rs2847149

Positions:

• chr18-666371-G-A

Variant summary

Our verdict is Benign. Variant got -12 ACMG points: 0P and 12B. BP4_Strong BA1

The NM_001071.4(TYMS):​c.455-2701G>A variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.551 in 151,648 control chromosomes in the GnomAD database, including 24,567 homozygotes. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency: Genomes: 𝑓 0.55 (24567 hom., cov: 30)
• Consequence: TYMS NM_001071.4 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.902

Genes affected

TYMS (HGNC:12441): (thymidylate synthetase) Thymidylate synthase catalyzes the methylation of deoxyuridylate to deoxythymidylate using, 10-methylenetetrahydrofolate (methylene-THF) as a cofactor. This function maintains the dTMP (thymidine-5-prime monophosphate) pool critical for DNA replication and repair. The enzyme has been of interest as a target for cancer chemotherapeutic agents. It is considered to be the primary site of action for 5-fluorouracil, 5-fluoro-2-prime-deoxyuridine, and some folate analogs. Expression of this gene and that of a naturally occurring antisense transcript, mitochondrial enolase superfamily member 1 (GeneID:55556), vary inversely when cell-growth progresses from late-log to plateau phase. Polymorphisms in this gene may be associated with etiology of neoplasia, including breast cancer, and response to chemotherapy. [provided by RefSeq, Aug 2017]

ENOSF1 (HGNC:30365): (enolase superfamily member 1) This gene can encode a mitochondrial enzyme that is thought to convert L-fuconate to 2-keto-3-deoxy-L-fuconate. This locus was originally identified as the source of antisense RNAs of the adjacent thymidylate synthase gene. Splice variants at this locus may contain an alternate 3' exon that is complementary to the 3'UTR and terminal intron of the thymidylate synthase (TS) RNA and may downregulate TS expression. [provided by RefSeq, Aug 2017]

TYMS (HGNC:):

ACMG classification

Verdict is Benign. Variant got -12 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.88).
• BA1: GnomAd4 highest subpopulation (AFR) allele frequency at 95% confidence interval = 0.768 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
TYMS	NM_001071.4	c.455-2701G>A		intron_variant		ENST00000323274.15	NP_001062.1
ENOSF1	XM_047437611.1	c.-1095C>T		5_prime_UTR_variant	2/2		XP_047293567.1
TYMS	NM_001354867.2	c.454+4051G>A		intron_variant			NP_001341796.1
TYMS	NM_001354868.2	c.206-2701G>A		intron_variant			NP_001341797.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
TYMS	ENST00000323274.15	c.455-2701G>A		intron_variant		1	NM_001071.4	ENSP00000315644.10
TYMS	ENST00000323224.7	c.454+4051G>A		intron_variant		1		ENSP00000314727.7
TYMS	ENST00000323250.9	c.206-2701G>A		intron_variant		1		ENSP00000314902.5
TYMS	ENST00000579128.1	n.533-2701G>A		intron_variant		2

Frequencies

GnomAD3 genomes AF: 0.550 AC: 83417 AN: 151530 Hom.: 24521 Cov.: 30

Gnomad AFR AF: 0.775

Gnomad AMI AF: 0.331

Gnomad AMR AF: 0.427

Gnomad ASJ AF: 0.485

Gnomad EAS AF: 0.684

Gnomad SAS AF: 0.533

Gnomad FIN AF: 0.447

Gnomad MID AF: 0.611

Gnomad NFE AF: 0.456

Gnomad OTH AF: 0.542

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome AF: 0.551 AC: 83505 AN: 151648 Hom.: 24567 Cov.: 30 AF XY: 0.549 AC XY: 40706 AN XY: 74086

Gnomad4 AFR AF: 0.775

Gnomad4 AMR AF: 0.427

Gnomad4 ASJ AF: 0.485

Gnomad4 EAS AF: 0.683

Gnomad4 SAS AF: 0.531

Gnomad4 FIN AF: 0.447

Gnomad4 NFE AF: 0.456

Gnomad4 OTH AF: 0.547

Alfa AF: 0.481 Hom.: 17814

Bravo AF: 0.560

Asia WGS AF: 0.629 AC: 2189 AN: 3478

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.88
CADD	Benign	0.45
DANN	Benign	0.53
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1

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

LitVar

Other links and lift over

dbSNP: rs2847149; hg19: chr18-666371; COSMIC: COSV60076327; COSMIC: COSV60076327;