chr1-236795593-C-T

Position:

• chr1-236795593-C-T

Variant summary

Our verdict is Benign. Variant got -20 ACMG points: 0P and 20B. BP4_Strong BP6_Very_Strong BS1 BS2

The NM_000254.3(MTR):​c.-111C>T variant causes a 5 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00143 in 1,596,028 control chromosomes in the GnomAD database, including 32 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★).

• Frequency:
  • Genomes: 𝑓 0.0077 (15 hom., cov: 33)
  • Exomes 𝑓: 0.00077 (17 hom.)
• Consequence: MTR NM_000254.3 5_prime_UTR
• Clinical Significance: Benign/Likely benign criteria provided, multiple submitters, no conflicts B:3
• Conservation: PhyloP100: 0.417

Genes affected

MTR (HGNC:7468): (5-methyltetrahydrofolate-homocysteine methyltransferase) This gene encodes the 5-methyltetrahydrofolate-homocysteine methyltransferase. This enzyme, also known as cobalamin-dependent methionine synthase, catalyzes the final step in methionine biosynthesis. Mutations in MTR have been identified as the underlying cause of methylcobalamin deficiency complementation group G. Alternatively spliced transcript variants encoding distinct isoforms have been found for this gene. [provided by RefSeq, May 2014]

ACMG classification

Verdict is Benign. Variant got -20 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.76).
• BP6: Variant 1-236795593-C-T is Benign according to our data. Variant chr1-236795593-C-T is described in ClinVar as [Likely_benign]. Clinvar id is 296543.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• BS1: Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.00769 (1171/152362) while in subpopulation AFR AF= 0.0267 (1112/41590). AF 95% confidence interval is 0.0254. There are 15 homozygotes in gnomad4. There are 533 alleles in male gnomad4 subpopulation. Median coverage is 33. This position pass quality control queck.
• BS2: High Homozygotes in GnomAd4 at 15 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
MTR	NM_000254.3	c.-111C>T		5_prime_UTR_variant	1/33	ENST00000366577.10	NP_000245.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
MTR	ENST00000366577.10	c.-111C>T		5_prime_UTR_variant	1/33	1	NM_000254.3	ENSP00000355536	P1

Frequencies

GnomAD3 genomes AF: 0.00759 AC: 1156 AN: 152244 Hom.: 15 Cov.: 33

Gnomad AFR AF: 0.0265

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00255

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.000207

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000882

Gnomad OTH AF: 0.00621

GnomAD3 exomes AF: 0.00190 AC: 428 AN: 224778 Hom.: 6 AF XY: 0.00145 AC XY: 179 AN XY: 123268

Gnomad AFR exome AF: 0.0273

Gnomad AMR exome AF: 0.00118

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.0000340

Gnomad FIN exome AF: 0.000131

Gnomad NFE exome AF: 0.0000887

Gnomad OTH exome AF: 0.000707

GnomAD4 exome AF: 0.000774 AC: 1118 AN: 1443666 Hom.: 17 Cov.: 31 AF XY: 0.000685 AC XY: 492 AN XY: 718064

Gnomad4 AFR exome AF: 0.0263

Gnomad4 AMR exome AF: 0.00127

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000353

Gnomad4 FIN exome AF: 0.0000672

Gnomad4 NFE exome AF: 0.0000623

Gnomad4 OTH exome AF: 0.00175

GnomAD4 genome AF: 0.00769 AC: 1171 AN: 152362 Hom.: 15 Cov.: 33 AF XY: 0.00715 AC XY: 533 AN XY: 74494

Gnomad4 AFR AF: 0.0267

Gnomad4 AMR AF: 0.00255

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.000207

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.0000882

Gnomad4 OTH AF: 0.00614

Alfa AF: 0.00423 Hom.: 3

Bravo AF: 0.00882

Asia WGS AF: 0.00173 AC: 6 AN: 3478

ClinVar

Significance: Benign/Likely benign

Submissions summary: Benign:3

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Benign:2

Likely benign, criteria provided, single submitter	clinical testing	GeneDx	May 13, 2021	- -
Likely benign, criteria provided, single submitter	not provided	Breakthrough Genomics, Breakthrough Genomics	-	- -

Disorders of Intracellular Cobalamin Metabolism Benign:1

Benign, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 13, 2018

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. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.76
CADD	Benign	8.2
DANN	Benign	0.91

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: rs113809927; hg19: chr1-236958893;