chrX-43731723-G-T

Variant names:

• chrX-43731723-G-T
• rs138703731
• NM_000240.4:c.825G>T

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PM2

The NM_000240.4(MAOA):​c.825G>T​(p.Pro275Pro) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000182 in 1,097,726 control chromosomes in the GnomAD database, with no homozygous occurrence. There are no hemizygote samples in GnomAD. 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. P275P) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 23)
  • Exomes 𝑓: 0.0000018 (0 hom. 0 hem.)
• Consequence: MAOA NM_000240.4 synonymous
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.0370
• Publications: 0 publications found

Genes affected

MAOA (HGNC:6833): (monoamine oxidase A) This gene is one of two neighboring gene family members that encode mitochondrial enzymes which catalyze the oxidative deamination of amines, such as dopamine, norepinephrine, and serotonin. Mutation of this gene results in Brunner syndrome. This gene has also been associated with a variety of other psychiatric disorders, including antisocial behavior. Alternatively spliced transcript variants encoding multiple isoforms have been observed. [provided by RefSeq, Jul 2012]

MAOA Gene-Disease associations (from GenCC):

• Brunner syndrome

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

ACMG classification

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000240.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	MAOA	NM_000240.4	MANE Select	c.825G>T	p.Pro275Pro	synonymous	Exon 8 of 15	NP_000231.1
	MAOA	NM_001270458.2		c.426G>T	p.Pro142Pro	synonymous	Exon 9 of 16	NP_001257387.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	MAOA	ENST00000338702.4	TSL:1 MANE Select	c.825G>T	p.Pro275Pro	synonymous	Exon 8 of 15	ENSP00000340684.3
	MAOA	ENST00000967111.1		c.825G>T	p.Pro275Pro	synonymous	Exon 8 of 15	ENSP00000637170.1
	MAOA	ENST00000873971.1		c.825G>T	p.Pro275Pro	synonymous	Exon 8 of 15	ENSP00000544030.1

Frequencies

GnomAD3 genomes Cov.: 23

GnomAD4 exome AF: 0.00000182 AC: 2 AN: 1097726 Hom.: 0 Cov.: 30 AF XY: 0.00 AC XY: 0 AN XY: 363108

African (AFR) AF: 0.00 AC: 0 AN: 26392

American (AMR) AF: 0.00 AC: 0 AN: 35204

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 19384

East Asian (EAS) AF: 0.00 AC: 0 AN: 30193

South Asian (SAS) AF: 0.00 AC: 0 AN: 54137

European-Finnish (FIN) AF: 0.0000494 AC: 2 AN: 40522

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 4136

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 841674

Other (OTH) AF: 0.00 AC: 0 AN: 46084

GnomAD4 genome Cov.: 23

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.84
CADD	Benign	5.8
DANN	Benign	0.39
PhyloP100		-0.037

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.35		Details are displayed if max score is > 0.2
DS_AG_spliceai		0.35		Position offset: 16

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Other links and lift over

dbSNP: rs138703731; hg19: chrX-43590970;