X-47211125-C-A

Variant names:

• chrX-47211125-C-A
• NM_003334.4:c.2364C>A
• UBA1 p.Ala788Ala

Variant summary

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

The NM_003334.4(UBA1):​c.2364C>A​(p.Ala788Ala) 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. A788A) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 22)
• Consequence: UBA1 NM_003334.4 synonymous
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.717
• Publications: 0 publications found

Genes affected

UBA1 (HGNC:12469): (ubiquitin like modifier activating enzyme 1) The protein encoded by this gene catalyzes the first step in ubiquitin conjugation to mark cellular proteins for degradation. This gene complements an X-linked mouse temperature-sensitive defect in DNA synthesis, and thus may function in DNA repair. It is part of a gene cluster on chromosome Xp11.23. Alternatively spliced transcript variants that encode the same protein have been described. [provided by RefSeq, Jul 2008]

UBA1 Gene-Disease associations (from GenCC):

• infantile-onset X-linked spinal muscular atrophy

  Inheritance: XL Classification: STRONG, MODERATE, SUPPORTIVE Submitted by: Genomics England PanelApp, Orphanet, Ambry Genetics, Labcorp Genetics (formerly Invitae)
• inflammatory disease

  Inheritance: Unknown Classification: NO_KNOWN Submitted by: Ambry Genetics

LOC105373194 (HGNC:):

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=-0.37).
• BP7: Synonymous conserved (PhyloP=-0.717 with no splicing effect.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_003334.4. 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
	UBA1	NM_003334.4	MANE Select	c.2364C>A	p.Ala788Ala	synonymous	Exon 20 of 26	NP_003325.2
	UBA1	NM_001440807.1		c.2406C>A	p.Ala802Ala	synonymous	Exon 21 of 27	NP_001427736.1
	UBA1	NM_001440809.1		c.2382C>A	p.Ala794Ala	synonymous	Exon 21 of 27	NP_001427738.1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	UBA1	ENST00000335972.11	TSL:1 MANE Select	c.2364C>A	p.Ala788Ala	synonymous	Exon 20 of 26	ENSP00000338413.6	P22314-1
	UBA1	ENST00000377351.8	TSL:1	c.2364C>A	p.Ala788Ala	synonymous	Exon 20 of 26	ENSP00000366568.4	P22314-1
	UBA1	ENST00000880189.1		c.2499C>A	p.Ala833Ala	synonymous	Exon 21 of 27	ENSP00000550248.1

Frequencies

GnomAD3 genomes Cov.: 22

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 22

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.37
CADD	Benign	6.8
DANN	Benign	0.69
PhyloP100		-0.72

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.020		Details are displayed if max score is > 0.2

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

MaxEntScan Visualizer can be used to analyze the impact of this mutation on the neighboring sequence.

Other links and lift over

hg19: chrX-47070524;