NM_002454.3(MTRR):c.1653G>A (p.Pro551=) AND Methylcobalamin deficiency type cblE

Germline classification:: Benign (2 submissions)
Last evaluated:: Feb 4, 2026
Review status:: 1 star out of maximum of 4 stars
criteria provided, single submitter

Somatic classification of clinical impact:: None
Review status:: (0/4) 0 stars out of maximum of 4 stars
no assertion criteria provided

Somatic classification of oncogenicity:: None
Review status:: (0/4) 0 stars out of maximum of 4 stars
no assertion criteria provided

Record status:: current
Accession:: RCV000551951.22

Allele description [Variation Report for NM_002454.3(MTRR):c.1653G>A (p.Pro551=)]

NM_002454.3(MTRR):c.1653G>A (p.Pro551=)

Gene:

MTRR:5-methyltetrahydrofolate-homocysteine methyltransferase reductase [Gene - OMIM - HGNC]

Variant type:

single nucleotide variant

Cytogenetic location:

5p15.31

Genomic location:

Preferred name:

NM_002454.3(MTRR):c.1653G>A (p.Pro551=)

Other names:

p.P578P:CCG>CCA; p.Pro551=

HGVS:

NC_000005.10:g.7895829G>A
NG_008856.1:g.31726G>A
NM_001364440.2:c.1653G>A
NM_001364441.2:c.1653G>A
NM_001364442.2:c.1653G>A
NM_002454.3:c.1653G>AMANE SELECT
NM_024010.4:c.1653G>A
NP_001351369.1:p.Pro551=
NP_001351370.1:p.Pro551=
NP_001351371.1:p.Pro551=
NP_002445.2:p.Pro551=
NP_076915.3:p.Pro551=
NC_000005.9:g.7895942G>A
NM_002454.2:c.1653G>A
NM_024010.2:c.1734G>A
NR_134480.2:n.1732G>A
NR_134481.2:n.1657G>A
NR_134482.2:n.1592G>A
NR_157168.2:n.1706G>A
NR_157169.2:n.1566G>A
NR_157170.2:n.1732G>A
NR_157171.2:n.1589G>A
NR_157172.2:n.1503G>A
NR_157173.2:n.1743G>A
NR_157174.2:n.1744G>A
NR_157175.2:n.1898G>A
NR_157176.2:n.2061G>A
NR_157177.2:n.1741G>A
NR_157178.2:n.1769G>A

Links:

dbSNP: rs139206262

Molecular consequence:

NR_134480.2:n.1732G>A - non-coding transcript variant - [Sequence Ontology: SO:0001619]
NR_134481.2:n.1657G>A - non-coding transcript variant - [Sequence Ontology: SO:0001619]
NR_134482.2:n.1592G>A - non-coding transcript variant - [Sequence Ontology: SO:0001619]
NR_157168.2:n.1706G>A - non-coding transcript variant - [Sequence Ontology: SO:0001619]
NR_157169.2:n.1566G>A - non-coding transcript variant - [Sequence Ontology: SO:0001619]
NR_157170.2:n.1732G>A - non-coding transcript variant - [Sequence Ontology: SO:0001619]
NR_157171.2:n.1589G>A - non-coding transcript variant - [Sequence Ontology: SO:0001619]
NR_157172.2:n.1503G>A - non-coding transcript variant - [Sequence Ontology: SO:0001619]
NR_157173.2:n.1743G>A - non-coding transcript variant - [Sequence Ontology: SO:0001619]
NR_157174.2:n.1744G>A - non-coding transcript variant - [Sequence Ontology: SO:0001619]
NR_157175.2:n.1898G>A - non-coding transcript variant - [Sequence Ontology: SO:0001619]
NR_157176.2:n.2061G>A - non-coding transcript variant - [Sequence Ontology: SO:0001619]
NR_157177.2:n.1741G>A - non-coding transcript variant - [Sequence Ontology: SO:0001619]
NR_157178.2:n.1769G>A - non-coding transcript variant - [Sequence Ontology: SO:0001619]
NM_001364440.2:c.1653G>A - synonymous variant - [Sequence Ontology: SO:0001819]
NM_001364441.2:c.1653G>A - synonymous variant - [Sequence Ontology: SO:0001819]
NM_001364442.2:c.1653G>A - synonymous variant - [Sequence Ontology: SO:0001819]
NM_002454.3:c.1653G>A - synonymous variant - [Sequence Ontology: SO:0001819]
NM_024010.4:c.1653G>A - synonymous variant - [Sequence Ontology: SO:0001819]

Condition(s)

Name:: Methylcobalamin deficiency type cblE (HMAE)
Synonyms:: VITAMIN B12-RESPONSIVE HOMOCYSTINURIA, cblE TYPE; HOMOCYSTINURIA-MEGALOBLASTIC ANEMIA, cblE COMPLEMENTATION TYPE; HOMOCYSTINURIA-MEGALOBLASTIC ANEMIA, cblE TYPE
Identifiers:: MONDO: MONDO:0009354; MedGen: C1856057; Orphanet: 2169; Orphanet: 622; OMIM: 236270

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Submission Accession	Submitter	Review Status (Assertion method)	Clinical Significance (Last evaluated)	Origin	Method	Citations
SCV000641848	Labcorp Genetics (formerly Invitae), Labcorp	criteria provided, single submitter (Invitae Variant Classification Sherloc (09022015))	Benign (Feb 4, 2026)	germline	clinical testing	PubMed (1) [See all records that cite this PMID]
SCV001458154	Natera, Inc.	no assertion criteria provided	Benign (Sep 16, 2020)	germline	clinical testing

Submission Accession

Submitter

Review Status
(Assertion method)

Clinical Significance
(Last evaluated)

Origin

Method

Citations

SCV000641848

Labcorp Genetics (formerly Invitae), Labcorp

criteria provided, single submitter

(Invitae Variant Classification Sherloc (09022015))

Benign
(Feb 4, 2026)

germline

clinical testing

PubMed (1)
[See all records that cite this PMID]

SCV001458154

Natera, Inc.

no assertion criteria provided

Benign
(Sep 16, 2020)

germline

clinical testing

Help

Summary from all submissions

Ethnicity	Origin	Affected	Individuals	Families	Chromosomes tested	Number Tested	Family history	Method
not provided	germline	unknown	not provided	not provided	not provided	not provided	not provided	clinical testing

Citations

PubMed

Sherloc: a comprehensive refinement of the ACMG-AMP variant classification criteria.

Nykamp K, Anderson M, Powers M, Garcia J, Herrera B, Ho YY, Kobayashi Y, Patil N, Thusberg J, Westbrook M; Invitae Clinical Genomics Group, Topper S.

Genet Med. 2017 Oct;19(10):1105-1117. doi: 10.1038/gim.2017.37. Epub 2017 May 11. Erratum in: Genet Med. 2020 Jan;22(1):240. doi: 10.1038/s41436-019-0624-9..

PubMed [citation]

PMID:: 28492532
PMCID:: PMC5632818

Details of each submission

From Labcorp Genetics (formerly Invitae), Labcorp, SCV000641848.10

#	Ethnicity	Individuals	Chromosomes Tested	Family History	Method	Citations
1	not provided	not provided	not provided	not provided	clinical testing	PubMed (1)

#	Sample				Method		Observation
#	Origin	Affected	Number tested	Tissue	Purpose	Method	Individuals	Allele frequency	Families	Co-occurrences
1	germline	unknown	not provided	not provided	not provided		not provided	not provided	not provided	not provided

From Natera, Inc., SCV001458154.1

#	Ethnicity	Individuals	Chromosomes Tested	Family History	Method	Citations
1	not provided	not provided	not provided	not provided	clinical testing	not provided

#	Sample				Method		Observation
#	Origin	Affected	Number tested	Tissue	Purpose	Method	Individuals	Allele frequency	Families	Co-occurrences
1	germline	unknown	not provided	not provided	not provided		not provided	not provided	not provided	not provided

Last Updated: Jul 27, 2026

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