chr2-216468028-G-C

Variant names:

• chr2-216468028-G-C
• rs2271335
• NM_014140.4:c.2226G>C

Variant summary

Our verdict is Likely benign. The variant received -4 ACMG points: 2P and 6B. PM2 BP4_Strong BP6_Moderate

The NM_014140.4(SMARCAL1):​c.2226G>C​(p.Thr742Thr) 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. Variant has been reported in ClinVar as Likely benign (★). Synonymous variant affecting the same amino acid position (i.e. T742T) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 32)
• Consequence: SMARCAL1 NM_014140.4 synonymous
• Clinical Significance: Likely benign criteria provided, single submitter B:1
• Conservation: PhyloP100: -2.63
• 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: G2P, Orphanet, ClinGen, Labcorp Genetics (formerly Invitae)

ACMG classification

Our verdict: Likely_benign. The variant received -4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.92).
• BP6: Variant 2-216468028-G-C is Benign according to our data. Variant chr2-216468028-G-C is described in ClinVar as Likely_benign. ClinVar VariationId is 2829691.Status of the report is criteria_provided_single_submitter, 1 stars.

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

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SMARCAL1	NM_014140.4	MANE Select	c.2226G>C	p.Thr742Thr	synonymous	Exon 14 of 18	NP_054859.2
	SMARCAL1	NM_001127207.2		c.2226G>C	p.Thr742Thr	synonymous	Exon 14 of 18	NP_001120679.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SMARCAL1	ENST00000357276.9	TSL:2 MANE Select	c.2226G>C	p.Thr742Thr	synonymous	Exon 14 of 18	ENSP00000349823.4
	SMARCAL1	ENST00000358207.9	TSL:1	c.2226G>C	p.Thr742Thr	synonymous	Exon 14 of 18	ENSP00000350940.5
	SMARCAL1	ENST00000392128.6	TSL:1	c.1752G>C	p.Thr584Thr	synonymous	Exon 11 of 15	ENSP00000375974.2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 32

ClinVar

ClinVar submissions as Germline

Significance: Likely benign

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
-	-	1	Schimke immuno-osseous dysplasia (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.92
CADD	Benign	0.018
DANN	Benign	0.28
PhyloP100		-2.6
Mutation Taster		=100/0	polymorphism

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		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: rs2271335; hg19: chr2-217332751;