12-105062890-C-G

Position:

• chr12-105062890-C-G

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 2P and 1B. PM2 BP4

The NM_001034173.4(ALDH1L2):​c.919G>C​(p.Ala307Pro) variant causes a missense, splice region change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 16/23 in silico tools predict a benign outcome for this variant. 3/3 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: ALDH1L2 NM_001034173.4 missense, splice_region
• Scores: Splicing: ADA: 0.1559
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 2.84

Genes affected

ALDH1L2 (HGNC:26777): (aldehyde dehydrogenase 1 family member L2) This gene encodes a member of both the aldehyde dehydrogenase superfamily and the formyl transferase superfamily. This member is the mitochondrial form of 10-formyltetrahydrofolate dehydrogenase (FDH), which converts 10-formyltetrahydrofolate to tetrahydrofolate and CO2 in an NADP(+)-dependent reaction, and plays an essential role in the distribution of one-carbon groups between the cytosolic and mitochondrial compartments of the cell. Alternatively spliced transcript variants have been found for this gene.[provided by RefSeq, Oct 2010]

NOPCHAP1 (HGNC:28628): (NOP protein chaperone 1) Enables box C/D snoRNP complex binding activity. Involved in box C/D snoRNP assembly. Predicted to be located in nucleus. [provided by Alliance of Genome Resources, Apr 2022]

ACMG classification

Verdict is Uncertain_significance. Variant got 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.4196064).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
ALDH1L2	NM_001034173.4	c.919G>C	p.Ala307Pro	missense_variant, splice_region_variant	7/23	ENST00000258494.14

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
ALDH1L2	ENST00000258494.14	c.919G>C	p.Ala307Pro	missense_variant, splice_region_variant	7/23	1	NM_001034173.4	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Feb 12, 2024

The c.919G>C (p.A307P) alteration is located in exon 7 (coding exon 7) of the ALDH1L2 gene. This alteration results from a G to C substitution at nucleotide position 919, causing the alanine (A) at amino acid position 307 to be replaced by a proline (P). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.15
BayesDel_addAF	Benign	-0.053	T
BayesDel_noAF	Benign	-0.31
CADD	Benign	21
DANN	Uncertain	0.99
DEOGEN2	Benign	0.028	T
Eigen	Benign	-0.075
Eigen_PC	Benign	0.11
FATHMM_MKL	Uncertain	0.95	D
LIST_S2	Benign	0.72	T
M_CAP	Benign	0.0041	T
MetaRNN	Benign	0.42	T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	1.5	L
MutationTaster	Benign	1.0	D;D
PrimateAI	Benign	0.38	T
PROVEAN	Benign	-1.0	N
REVEL	Benign	0.17
Sift	Benign	0.13	T
Sift4G	Benign	0.20	T
Polyphen		0.0010	B
Vest4		0.57
MutPred		0.65		Gain of ubiquitination at K306 (P = 0.0483);
MVP		0.52
MPC		0.23
ClinPred		0.78	D
GERP RS		4.2
Varity_R		0.31
gMVP		0.85

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Benign	0.16
dbscSNV1_RF	Benign	0.29
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

No publications associated with this variant yet.

Other links and lift over

hg19: chr12-105456668;