NM_002860.4:c.1605+138T>G

Variant names:

• chr10-95616339-A-C
• rs749049
• NM_002860.4:c.1605+138T>G

Variant summary

Our verdict is Likely benign. The variant received -4 ACMG points: 0P and 4B. BP4_Strong

The NM_002860.4(ALDH18A1):​c.1605+138T>G variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000174 in 1,088,916 control chromosomes in the GnomAD database, with no homozygous occurrence. 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: not found (cov: 33)
  • Exomes 𝑓: 0.000017 (0 hom.)
• Consequence: ALDH18A1 NM_002860.4 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.639
• Publications: 2 publications found

Genes affected

ALDH18A1 (HGNC:9722): (aldehyde dehydrogenase 18 family member A1) This gene is a member of the aldehyde dehydrogenase family and encodes a bifunctional ATP- and NADPH-dependent mitochondrial enzyme with both gamma-glutamyl kinase and gamma-glutamyl phosphate reductase activities. The encoded protein catalyzes the reduction of glutamate to delta1-pyrroline-5-carboxylate, a critical step in the de novo biosynthesis of proline, ornithine and arginine. Mutations in this gene lead to hyperammonemia, hypoornithinemia, hypocitrullinemia, hypoargininemia and hypoprolinemia and may be associated with neurodegeneration, cataracts and connective tissue diseases. Alternatively spliced transcript variants, encoding different isoforms, have been described for this gene. [provided by RefSeq, Jul 2008]

ALDH18A1 Gene-Disease associations (from GenCC):

• cutis laxa, autosomal dominant 3

  Inheritance: AD, SD Classification: DEFINITIVE, STRONG, MODERATE Submitted by: Genomics England PanelApp, G2P, Labcorp Genetics (formerly Invitae), Ambry Genetics
• ALDH18A1-related de Barsy syndrome

  Inheritance: AR, AD Classification: DEFINITIVE, STRONG, MODERATE, SUPPORTIVE Submitted by: Genomics England PanelApp, G2P, Orphanet, Labcorp Genetics (formerly Invitae), Ambry Genetics
• autosomal recessive complex spastic paraplegia type 9B

  Inheritance: AR, AD Classification: DEFINITIVE, STRONG, SUPPORTIVE, LIMITED Submitted by: G2P, Labcorp Genetics (formerly Invitae), Orphanet, Ambry Genetics
• P5CS deficiency

  Inheritance: SD Classification: DEFINITIVE Submitted by: ClinGen, Illumina
• hereditary spastic paraplegia 9A

  Inheritance: AD, SD Classification: MODERATE, SUPPORTIVE Submitted by: Orphanet, Ambry Genetics
• autosomal dominant complex spastic paraplegia type 9B

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• autosomal dominant cutis laxa

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Likely_benign. The variant received -4 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.95).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
ALDH18A1	NM_002860.4	c.1605+138T>G		intron_variant	Intron 13 of 17	ENST00000371224.7	NP_002851.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
ALDH18A1	ENST00000371224.7	c.1605+138T>G		intron_variant	Intron 13 of 17	1	NM_002860.4	ENSP00000360268.2
ALDH18A1	ENST00000371221.3	c.1599+138T>G		intron_variant	Intron 13 of 17	1		ENSP00000360265.3
ALDH18A1	ENST00000485428.1	n.221+138T>G		intron_variant	Intron 1 of 3	2

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.0000174 AC: 19 AN: 1088916 Hom.: 0 AF XY: 0.0000183 AC XY: 10 AN XY: 546850

African (AFR) AF: 0.00 AC: 0 AN: 25436

American (AMR) AF: 0.00 AC: 0 AN: 33086

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 21820

East Asian (EAS) AF: 0.00 AC: 0 AN: 34220

South Asian (SAS) AF: 0.00 AC: 0 AN: 69016

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 36532

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 3438

European-Non Finnish (NFE) AF: 0.0000220 AC: 18 AN: 817756

Other (OTH) AF: 0.0000210 AC: 1 AN: 47612

GnomAD4 genome Cov.: 33

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.95
CADD	Benign	1.3
DANN	Benign	0.32
PhyloP100		-0.64

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: rs749049; hg19: chr10-97376096;