17-18328782-G-T

Position:

• chr17-18328782-G-T

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_004169.5(SHMT1):​c.1420C>A​(p.Leu474Ile) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 15/21 in silico tools predict 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: 32)
  • Exomes 𝑓: 0.0 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: SHMT1 NM_004169.5 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.551

Genes affected

SHMT1 (HGNC:10850): (serine hydroxymethyltransferase 1) This gene encodes the cytosolic form of serine hydroxymethyltransferase, a pyridoxal phosphate-containing enzyme that catalyzes the reversible conversion of serine and tetrahydrofolate to glycine and 5,10-methylene tetrahydrofolate. This reaction provides one-carbon units for synthesis of methionine, thymidylate, and purines in the cytoplasm. This gene is located within the Smith-Magenis syndrome region on chromosome 17. A pseudogene of this gene is located on the short arm of chromosome 1. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Aug 2013]

ACMG classification

Verdict is Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.09159297).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
SHMT1	NM_004169.5	c.1420C>A	p.Leu474Ile	missense_variant	12/12	ENST00000316694.8	NP_004160.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
SHMT1	ENST00000316694.8	c.1420C>A	p.Leu474Ile	missense_variant	12/12	1	NM_004169.5	ENSP00000318868	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Data not reliable, filtered out with message: AC0;AS_VQSR AF: 0.00 AC: 0 AN: 1442404 Hom.: 0 Cov.: 38 AF XY: 0.00 AC XY: 0 AN XY: 715986

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.079
BayesDel_addAF	Benign	-0.27	T
BayesDel_noAF	Benign	-0.62
CADD	Benign	6.7
DANN	Benign	0.88
DEOGEN2	Benign	0.18	.;T;.
Eigen	Benign	-1.1
Eigen_PC	Benign	-1.2
FATHMM_MKL	Benign	0.076	N
LIST_S2	Uncertain	0.92	D;D;D
M_CAP	Benign	0.0070	T
MetaRNN	Benign	0.092	T;T;T
MetaSVM	Benign	-0.98	T
MutationAssessor	Benign	2.0	.;M;.
MutationTaster	Benign	1.0	N;N;N;N;N
PrimateAI	Benign	0.31	T
PROVEAN	Benign	-0.49	.;N;N
REVEL	Benign	0.021
Sift	Benign	0.16	.;T;T
Sift4G	Benign	0.11	T;T;T
Polyphen		0.0, 0.0030	.;B;B
Vest4		0.12
MutPred		0.20		.;Gain of catalytic residue at P476 (P = 0.0399);.;
MVP		0.30
MPC		0.20
ClinPred		0.056	T
GERP RS		-4.5
Varity_R		0.077
gMVP		0.22

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: rs1979277; hg19: chr17-18232096;