A

Variant names:

• chr5-81252772-G-A
• rs778884873
• NM_001099735.2:c.230G>A

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PM2

The NM_001099735.2(CKMT2):​c.230G>A​(p.Arg77His) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.0000477 in 1,614,066 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R77C) has been classified as Uncertain significance.

• Frequency:
  • Genomes: 𝑓 0.000053 (0 hom., cov: 32)
  • Exomes 𝑓: 0.000047 (0 hom.)
• Consequence: CKMT2 NM_001099735.2 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 9.96
• Publications: 0 publications found

Genes affected

CKMT2 (HGNC:1996): (creatine kinase, mitochondrial 2) Mitochondrial creatine kinase (MtCK) is responsible for the transfer of high energy phosphate from mitochondria to the cytosolic carrier, creatine. It belongs to the creatine kinase isoenzyme family. It exists as two isoenzymes, sarcomeric MtCK and ubiquitous MtCK, encoded by separate genes. Mitochondrial creatine kinase occurs in two different oligomeric forms: dimers and octamers, in contrast to the exclusively dimeric cytosolic creatine kinase isoenzymes. Sarcomeric mitochondrial creatine kinase has 80% homology with the coding exons of ubiquitous mitochondrial creatine kinase. This gene contains sequences homologous to several motifs that are shared among some nuclear genes encoding mitochondrial proteins and thus may be essential for the coordinated activation of these genes during mitochondrial biogenesis. Three transcript variants encoding the same protein have been found for this gene. [provided by RefSeq, Jul 2008]

CKMT2-AS1 (HGNC:48997): (CKMT2 antisense RNA 1)

ACMG classification

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

• PM2: Very rare variant in population databases, with high coverage

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001099735.2. 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
	CKMT2	NM_001099735.2	MANE Select	c.230G>A	p.Arg77His	missense	Exon 3 of 10	NP_001093205.1	P17540
	CKMT2	NM_001099736.2		c.230G>A	p.Arg77His	missense	Exon 3 of 10	NP_001093206.1	P17540
	CKMT2	NM_001825.3		c.230G>A	p.Arg77His	missense	Exon 4 of 11	NP_001816.2	P17540

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CKMT2	ENST00000254035.9	TSL:1 MANE Select	c.230G>A	p.Arg77His	missense	Exon 3 of 10	ENSP00000254035.4	P17540
	CKMT2	ENST00000424301.6	TSL:1	c.230G>A	p.Arg77His	missense	Exon 4 of 11	ENSP00000404203.2	P17540
	CKMT2	ENST00000865076.1		c.230G>A	p.Arg77His	missense	Exon 3 of 10	ENSP00000535135.1

Frequencies

GnomAD3 genomes AF: 0.0000526 AC: 8 AN: 152176 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.0000241

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.000377

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000441

Gnomad OTH AF: 0.00

GnomAD2 exomes AF: 0.0000795 AC: 20 AN: 251438 AF XY: 0.0000662

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.000116

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.0000544

Gnomad FIN exome AF: 0.000462

Gnomad NFE exome AF: 0.0000352

Gnomad OTH exome AF: 0.000163

GnomAD4 exome AF: 0.0000472 AC: 69 AN: 1461890 Hom.: 0 Cov.: 32 AF XY: 0.0000413 AC XY: 30 AN XY: 727248

African (AFR) AF: 0.00 AC: 0 AN: 33480

American (AMR) AF: 0.0000894 AC: 4 AN: 44724

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26136

East Asian (EAS) AF: 0.00 AC: 0 AN: 39700

South Asian (SAS) AF: 0.00 AC: 0 AN: 86258

European-Finnish (FIN) AF: 0.000599 AC: 32 AN: 53418

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5768

European-Non Finnish (NFE) AF: 0.0000243 AC: 27 AN: 1112010

Other (OTH) AF: 0.0000993 AC: 6 AN: 60396

GnomAD4 genome AF: 0.0000526 AC: 8 AN: 152176 Hom.: 0 Cov.: 32 AF XY: 0.0000135 AC XY: 1 AN XY: 74344

African (AFR) AF: 0.0000241 AC: 1 AN: 41440

American (AMR) AF: 0.00 AC: 0 AN: 15280

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3470

East Asian (EAS) AF: 0.00 AC: 0 AN: 5196

South Asian (SAS) AF: 0.00 AC: 0 AN: 4830

European-Finnish (FIN) AF: 0.000377 AC: 4 AN: 10612

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 316

European-Non Finnish (NFE) AF: 0.0000441 AC: 3 AN: 68028

Other (OTH) AF: 0.00 AC: 0 AN: 2092

Alfa AF: 0.0000434 Hom.: 0

Bravo AF: 0.0000189

ExAC AF: 0.0000988 AC: 12

ClinVar

ClinVar submissions

Significance: Uncertain significance

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
-	1	-	not specified (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.15
BayesDel_addAF	Benign	-0.086	T
BayesDel_noAF	Benign	-0.14
CADD	Uncertain	24
DANN	Pathogenic	1.0
DEOGEN2	Uncertain	0.52	D
Eigen	Pathogenic	1.0
Eigen_PC	Pathogenic	1.0
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.90	D
M_CAP	Benign	0.071	D
MetaRNN	Uncertain	0.72	D
MetaSVM	Uncertain	0.22	D
MutationAssessor	Pathogenic	3.2	M
PhyloP100		10
PrimateAI	Uncertain	0.50	T
PROVEAN	Uncertain	-2.7	D
REVEL	Uncertain	0.43
Sift	Benign	0.12	T
Sift4G	Benign	0.15	T
Polyphen		0.99	D
Vest4		0.64
MVP		0.97
MPC		1.2
ClinPred		0.84	D
GERP RS		6.0
Varity_R		0.58
gMVP		0.71
Mutation Taster		=51/49	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: rs778884873; hg19: chr5-80548591;