chr3-49417639-ACG-TAA

Variant names:

• chr3-49417639-ACG-TAA
• NM_000481.4:c.1111_1113delCGTinsTTA
• AMT p.Arg371Leu

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PM1

The NM_000481.4(AMT):​c.1111_1113delCGTinsTTA​(p.Arg371Leu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. It is difficult to determine the true allele frequency of this variant because it is of type MNV, and the frequency of such variant types in population databases may be underestimated and unreliable. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R371H) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 32)
• Consequence: AMT NM_000481.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 3.31
• Publications: 0 publications found

Genes affected

AMT (HGNC:473): (aminomethyltransferase) This gene encodes one of four critical components of the glycine cleavage system. Mutations in this gene have been associated with glycine encephalopathy. Multiple transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Sep 2011]

AMT Gene-Disease associations (from GenCC):

• glycine encephalopathy

  Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: ClinGen, Myriad Women's Health, Labcorp Genetics (formerly Invitae)
• glycine encephalopathy 2

  Inheritance: AR Classification: DEFINITIVE Submitted by: G2P
• infantile glycine encephalopathy

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
• neonatal glycine encephalopathy

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
• atypical glycine encephalopathy

  Inheritance: Unknown Classification: SUPPORTIVE Submitted by: Orphanet

ENSG00000283189 (HGNC:):

ACMG classification

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

• PM1: In a hotspot region, there are 2 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 9 uncertain in NM_000481.4

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000481.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	AMT	NM_000481.4	MANE Select	c.1111_1113delCGTinsTTA	p.Arg371Leu	missense	N/A	NP_000472.2
	AMT	NM_001164712.2		c.1111_1113delCGTinsTTA	p.Arg371Leu	missense	N/A	NP_001158184.1	P48728-4
	AMT	NM_001164710.2		c.979_981delCGTinsTTA	p.Arg327Leu	missense	N/A	NP_001158182.1	P48728-3

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	AMT	ENST00000273588.9	TSL:1 MANE Select	c.1111_1113delCGTinsTTA	p.Arg371Leu	missense	N/A	ENSP00000273588.3	P48728-1
	ENSG00000283189	ENST00000636166.1	TSL:5	c.1348_1350delCGTinsTTA	p.Arg450Leu	missense	N/A	ENSP00000490106.1	A0A1B0GUH1
	AMT	ENST00000395338.7	TSL:1	c.1111_1113delCGTinsTTA	p.Arg371Leu	missense	N/A	ENSP00000378747.2	P48728-4

Frequencies

GnomAD3 genomes Cov.: 32

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

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
PhyloP100		3.3

Splicing

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

MaxEntScan Visualizer can be used to analyze the impact of this mutation on the neighboring sequence.

Other links and lift over

hg19: chr3-49455072;