9-21815438-A-C

Variant names:

• chr9-21815438-A-C
• rs139020435
• NM_002451.4:c.39A>C

Variant summary

Our verdict is Benign. The variant received -17 ACMG points: 0P and 17B. BP4_Strong BP6_Very_Strong BP7 BS2

The NM_002451.4(MTAP):​c.39A>C​(p.Gly13Gly) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0004 in 1,593,858 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★).

• Frequency:
  • Genomes: 𝑓 0.00021 (0 hom., cov: 32)
  • Exomes 𝑓: 0.00042 (1 hom.)
• Consequence: MTAP NM_002451.4 synonymous
• Clinical Significance: Benign/Likely benign criteria provided, multiple submitters, no conflicts B:2
• Conservation: PhyloP100: 1.35

Genes affected

MTAP (HGNC:7413): (methylthioadenosine phosphorylase) This gene encodes an enzyme that plays a major role in polyamine metabolism and is important for the salvage pathway of both adenine and methionine. The encoded enzyme is deficient in many cancers. Multiple alternatively spliced transcript variants have been described for this gene. [provided by RefSeq, Sep 2021]

ENSG00000264545 (HGNC:):

ACMG classification

Our verdict: Benign. The variant received -17 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.54).
• BP6: Variant 9-21815438-A-C is Benign according to our data. Variant chr9-21815438-A-C is described in ClinVar as [Likely_benign]. Clinvar id is 366235.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr9-21815438-A-C is described in Lovd as [Likely_benign].
• BP7: Synonymous conserved (PhyloP=1.35 with no splicing effect.
• BS2: High AC in GnomAd4 at 32 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MTAP	NM_002451.4	c.39A>C	p.Gly13Gly	synonymous_variant	Exon 2 of 8	ENST00000644715.2	NP_002442.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
MTAP	ENST00000644715.2	c.39A>C	p.Gly13Gly	synonymous_variant	Exon 2 of 8		NM_002451.4	ENSP00000494373.1

Frequencies

GnomAD3 genomes AF: 0.000210 AC: 32 AN: 152138 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.0000724

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.000865

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.000382

Gnomad OTH AF: 0.00

GnomAD2 exomes AF: 0.000278 AC: 68 AN: 244700 AF XY: 0.000311

Gnomad AFR exome AF: 0.0000623

Gnomad AMR exome AF: 0.000301

Gnomad ASJ exome AF: 0.000603

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.000185

Gnomad NFE exome AF: 0.000393

Gnomad OTH exome AF: 0.000498

GnomAD4 exome AF: 0.000420 AC: 606 AN: 1441720 Hom.: 1 Cov.: 28 AF XY: 0.000435 AC XY: 312 AN XY: 717354

African (AFR) AF: 0.0000608 AC: 2 AN: 32870

American (AMR) AF: 0.000346 AC: 15 AN: 43350

Ashkenazi Jewish (ASJ) AF: 0.000655 AC: 17 AN: 25936

East Asian (EAS) AF: 0.00 AC: 0 AN: 39528

South Asian (SAS) AF: 0.00 AC: 0 AN: 82566

European-Finnish (FIN) AF: 0.000244 AC: 13 AN: 53336

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5292

European-Non Finnish (NFE) AF: 0.000480 AC: 528 AN: 1099108

Other (OTH) AF: 0.000519 AC: 31 AN: 59734

GnomAD4 genome AF: 0.000210 AC: 32 AN: 152138 Hom.: 0 Cov.: 32 AF XY: 0.000229 AC XY: 17 AN XY: 74316

African (AFR) AF: 0.0000724 AC: 3 AN: 41418

American (AMR) AF: 0.00 AC: 0 AN: 15282

Ashkenazi Jewish (ASJ) AF: 0.000865 AC: 3 AN: 3470

East Asian (EAS) AF: 0.00 AC: 0 AN: 5192

South Asian (SAS) AF: 0.00 AC: 0 AN: 4828

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10602

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

European-Non Finnish (NFE) AF: 0.000382 AC: 26 AN: 68026

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

Alfa AF: 0.000376 Hom.: 0

Bravo AF: 0.000219

EpiCase AF: 0.000274

EpiControl AF: 0.000415

ClinVar

Significance: Benign/Likely benign

Submissions summary: Benign:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Diaphyseal medullary stenosis-bone malignancy syndrome Benign:1

Jan 13, 2018

Illumina Laboratory Services, Illumina

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease. -

not provided Benign:1

Jul 01, 2022

CeGaT Center for Human Genetics Tuebingen

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

MTAP: BP4 -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.54
CADD	Benign	11
DANN	Benign	0.87
PhyloP100		1.4
Mutation Taster		=88/12	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

Publications

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Other links and lift over

dbSNP: rs139020435; hg19: chr9-21815437;