22-50526000-C-T

Variant names:

Variant summary

Our verdict is Pathogenic. The variant received 12 ACMG points: 12P and 0B. PVS1_ModeratePM2PP5_Very_Strong

The NM_001953.5(TYMP):c.1300+1G>A variant causes a splice donor, intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000698 in 1,432,820 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. 3/3 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as Pathogenic (★★).

Frequency

Genomes: 𝑓 0.0000066 ( 0 hom., cov: 34)

Exomes 𝑓: 0.0000070 ( 0 hom. )

Consequence

TYMP
NM_001953.5 splice_donor, intron

Scores

Splicing: ADA: 1.000

Clinical Significance

Pathogenic criteria provided, multiple submitters, no conflicts P:7

Conservation

PhyloP100: 3.21

Publications

0 publications found

Variant links:

Genes affected

TYMP (HGNC:3148): (thymidine phosphorylase) This gene encodes an angiogenic factor which promotes angiogenesis in vivo and stimulates the in vitro growth of a variety of endothelial cells. It has a highly restricted target cell specificity acting only on endothelial cells. Mutations in this gene have been associated with mitochondrial neurogastrointestinal encephalomyopathy. Multiple alternatively spliced transcript variants have been identified. [provided by RefSeq, Apr 2012]

TYMP links:

SCO2 (HGNC:10604): (synthesis of cytochrome C oxidase 2) Cytochrome c oxidase (COX) catalyzes the transfer of electrons from cytochrome c to molecular oxygen, which helps to maintain the proton gradient across the inner mitochondrial membrane that is necessary for aerobic ATP production. Human COX is a multimeric protein complex that requires several assembly factors; this gene encodes one of the COX assembly factors. The encoded protein is a metallochaperone that is involved in the biogenesis of cytochrome c oxidase subunit II. Mutations in this gene are associated with fatal infantile encephalocardiomyopathy and myopia 6. [provided by RefSeq, Oct 2014]

SCO2 Gene-Disease associations (from GenCC):

cardioencephalomyopathy, fatal infantile, due to cytochrome c oxidase deficiency 1
Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), G2P
Leigh syndrome
Inheritance: AR Classification: DEFINITIVE Submitted by: ClinGen
myopia 6
Inheritance: AD Classification: STRONG Submitted by: G2P
autosomal recessive axonal charcot-marie-tooth disease due to copper metabolism defect
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

SCO2 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Pathogenic. The variant received 12 ACMG points.

PVS1

Splicing +-2 bp (donor or acceptor) variant, product NOT destroyed by NMD, known LOF gene, truncates exone, which is 0.09730849 fraction of the gene. Cryptic splice site detected, with MaxEntScore 3.5, offset of -22, new splice context is: gacGTgggt. Cryptic site results in frameshift change. If cryptic site found is not functional and variant results in exon loss, it results in inframe change.

PM2

Very rare variant in population databases, with high coverage;

PP5

Variant 22-50526000-C-T is Pathogenic according to our data. Variant chr22-50526000-C-T is described in ClinVar as Pathogenic. ClinVar VariationId is 223069.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001953.5. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Gene	Transcript	Tags	HGVSc	Effect	Exon Rank	Protein
TYMP	NM_001953.5	MANE Select	c.1300+1G>A	splice_donor intron	N/A	NP_001944.1
TYMP	NM_001257989.1		c.1315+1G>A	splice_donor intron	N/A	NP_001244918.1
TYMP	NM_001113755.3		c.1300+1G>A	splice_donor intron	N/A	NP_001107227.1

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	Effect	Exon Rank	Protein
TYMP	ENST00000252029.8	TSL:1 MANE Select	c.1300+1G>A	splice_donor intron	N/A	ENSP00000252029.3
TYMP	ENST00000395681.6	TSL:1	c.1315+1G>A	splice_donor intron	N/A	ENSP00000379038.1
TYMP	ENST00000395678.7	TSL:1	c.1300+1G>A	splice_donor intron	N/A	ENSP00000379036.3

Frequencies

GnomAD3 genomes

AF:

0.00000658

AC:

AN:

151982

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

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:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000147

Gnomad OTH

AF:

0.00

GnomAD4 exome

AF:

0.00000703

AC:

AN:

1280838

Hom.:

Cov.:

AF XY:

0.0000111

AC XY:

AN XY:

630272

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

25326

American (AMR)

AF:

0.00

AC:

AN:

20598

Ashkenazi Jewish (ASJ)

AF:

0.0000471

AC:

AN:

21234

East Asian (EAS)

AF:

0.00

AC:

AN:

28036

South Asian (SAS)

AF:

0.00

AC:

AN:

66270

European-Finnish (FIN)

AF:

0.00

AC:

AN:

32192

Middle Eastern (MID)

AF:

0.00

AC:

AN:

3778

European-Non Finnish (NFE)

AF:

0.00000776

AC:

AN:

1030598

Other (OTH)

AF:

0.00

AC:

AN:

52806

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.447

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<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:

0.00000658

AC:

AN:

151982

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

74244

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

41410

American (AMR)

AF:

0.00

AC:

AN:

15258

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3472

East Asian (EAS)

AF:

0.00

AC:

AN:

5182

South Asian (SAS)

AF:

0.00

AC:

AN:

4836

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10548

Middle Eastern (MID)

AF:

0.00

AC:

AN:

314

European-Non Finnish (NFE)

AF:

0.0000147

AC:

AN:

67962

Other (OTH)

AF:

0.00

AC:

AN:

2090

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.525

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Alfa

AF:

0.00

Hom.:

Bravo

AF:

0.00000756

ClinVar

ClinVar submissions as Germline

Significance:Pathogenic

Revision:criteria provided, multiple submitters, no conflicts

View on ClinVar

Pathogenic

VUS

Benign

Condition

Mitochondrial DNA depletion syndrome 1 (4)

Inborn genetic diseases (1)

Mitochondrial neurogastrointestinal encephalomyopathy (1)

not provided (1)

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

BayesDel_addAF

Pathogenic

0.17

BayesDel_noAF

Uncertain

0.010

CADD

Uncertain

(source)

DANN

Uncertain

0.98

Eigen

Uncertain

0.46

Eigen_PC

Benign

0.12

FATHMM_MKL

Uncertain

0.96

PhyloP100

3.2

GERP RS

2.8

PromoterAI

-0.010

Neutral

(source)

Mutation Taster

=1/99

disease causing (ClinVar)

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

dbscSNV1_ADA

Pathogenic

1.0

dbscSNV1_RF

Pathogenic

0.93

SpliceAI score (max)

0.93

Details are displayed if max score is > 0.2

DS_DL_spliceai

0.93

Position offset: 1

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

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

ClinVar

Computational scores

Splicing

Publications

Other links and lift over