Genetic Variant NM_000032.5:c.1725C>T (chrX-55009219-G-A) – ACMG Classification: Benign (-11 pts)

Variant summary

Our verdict is Benign. Variant got -11 ACMG points: 0P and 11B. BP4_StrongBP6_ModerateBP7BS2

The NM_000032.5(ALAS2):c.1725C>T(p.Phe575Phe) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000058 in 1,206,025 control chromosomes in the GnomAD database, with no homozygous occurrence. There are 2 hemizygotes in GnomAD. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★).

Frequency

Genomes: 𝑓 0.000018 ( 0 hom., 0 hem., cov: 23)

Exomes 𝑓: 0.0000046 ( 0 hom. 2 hem. )

Consequence

ALAS2
NM_000032.5 synonymous

Scores

Clinical Significance

Likely benign criteria provided, single submitter B:1

Conservation

PhyloP100: 0.311

Variant links:

Genes affected

ALAS2 (HGNC:397): (5'-aminolevulinate synthase 2) The product of this gene specifies an erythroid-specific mitochondrially located enzyme. The encoded protein catalyzes the first step in the heme biosynthetic pathway. Defects in this gene cause X-linked pyridoxine-responsive sideroblastic anemia. Alternatively spliced transcript variants encoding different isoforms have been identified. [provided by RefSeq, Jul 2008]

ALAS2 links:

APEX2 (HGNC:17889): (apurinic/apyrimidinic endodeoxyribonuclease 2) Apurinic/apyrimidinic (AP) sites occur frequently in DNA molecules by spontaneous hydrolysis, by DNA damaging agents or by DNA glycosylases that remove specific abnormal bases. AP sites are pre-mutagenic lesions that can prevent normal DNA replication so the cell contains systems to identify and repair such sites. Class II AP endonucleases cleave the phosphodiester backbone 5' to the AP site. This gene encodes a protein shown to have a weak class II AP endonuclease activity. Most of the encoded protein is located in the nucleus but some is also present in mitochondria. This protein may play an important role in both nuclear and mitochondrial base excision repair. Alternatively spliced transcript variants encoding multiple isoforms have been observed for this gene. [provided by RefSeq, Nov 2012]

APEX2 links:

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ACMG classification

Classification made for transcript

Verdict is Benign. Variant got -11 ACMG points.

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.66).

BP6

Variant X-55009219-G-A is Benign according to our data. Variant chrX-55009219-G-A is described in ClinVar as [Likely_benign]. Clinvar id is 753250.Status of the report is criteria_provided_single_submitter, 1 stars.

BP7

Synonymous conserved (PhyloP=0.311 with no splicing effect.

BS2

High Hemizygotes in GnomAdExome4 at 2 XL gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
ALAS2	NM_000032.5 link	c.1725C>T	p.Phe575Phe	synonymous_variant	Exon 11 of 11	ENST00000650242.1	NP_000023.2	P22557-1
APEX2	NM_014481.4 link	c.*1784G>A		downstream_gene_variant		ENST00000374987.4	NP_055296.2	Q9UBZ4E5KN95

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
ALAS2	ENST00000650242.1 link	c.1725C>T	p.Phe575Phe	synonymous_variant	Exon 11 of 11		NM_000032.5	ENSP00000497236.1		P22557-1
APEX2	ENST00000374987.4 link	c.*1784G>A		downstream_gene_variant		1	NM_014481.4	ENSP00000364126.3		Q9UBZ4

Frequencies

GnomAD3 genomes

AF:

0.0000180

AC:

AN:

111039

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

33215

show subpopulations

Gnomad AFR

AF:

0.0000656

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

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

AF:

0.00000457

AC:

AN:

1094986

Hom.:

Cov.:

AF XY:

0.00000555

AC XY:

AN XY:

360646

show subpopulations

Gnomad4 AFR exome

AF:

0.0000379

Gnomad4 AMR exome

AF:

0.0000287

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00000357

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.0000180

AC:

AN:

111039

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

33215

show subpopulations

Gnomad4 AFR

AF:

0.0000656

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.00000756

ClinVar

Significance: Likely benign

Submissions summary: Benign:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not provided

Benign:1

Mar 10, 2021

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.66

CADD

Benign

2.2

DANN

Benign

0.80

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

LitVar

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over