NM_000031.6:c.-75-3185G>C

Variant names:

• chr9-113396819-C-G
• rs2792818
• NM_000031.6:c.-75-3185G>C

Variant summary

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

The NM_000031.6(ALAD):​c.-75-3185G>C variant causes a intron 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.

• Frequency:
  • Genomes: not found (cov: 31)
  • Exomes 𝑓: 0.0 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: ALAD NM_000031.6 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -1.26
• Publications: 3 publications found

Genes affected

ALAD (HGNC:395): (aminolevulinate dehydratase) The ALAD enzyme is composed of 8 identical subunits and catalyzes the condensation of 2 molecules of delta-aminolevulinate to form porphobilinogen (a precursor of heme, cytochromes and other hemoproteins). ALAD catalyzes the second step in the porphyrin and heme biosynthetic pathway; zinc is essential for enzymatic activity. ALAD enzymatic activity is inhibited by lead and a defect in the ALAD structural gene can cause increased sensitivity to lead poisoning and acute hepatic porphyria. Alternative splicing of this gene results in multiple transcript variants encoding different isoforms. [provided by RefSeq, Dec 2015]

ALAD Gene-Disease associations (from GenCC):

• porphyria due to ALA dehydratase deficiency

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

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=-0.86).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
ALAD	NM_000031.6	c.-75-3185G>C		intron_variant	Intron 1 of 11	ENST00000409155.8	NP_000022.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
ALAD	ENST00000409155.8	c.-75-3185G>C		intron_variant	Intron 1 of 11	1	NM_000031.6	ENSP00000386284.3

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome Data not reliable, filtered out with message: AC0 AF: 0.00 AC: 0 AN: 1020 Hom.: 0 Cov.: 0 AF XY: 0.00 AC XY: 0 AN XY: 654

African (AFR) AF: 0.00 AC: 0 AN: 12

American (AMR) AF: 0.00 AC: 0 AN: 8

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

East Asian (EAS) AF: 0.00 AC: 0 AN: 28

South Asian (SAS) AF: 0.00 AC: 0 AN: 24

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 240

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 18

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 588

Other (OTH) AF: 0.00 AC: 0 AN: 100

GnomAD4 genome Cov.: 31

Alfa AF: 0.00 Hom.: 4280

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.86
CADD	Benign	0.16
DANN	Benign	0.50
PhyloP100		-1.3
PromoterAI		-0.042	Neutral

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: rs2792818; hg19: chr9-116159099;