1-236825063-G-C

Variant names:

• chr1-236825063-G-C
• rs12060264
• NM_000254.3:c.866-275G>C

Variant summary

Our verdict is Benign. The variant received -8 ACMG points: 0P and 8B. BP4_Strong BS1

The NM_000254.3(MTR):​c.866-275G>C variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000509 in 151,396 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: 𝑓 0.00051 (0 hom., cov: 30)
• Consequence: MTR NM_000254.3 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.103
• Publications: 8 publications found

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]

MTR Gene-Disease associations (from GenCC):

• methylcobalamin deficiency type cblG

  Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Orphanet, ClinGen, Labcorp Genetics (formerly Invitae), G2P

ACMG classification

Our verdict: Benign. The variant received -8 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.9).
• BS1: Variant frequency is greater than expected in population afr. GnomAd4 allele frequency = 0.000509 (77/151396) while in subpopulation AFR AF = 0.00141 (58/41174). AF 95% confidence interval is 0.00112. There are 0 homozygotes in GnomAd4. There are 31 alleles in the male GnomAd4 subpopulation. Median coverage is 30. This position passed quality control check.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MTR	NM_000254.3	c.866-275G>C		intron_variant	Intron 9 of 32	ENST00000366577.10	NP_000245.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
MTR	ENST00000366577.10	c.866-275G>C		intron_variant	Intron 9 of 32	1	NM_000254.3	ENSP00000355536.5

Frequencies

GnomAD3 genomes AF: 0.000516 AC: 78 AN: 151306 Hom.: 0 Cov.: 30

Gnomad AFR AF: 0.00144

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000263

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.000191

Gnomad OTH AF: 0.000963

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

GnomAD4 genome AF: 0.000509 AC: 77 AN: 151396 Hom.: 0 Cov.: 30 AF XY: 0.000419 AC XY: 31 AN XY: 73934

African (AFR) AF: 0.00141 AC: 58 AN: 41174

American (AMR) AF: 0.000263 AC: 4 AN: 15230

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3472

East Asian (EAS) AF: 0.00 AC: 0 AN: 5134

South Asian (SAS) AF: 0.00 AC: 0 AN: 4808

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10370

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 292

European-Non Finnish (NFE) AF: 0.000191 AC: 13 AN: 67912

Other (OTH) AF: 0.000955 AC: 2 AN: 2094

Alfa AF: 0.00 Hom.: 6192

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.90
CADD	Benign	1.5
DANN	Benign	0.36
PhyloP100		0.10

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: rs12060264; hg19: chr1-236988363;