chr18-658332-C-G

Variant names:

• chr18-658332-C-G
• rs72634355
• ENST00000323813.6:n.21G>C

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The ENST00000323813.6(TYMSOS):​n.21G>C variant causes a non coding transcript exon change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000167 in 1,198,896 control chromosomes in the GnomAD database, with no homozygous occurrence. 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: not found (cov: 33)
  • Exomes 𝑓: 0.0000017 (0 hom.)
• Consequence: TYMSOS ENST00000323813.6 non_coding_transcript_exon
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -1.07
• Publications: 0 publications found

Genes affected

TYMSOS (HGNC:29553): (TYMS opposite strand RNA)

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]

ACMG classification

Our verdict: Likely_benign. The variant received -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.79).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TYMS	NM_001071.4	c.205+385C>G		intron_variant	Intron 1 of 6	ENST00000323274.15	NP_001062.1
TYMS	NM_001354867.2	c.205+385C>G		intron_variant	Intron 1 of 5		NP_001341796.1
TYMS	NM_001354868.2	c.205+385C>G		intron_variant	Intron 1 of 4		NP_001341797.1
TYMSOS	NR_171001.1	n.-41G>C		upstream_gene_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TYMS	ENST00000323274.15	c.205+385C>G		intron_variant	Intron 1 of 6	1	NM_001071.4	ENSP00000315644.10

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.00000167 AC: 2 AN: 1198896 Hom.: 0 Cov.: 32 AF XY: 0.00 AC XY: 0 AN XY: 588734

African (AFR) AF: 0.00 AC: 0 AN: 25986

American (AMR) AF: 0.00 AC: 0 AN: 26944

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 17994

East Asian (EAS) AF: 0.00 AC: 0 AN: 17146

South Asian (SAS) AF: 0.00 AC: 0 AN: 76190

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 30626

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 4452

European-Non Finnish (NFE) AF: 0.00000210 AC: 2 AN: 954560

Other (OTH) AF: 0.00 AC: 0 AN: 44998

GnomAD4 genome Cov.: 33

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.79
CADD	Benign	1.4
DANN	Benign	0.63
PhyloP100		-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

Other links and lift over

dbSNP: rs72634355; hg19: chr18-658332;