16-69187438-T-G

Position:

• chr16-69187438-T-G

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_006750.4(SNTB2):​c.272T>G​(p.Leu91Arg) variant causes a missense 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. 13/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 31)
• Consequence: SNTB2 NM_006750.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.0690

Genes affected

SNTB2 (HGNC:11169): (syntrophin beta 2) Dystrophin is a large, rod-like cytoskeletal protein found at the inner surface of muscle fibers. Dystrophin is missing in Duchenne Muscular Dystrophy patients and is present in reduced amounts in Becker Muscular Dystrophy patients. The protein encoded by this gene is a peripheral membrane protein found associated with dystrophin and dystrophin-related proteins. This gene is a member of the syntrophin gene family, which contains at least two other structurally-related genes. [provided by RefSeq, Jul 2008]

UTP4 (HGNC:1983): (UTP4 small subunit processome component) This gene encodes a WD40-repeat-containing protein that is localized to the nucleolus. Mutation of this gene causes North American Indian childhood cirrhosis, a severe intrahepatic cholestasis that results in transient neonatal jaundice, and progresses to periportal fibrosis and cirrhosis in childhood and adolescence. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Jan 2016]

ACMG classification

Verdict is Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.101940095).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
SNTB2	NM_006750.4	c.272T>G	p.Leu91Arg	missense_variant	1/7	ENST00000336278.9
SNTB2	NR_172088.1	n.275T>G		non_coding_transcript_exon_variant	1/8
SNTB2	NR_172089.1	n.275T>G		non_coding_transcript_exon_variant	1/7
SNTB2	NR_172090.1	n.275T>G		non_coding_transcript_exon_variant	1/6

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
SNTB2	ENST00000336278.9	c.272T>G	p.Leu91Arg	missense_variant	1/7	1	NM_006750.4	P1
SNTB2	ENST00000467311.5	c.272T>G	p.Leu91Arg	missense_variant, NMD_transcript_variant	1/6	1
UTP4	ENST00000567287.2	n.82+20253T>G		intron_variant, non_coding_transcript_variant		3

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome Cov.: 29

GnomAD4 genome Cov.: 31

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Jul 09, 2021

The c.272T>G (p.L91R) alteration is located in exon 1 (coding exon 1) of the SNTB2 gene. This alteration results from a T to G substitution at nucleotide position 272, causing the leucine (L) at amino acid position 91 to be replaced by an arginine (R). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.095
BayesDel_addAF	Benign	-0.26	T
BayesDel_noAF	Benign	-0.61
CADD	Benign	21
DANN	Benign	0.88
DEOGEN2	Benign	0.28	T
Eigen	Benign	-0.55
Eigen_PC	Benign	-0.41
FATHMM_MKL	Benign	0.12	N
LIST_S2	Benign	0.33	T
M_CAP	Uncertain	0.18	D
MetaRNN	Benign	0.10	T
MetaSVM	Benign	-0.98	T
MutationAssessor	Benign	0.69	N
MutationTaster	Benign	0.70	N
PrimateAI	Pathogenic	0.92	D
PROVEAN	Benign	0.20	N
REVEL	Benign	0.026
Sift	Benign	0.55	T
Sift4G	Benign	0.53	T
Polyphen		0.0	B
Vest4		0.24
MutPred		0.34		Gain of methylation at L91 (P = 0.0037);
MVP		0.44
MPC		2.1
ClinPred		0.052	T
GERP RS		2.4
Varity_R		0.085
gMVP		0.42

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

No publications associated with this variant yet.

Other links and lift over

hg19: chr16-69221341;