chr2-216428660-G-T

Variant names:

• chr2-216428660-G-T
• NM_014140.4:c.1212G>T
• SMARCAL1 p.Ala404Ala

Variant summary

Our verdict is Likely benign. The variant received -3 ACMG points: 2P and 5B. PM2 BP4_Strong BP7

The NM_014140.4(SMARCAL1):​c.1212G>T​(p.Ala404Ala) 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. A404A) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 33)
• Consequence: SMARCAL1 NM_014140.4 synonymous
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.776
• Publications: 0 publications found

Genes affected

SMARCAL1 (HGNC:11102): (SWI/SNF related, matrix associated, actin dependent regulator of chromatin, subfamily a like 1) The protein encoded by this gene is a member of the SWI/SNF family of proteins. Members of this family have helicase and ATPase activities and are thought to regulate transcription of certain genes by altering the chromatin structure around those genes. The encoded protein shows sequence similarity to the E. coli RNA polymerase-binding protein HepA. Mutations in this gene are a cause of Schimke immunoosseous dysplasia (SIOD), an autosomal recessive disorder with the diagnostic features of spondyloepiphyseal dysplasia, renal dysfunction, and T-cell immunodeficiency. [provided by RefSeq, Jul 2008]

SMARCAL1 Gene-Disease associations (from GenCC):

• Schimke immuno-osseous dysplasia

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

ACMG classification

Our verdict: Likely_benign. The variant received -3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.59).
• BP7: Synonymous conserved (PhyloP=-0.776 with no splicing effect.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_014140.4. 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
	SMARCAL1	NM_014140.4	MANE Select	c.1212G>T	p.Ala404Ala	synonymous	Exon 7 of 18	NP_054859.2
	SMARCAL1	NM_001127207.2		c.1212G>T	p.Ala404Ala	synonymous	Exon 7 of 18	NP_001120679.1	Q9NZC9

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SMARCAL1	ENST00000357276.9	TSL:2 MANE Select	c.1212G>T	p.Ala404Ala	synonymous	Exon 7 of 18	ENSP00000349823.4	Q9NZC9
	SMARCAL1	ENST00000358207.9	TSL:1	c.1212G>T	p.Ala404Ala	synonymous	Exon 7 of 18	ENSP00000350940.5	Q9NZC9
	SMARCAL1	ENST00000392128.6	TSL:1	c.804G>T	p.Ala268Ala	synonymous	Exon 5 of 15	ENSP00000375974.2	H7BYI2

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 33

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.59
CADD	Benign	1.7
DANN	Benign	0.65
PhyloP100		-0.78
PromoterAI		0.0014	Neutral
Mutation Taster		=95/5	polymorphism

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.15		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: chr2-217293383;