chr1-18872155-C-T

Variant names:

• chr1-18872155-C-T
• rs886045704
• NM_003748.4:c.*690G>A

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_003748.4(ALDH4A1):​c.*690G>A variant causes a 3 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000198 in 151,322 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: 𝑓 0.000020 (0 hom., cov: 36)
  • Exomes 𝑓: 0.0 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: ALDH4A1 NM_003748.4 3_prime_UTR
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: -0.401

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]

ACMG classification

Our verdict: Likely_benign. The variant received -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.89).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
ALDH4A1	NM_003748.4	c.*690G>A		3_prime_UTR_variant	Exon 15 of 15	ENST00000375341.8	NP_003739.2
ALDH4A1	NM_001319218.2	c.*690G>A		3_prime_UTR_variant	Exon 14 of 14		NP_001306147.1
ALDH4A1	NM_001161504.2	c.*690G>A		3_prime_UTR_variant	Exon 15 of 15		NP_001154976.1
ALDH4A1	NM_170726.3	c.*42-365G>A		intron_variant	Intron 15 of 15		NP_733844.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
ALDH4A1	ENST00000375341.8	c.*690G>A		3_prime_UTR_variant	Exon 15 of 15	1	NM_003748.4	ENSP00000364490.3
ALDH4A1	ENST00000538839.5	c.*690G>A		3_prime_UTR_variant	Exon 14 of 14	1		ENSP00000446071.1
ALDH4A1	ENST00000290597.9	c.*42-365G>A		intron_variant	Intron 15 of 15	1		ENSP00000290597.5

Frequencies

GnomAD3 genomes AF: 0.0000198 AC: 3 AN: 151204 Hom.: 0 Cov.: 36

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000199

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.00

Gnomad OTH AF: 0.00

GnomAD4 exome Data not reliable, filtered out with message: AC0 AF: 0.00 AC: 0 AN: 204 Hom.: 0 Cov.: 0 AF XY: 0.00 AC XY: 0 AN XY: 170

African (AFR) AF: 0.00 AC: 0 AN: 2

American (AMR) AF: 0.00 AC: 0 AN: 2

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 2

East Asian (EAS) AF: 0.00 AC: 0 AN: 6

South Asian (SAS) AC: 0 AN: 0

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 4

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 2

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 178

Other (OTH) AF: 0.00 AC: 0 AN: 8

GnomAD4 genome AF: 0.0000198 AC: 3 AN: 151322 Hom.: 0 Cov.: 36 AF XY: 0.0000135 AC XY: 1 AN XY: 73884

African (AFR) AF: 0.00 AC: 0 AN: 41434

American (AMR) AF: 0.000199 AC: 3 AN: 15084

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3464

East Asian (EAS) AF: 0.00 AC: 0 AN: 5020

South Asian (SAS) AF: 0.00 AC: 0 AN: 4720

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10534

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 294

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 67772

Other (OTH) AF: 0.00 AC: 0 AN: 2094

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.0000189

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Hyperprolinemia type 2 Uncertain:1

Jan 13, 2018

Illumina Laboratory Services, Illumina

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.89
CADD	Benign	0.34
DANN	Benign	0.74
PhyloP100		-0.40
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.3

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

Publications

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Other links and lift over

dbSNP: rs886045704; hg19: chr1-19198649;