1-18876432-T-A

Variant names:

• chr1-18876432-T-A
• rs2230706
• NM_003748.4:c.1221A>T

Variant summary

Our verdict is Likely benign. The variant received -1 ACMG points: 2P and 3B. PM2 BP4_Moderate BP7

The NM_003748.4(ALDH4A1):​c.1221A>T​(p.Ala407Ala) variant causes a synonymous 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. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Synonymous variant affecting the same amino acid position (i.e. A407A) has been classified as Benign.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: ALDH4A1 NM_003748.4 synonymous
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.128
• Publications: 17 publications found

Genes affected

ALDH4A1 (HGNC:406): (aldehyde dehydrogenase 4 family member A1) This protein belongs to the aldehyde dehydrogenase family of proteins. This enzyme is a mitochondrial matrix NAD-dependent dehydrogenase which catalyzes the second step of the proline degradation pathway, converting pyrroline-5-carboxylate to glutamate. Deficiency of this enzyme is associated with type II hyperprolinemia, an autosomal recessive disorder characterized by accumulation of delta-1-pyrroline-5-carboxylate (P5C) and proline. Alternatively spliced transcript variants encoding different isoforms have been identified for this gene. [provided by RefSeq, Jun 2009]

ALDH4A1 Gene-Disease associations (from GenCC):

• hyperprolinemia type 2

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

ACMG classification

Our verdict: Likely_benign. The variant received -1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.42).
• BP7: Synonymous conserved (PhyloP=0.128 with no splicing effect.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_003748.4. 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
	ALDH4A1	NM_003748.4	MANE Select	c.1221A>T	p.Ala407Ala	synonymous	Exon 12 of 15	NP_003739.2
	ALDH4A1	NM_170726.3		c.1221A>T	p.Ala407Ala	synonymous	Exon 12 of 16	NP_733844.1	P30038-1
	ALDH4A1	NM_001161504.2		c.1041A>T	p.Ala347Ala	synonymous	Exon 12 of 15	NP_001154976.1	P30038-2

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	ALDH4A1	ENST00000375341.8	TSL:1 MANE Select	c.1221A>T	p.Ala407Ala	synonymous	Exon 12 of 15	ENSP00000364490.3	P30038-1
	ALDH4A1	ENST00000290597.9	TSL:1	c.1221A>T	p.Ala407Ala	synonymous	Exon 12 of 16	ENSP00000290597.5	P30038-1
	ALDH4A1	ENST00000538839.5	TSL:1	c.1185+776A>T		intron	N/A	ENSP00000446071.1	P30038-3

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD2 exomes AF: 0.00 AC: 0 AN: 240402 AF XY: 0.00

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome Data not reliable, filtered out with message: AC0;AS_VQSR AF: 0.00 AC: 0 AN: 1455732 Hom.: 0 Cov.: 56 AF XY: 0.00 AC XY: 0 AN XY: 723916

African (AFR) AF: 0.00 AC: 0 AN: 33374

American (AMR) AF: 0.00 AC: 0 AN: 44166

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26086

East Asian (EAS) AF: 0.00 AC: 0 AN: 39514

South Asian (SAS) AF: 0.00 AC: 0 AN: 85908

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 51216

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5580

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1109784

Other (OTH) AF: 0.00 AC: 0 AN: 60104

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.42
CADD	Benign	1.0
DANN	Benign	0.82
PhyloP100		0.13
Mutation Taster		=100/0	polymorphism

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.080		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: rs2230706; hg19: chr1-19202926;