NM_017614.5:c.33+2654A>G

Variant names:

• chr5-79072469-A-G
• rs592052
• NM_017614.5:c.33+2654A>G

Variant summary

Our verdict is Benign. The variant received -12 ACMG points: 0P and 12B. BP4_Strong BA1

The NM_017614.5(BHMT2):​c.33+2654A>G variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.405 in 152,070 control chromosomes in the GnomAD database, including 15,043 homozygotes. 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 0.41 (15043 hom., cov: 32)
• Consequence: BHMT2 NM_017614.5 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.374
• Publications: 4 publications found

Genes affected

BHMT2 (HGNC:1048): (betaine--homocysteine S-methyltransferase 2) Homocysteine is a sulfur-containing amino acid that plays a crucial role in methylation reactions. Transfer of the methyl group from betaine to homocysteine creates methionine, which donates the methyl group to methylate DNA, proteins, lipids, and other intracellular metabolites. The protein encoded by this gene is one of two methyl transferases that can catalyze the transfer of the methyl group from betaine to homocysteine. Anomalies in homocysteine metabolism have been implicated in disorders ranging from vascular disease to neural tube birth defects such as spina bifida. Alternatively spliced transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, May 2010]

DMGDH (HGNC:24475): (dimethylglycine dehydrogenase) This gene encodes an enzyme involved in the catabolism of choline, catalyzing the oxidative demethylation of dimethylglycine to form sarcosine. The enzyme is found as a monomer in the mitochondrial matrix, and uses flavin adenine dinucleotide and folate as cofactors. Mutation in this gene causes dimethylglycine dehydrogenase deficiency, characterized by a fishlike body odor, chronic muscle fatigue, and elevated levels of the muscle form of creatine kinase in serum. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Jul 2013]

DMGDH Gene-Disease associations (from GenCC):

• dimethylglycine dehydrogenase deficiency

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

ACMG classification

Our verdict: Benign. The variant received -12 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.85).
• BA1: GnomAd4 highest subpopulation (EAS) allele frequency at 95% confidence interval = 0.594 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
BHMT2	NM_017614.5	c.33+2654A>G		intron_variant	Intron 1 of 7	ENST00000255192.8	NP_060084.2
BHMT2	NM_001178005.2	c.33+2654A>G		intron_variant	Intron 1 of 6		NP_001171476.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
BHMT2	ENST00000255192.8	c.33+2654A>G		intron_variant	Intron 1 of 7	1	NM_017614.5	ENSP00000255192.3

Frequencies

GnomAD3 genomes AF: 0.405 AC: 61601 AN: 151952 Hom.: 15036 Cov.: 32

Gnomad AFR AF: 0.116

Gnomad AMI AF: 0.693

Gnomad AMR AF: 0.521

Gnomad ASJ AF: 0.380

Gnomad EAS AF: 0.612

Gnomad SAS AF: 0.461

Gnomad FIN AF: 0.573

Gnomad MID AF: 0.456

Gnomad NFE AF: 0.507

Gnomad OTH AF: 0.432

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

GnomAD4 genome AF: 0.405 AC: 61608 AN: 152070 Hom.: 15043 Cov.: 32 AF XY: 0.410 AC XY: 30461 AN XY: 74308

African (AFR) AF: 0.115 AC: 4791 AN: 41520

American (AMR) AF: 0.522 AC: 7972 AN: 15276

Ashkenazi Jewish (ASJ) AF: 0.380 AC: 1317 AN: 3468

East Asian (EAS) AF: 0.612 AC: 3158 AN: 5164

South Asian (SAS) AF: 0.462 AC: 2228 AN: 4820

European-Finnish (FIN) AF: 0.573 AC: 6034 AN: 10538

Middle Eastern (MID) AF: 0.452 AC: 133 AN: 294

European-Non Finnish (NFE) AF: 0.507 AC: 34433 AN: 67964

Other (OTH) AF: 0.430 AC: 910 AN: 2114

Alfa AF: 0.480 Hom.: 7704

Bravo AF: 0.390

Asia WGS AF: 0.512 AC: 1781 AN: 3478

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.85
CADD	Benign	6.2
DANN	Benign	0.80
PhyloP100		-0.37
Mutation Taster		=100/0	polymorphism (auto)

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: rs592052; hg19: chr5-78368292;