2-216447163-G-A

Position:

• chr2-216447163-G-A

Variant summary

Our verdict is Benign. Variant got -9 ACMG points: 0P and 9B. BP6 BS1 BS2

The NM_014140.4(SMARCAL1):​c.1851+5G>A variant causes a splice region, intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000418 in 1,613,934 control chromosomes in the GnomAD database, including 2 homozygotes. In-silico tool predicts a benign outcome for this variant. 2/3 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

• Frequency:
  • Genomes: 𝑓 0.0012 (0 hom., cov: 30)
  • Exomes 𝑓: 0.00034 (2 hom.)
• Consequence: SMARCAL1 NM_014140.4 splice_region, intron
• Scores: Splicing: ADA: 0.9798
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:2 B:3
• Conservation: PhyloP100: -0.618

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 (HGNC:):

ACMG classification

Verdict is Benign. Variant got -9 ACMG points.

• BP6: Variant 2-216447163-G-A is Benign according to our data. Variant chr2-216447163-G-A is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 463146.We mark this variant Likely_benign, oryginal submissions are: {Likely_benign=2, Uncertain_significance=2}.
• BS1: Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.00115 (175/152144) while in subpopulation AFR AF= 0.00318 (132/41516). AF 95% confidence interval is 0.00274. There are 0 homozygotes in gnomad4. There are 80 alleles in male gnomad4 subpopulation. Median coverage is 30. This position pass quality control queck.
• BS2: High Homozygotes in GnomAdExome4 at 2 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
SMARCAL1	NM_014140.4	c.1851+5G>A		splice_region_variant, intron_variant		ENST00000357276.9	NP_054859.2
SMARCAL1	NM_001127207.2	c.1851+5G>A		splice_region_variant, intron_variant			NP_001120679.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
SMARCAL1	ENST00000357276.9	c.1851+5G>A		splice_region_variant, intron_variant		2	NM_014140.4	ENSP00000349823.4

Frequencies

GnomAD3 genomes AF: 0.00115 AC: 175 AN: 152026 Hom.: 0 Cov.: 30

Gnomad AFR AF: 0.00319

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00138

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: 0.000265

Gnomad OTH AF: 0.00191

GnomAD3 exomes AF: 0.000689 AC: 173 AN: 251226 Hom.: 0 AF XY: 0.000560 AC XY: 76 AN XY: 135800

Gnomad AFR exome AF: 0.00351

Gnomad AMR exome AF: 0.00225

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.000264

Gnomad OTH exome AF: 0.00131

GnomAD4 exome AF: 0.000342 AC: 500 AN: 1461790 Hom.: 2 Cov.: 32 AF XY: 0.000304 AC XY: 221 AN XY: 727208

Gnomad4 AFR exome AF: 0.00335

Gnomad4 AMR exome AF: 0.00239

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000116

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.000222

Gnomad4 OTH exome AF: 0.000447

GnomAD4 genome AF: 0.00115 AC: 175 AN: 152144 Hom.: 0 Cov.: 30 AF XY: 0.00108 AC XY: 80 AN XY: 74380

Gnomad4 AFR AF: 0.00318

Gnomad4 AMR AF: 0.00137

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.000265

Gnomad4 OTH AF: 0.00189

Alfa AF: 0.000381 Hom.: 0

Bravo AF: 0.00149

EpiCase AF: 0.000436

EpiControl AF: 0.000533

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:2 Benign:3

Revision: criteria provided, conflicting classifications

Submissions by phenotype

Schimke immuno-osseous dysplasia Uncertain:1 Benign:2

Uncertain significance, criteria provided, single submitter	clinical testing	Center for Genomics, Ann and Robert H. Lurie Children's Hospital of Chicago	Mar 30, 2021	SMARCAL1 NM_014140.3 exon 11 c.1851+5G>A: This variant has not been reported in the literature but is present in 0.3% (84/24022) of African alleles in the Genome Aggregation Database (http://gnomad.broadinstitute.org/variant/2-217311886-G-A). This variant is present in ClinVar (Variation ID:463146). Evolutionary conservation and computational predictive tools for this variant are limited or unavailable. This variant is an intronic variant; splice prediction tools are unclear whether this variant may or may not affect splicing. Further studies are needed to understand its impact. In summary, data on this variant is insufficient for disease classification. Therefore, the clinical significance of this variant is uncertain. -
Likely benign, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Jan 31, 2024	- -
Likely benign, no assertion criteria provided	clinical testing	Natera, Inc.	Sep 16, 2020	- -

not provided Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Eurofins Ntd Llc (ga)

Jan 09, 2017

- -

SMARCAL1-related disorder Benign:1

Likely benign, criteria provided, single submitter

clinical testing

PreventionGenetics, part of Exact Sciences

Mar 25, 2021

This variant is classified as likely benign based on ACMG/AMP sequence variant interpretation guidelines (Richards et al. 2015 PMID: 25741868, with internal and published modifications). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.81
CADD	Benign	13
DANN	Benign	0.46

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Pathogenic	0.98
dbscSNV1_RF	Pathogenic	0.72
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

Other links and lift over

dbSNP: rs2066514; hg19: chr2-217311886;